EXIT
EXIT
TROUBLE DIAGNOSIS - INDEX ....................................8
Alphabetical & P No. Index for DTC ...........................8
PRECAUTIONS .............................................................14
Supplemental Restraint System (SRS) ″AIR
BAG″ and ″SEAT BELT PRE-TENSIONER″.............14
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T.........................................14
Engine Fuel & Emission Control System ..................15
Precautions................................................................16
Wiring Diagrams and Trouble Diagnosis...................17
PREPARATION .............................................................18
Special Service Tools................................................18
Commercial Service Tools.........................................18
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................20
Engine Control Component Parts Location...............20
Circuit Diagram..........................................................24
System Diagram ........................................................26
Vacuum Hose Drawing..............................................27
System Chart.............................................................28
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION...............................................29
Multiport Fuel Injection (MFI) System .......................29
Distributor Ignition (DI) System .................................31
Air Conditioning Cut Control......................................32
Fuel Cut Control (at no load & high engine
speed)........................................................................33
Evaporative Emission System...................................33
Positive Crankcase Ventilation..................................48
BASIC SERVICE PROCEDURE...................................50
Fuel Pressure Release..............................................50
Fuel Pressure Check.................................................50
Fuel Pressure Regulator Check ................................51
Injector.......................................................................51
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment.................................................................53
Idle Air Volume Learning ...........................................65
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION...............................................................67
ENGINE CONTROL SYSTEM
SECTION
CONTENTS
Introduction................................................................67
Two Trip Detection Logic...........................................67
Emission-related Diagnostic Information...................68
Malfunction Indicator Lamp (MIL)..............................81
OBD System Operation Chart...................................83
CONSULT-II...............................................................88
Generic Scan Tool (GST)........................................100
TROUBLE DIAGNOSIS - INTRODUCTION................102
Introduction..............................................................102
Work Flow................................................................104
TROUBLE DIAGNOSIS - BASIC INSPECTION.........106
Basic Inspection.......................................................106
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION.............................................................122
DTC Inspection Priority Chart..................................122
Fail-safe Chart .........................................................123
Symptom Matrix Chart.............................................124
CONSULT-II Reference Value in Data Monitor
Mode........................................................................128
Major Sensor Reference Graph in Data Monitor
Mode........................................................................130
ECM Terminals and Reference Value.....................133
TROUBLE DIAGNOSIS - SPECIFICATION VALUE ..141
Description...............................................................141
Testing Condition.....................................................141
Inspection Procedure...............................................141
Diagnostic Procedure ..............................................142
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................145
Description...............................................................145
Diagnostic Procedure ..............................................145
TROUBLE DIAGNOSIS FOR POWER SUPPLY........146
Main Power Supply and Ground Circuit..................146
DTC P0100 MASS AIR FLOW SENSOR (MAFS)......152
Component Description ...........................................152
CONSULT-II Reference Value in Data Monitor
Mode........................................................................152
ECM Terminals and Reference Value.....................152
On Board Diagnosis Logic.......................................153
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DTC Confirmation Procedure..................................153
Overall Function Check...........................................155
Wiring Diagram........................................................156
Diagnostic Procedure ..............................................157
Component Inspection.............................................160
DTC P0105 ABSOLUTE PRESSURE SENSOR........161
Component Description ...........................................161
On Board Diagnosis Logic.......................................161
DTC Confirmation Procedure..................................161
Wiring Diagram........................................................162
Diagnostic Procedure ..............................................163
DTC P0110 INTAKE AIR TEMPERATURE
SENSOR ......................................................................166
Component Description ...........................................166
On Board Diagnosis Logic.......................................166
DTC Confirmation Procedure..................................166
Wiring Diagram........................................................168
Diagnostic Procedure ..............................................169
Component Inspection.............................................171
DTC P0115 ENGINE COOLANT TEMPERATURE
SENSOR (ECTS) (CIRCUIT).......................................172
Component Description ...........................................172
CONSULT-II Reference Value in Data Monitor
Mode........................................................................172
On Board Diagnosis Logic.......................................172
DTC Confirmation Procedure..................................173
Wiring Diagram........................................................174
Diagnostic Procedure ..............................................175
Component Inspection.............................................177
DTC P0120 THROTTLE POSITION SENSOR ...........178
Component Description ...........................................178
CONSULT-II Reference Value in Data Monitor
Mode........................................................................178
ECM Terminals and Reference Value.....................179
On Board Diagnosis Logic.......................................179
DTC Confirmation Procedure..................................180
Wiring Diagram........................................................184
Diagnostic Procedure ..............................................185
Component Inspection.............................................189
DTC P0125 ENGINE COOLANT TEMPERATURE
(ECT) SENSOR............................................................191
Component Description ...........................................191
CONSULT-II Reference Value in Data Monitor
Mode........................................................................191
On Board Diagnosis Logic.......................................191
DTC Confirmation Procedure..................................192
Wiring Diagram........................................................193
Diagnostic Procedure ..............................................194
Component Inspection.............................................196
DTC P0130 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (CIRCUIT)..........................................197
Component Description ...........................................197
CONSULT-II Reference Value in Data Monitor
Mode........................................................................197
ECM Terminals and Reference Value.....................197
On Board Diagnosis Logic.......................................198
DTC Confirmation Procedure..................................198
Overall Function Check...........................................199
Wiring Diagram........................................................200
Diagnostic Procedure ..............................................201
Component Inspection.............................................203
DTC P0131 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (LEAN SHIFT MONITORING)..........205
Component Description ...........................................205
CONSULT-II Reference Value in Data Monitor
Mode........................................................................205
ECM Terminals and Reference Value.....................205
On Board Diagnosis Logic.......................................206
DTC Confirmation Procedure..................................206
Overall Function Check...........................................207
Diagnostic Procedure ..............................................207
Component Inspection.............................................209
DTC P0132 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (RICH SHIFT MONITORING)...........211
Component Description ...........................................211
CONSULT-II Reference Value in Data Monitor
Mode........................................................................211
ECM Terminals and Reference Value.....................211
On Board Diagnosis Logic.......................................212
DTC Confirmation Procedure..................................212
Overall Function Check...........................................213
Diagnostic Procedure ..............................................214
Component Inspection.............................................216
DTC P0133 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (RESPONSE MONITORING)............218
Component Description ...........................................218
CONSULT-II Reference Value in Data Monitor
Mode........................................................................218
ECM Terminals and Reference Value.....................218
On Board Diagnosis Logic.......................................219
DTC Confirmation Procedure..................................219
Overall Function Check...........................................220
Wiring Diagram........................................................221
Diagnostic Procedure ..............................................222
Component Inspection.............................................225
DTC P0134 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (HIGH VOLTAGE).............................227
Component Description ...........................................227
CONSULT-II Reference Value in Data Monitor
Mode........................................................................227
ECM Terminals and Reference Value.....................227
On Board Diagnosis Logic.......................................228
DTC Confirmation Procedure..................................228
Wiring Diagram........................................................229
EC-2
CONTENTS (Cont’d)
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Diagnostic Procedure ..............................................230
Component Inspection.............................................231
DTC P0135 FRONT HEATED OXYGEN SENSOR
HEATER.......................................................................233
Description...............................................................233
CONSULT-II Reference Value in Data Monitor
Mode........................................................................233
ECM Terminals and Reference Value.....................233
On Board Diagnosis Logic.......................................233
DTC Confirmation Procedure..................................234
Wiring Diagram........................................................235
Diagnostic Procedure ..............................................236
Component Inspection.............................................237
DTC P0137 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (MIN. VOLTAGE MONITORING)........238
Component Description ...........................................238
CONSULT-II Reference Value in Data Monitor
Mode........................................................................238
ECM Terminals and Reference Value.....................238
On Board Diagnosis Logic.......................................238
DTC Confirmation Procedure..................................239
Overall Function Check...........................................239
Wiring Diagram........................................................240
Diagnostic Procedure ..............................................241
Component Inspection.............................................244
DTC P0138 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (MAX. VOLTAGE MONITORING) ......246
Component Description ...........................................246
CONSULT-II Reference Value in Data Monitor
Mode........................................................................246
ECM Terminals and Reference Value.....................246
On Board Diagnosis Logic.......................................246
DTC Confirmation Procedure..................................247
Overall Function Check...........................................247
Wiring Diagram........................................................248
Diagnostic Procedure ..............................................249
Component Inspection.............................................252
DTC P0139 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (RESPONSE MONITORING)..............254
Component Description ...........................................254
CONSULT-II Reference Value in Data Monitor
Mode........................................................................254
ECM Terminals and Reference Value.....................254
On Board Diagnosis Logic.......................................254
DTC Confirmation Procedure..................................255
Overall Function Check...........................................255
Wiring Diagram........................................................256
Diagnostic Procedure ..............................................257
Component Inspection.............................................260
DTC P0140 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (HIGH VOLTAGE)...............................262
Component Description ...........................................262
CONSULT-II Reference Value in Data Monitor
Mode........................................................................262
ECM Terminals and Reference Value.....................262
On Board Diagnosis Logic.......................................262
DTC Confirmation Procedure..................................263
Overall Function Check...........................................263
Wiring Diagram........................................................264
Diagnostic Procedure ..............................................265
Component Inspection.............................................266
DTC P0141 REAR HEATED OXYGEN SENSOR
HEATER.......................................................................268
Description...............................................................268
CONSULT-II Reference Value in Data Monitor
Mode........................................................................268
ECM Terminals and Reference Value.....................268
On Board Diagnosis Logic.......................................268
DTC Confirmation Procedure..................................269
Wiring Diagram........................................................270
Diagnostic Procedure ..............................................271
Component Inspection.............................................272
DTC P0171 FUEL INJECTION SYSTEM
FUNCTION (LEAN SIDE)............................................273
On Board Diagnosis Logic.......................................273
DTC Confirmation Procedure..................................273
Wiring Diagram........................................................275
Diagnostic Procedure ..............................................276
DTC P0172 FUEL INJECTION SYSTEM
FUNCTION (RICH SIDE).............................................280
On Board Diagnosis Logic.......................................280
DTC Confirmation Procedure..................................280
Wiring Diagram........................................................282
Diagnostic Procedure ..............................................283
DTC P0180 FUEL TANK TEMPERATURE
SENSOR ......................................................................287
Component Description ...........................................287
On Board Diagnosis Logic.......................................287
DTC Confirmation Procedure..................................287
Wiring Diagram........................................................289
Diagnostic Procedure ..............................................290
Component Inspection.............................................291
DTC P0217 COOLANT OVERTEMPERATURE
ENRICHMENT PROTECTION.....................................292
System Description..................................................292
CONSULT-II Reference Value in Data Monitor
Mode........................................................................292
ECM Terminals and Reference Value.....................293
On Board Diagnosis Logic.......................................293
Possible Cause........................................................293
Overall Function Check...........................................294
Wiring Diagram........................................................297
Diagnostic Procedure ..............................................298
Main 12 Causes of Overheating..............................309
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EC-3
CONTENTS (Cont’d)
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DTC P0300 - P0304 NO.4-1CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE ...............310
On Board Diagnosis Logic.......................................310
DTC Confirmation Procedure..................................310
Diagnostic Procedure ..............................................311
Component Inspection.............................................316
DTC P0325 KNOCK SENSOR (KS)...........................317
Component Description ...........................................317
ECM Terminals and Reference Value.....................317
On Board Diagnosis Logic.......................................317
DTC Confirmation Procedure..................................317
Wiring Diagram........................................................318
Diagnostic Procedure ..............................................319
Component Inspection.............................................320
DTC P0335 CRANKSHAFT POSITION SENSOR
(CKPS) (OBD)..............................................................321
Component Description ...........................................321
ECM Terminals and Reference Value.....................321
On Board Diagnosis Logic.......................................321
DTC Confirmation Procedure..................................322
Wiring Diagram........................................................323
Diagnostic Procedure ..............................................324
Component Inspection.............................................326
DTC P0340 CAMSHAFT POSITION SENSOR
(CMPS).........................................................................327
Component Description ...........................................327
ECM Terminals and Reference Value.....................327
On Board Diagnosis Logic.......................................328
DTC Confirmation Procedure..................................328
Wiring Diagram........................................................330
Diagnostic Procedure ..............................................331
Component Inspection.............................................334
DTC P0400 EGR FUNCTION (CLOSE)......................335
Description...............................................................335
CONSULT-II Reference Value in Data Monitor
Mode........................................................................336
ECM Terminals and Reference Value.....................336
On Board Diagnosis Logic.......................................336
Possible Cause........................................................337
DTC Confirmation Procedure..................................337
Wiring Diagram........................................................339
Diagnostic Procedure ..............................................340
DTC P0403 EGR VOLUME CONTROL VALVE
(CIRCUIT).....................................................................345
Description...............................................................345
CONSULT-II Reference Value in Data Monitor
Mode........................................................................346
ECM Terminals and Reference Value.....................346
On Board Diagnosis Logic.......................................346
Possible Cause........................................................347
DTC Confirmation Procedure..................................347
Wiring Diagram........................................................348
Diagnostic Procedure ..............................................349
DTC P0420 THREE WAY CATALYST FUNCTION ...352
On Board Diagnosis Logic.......................................352
DTC Confirmation Procedure..................................352
Overall Function Check...........................................353
Diagnostic Procedure ..............................................353
DTC P0440 EVAP CONTROL SYSTEM (SMALL
LEAK) (NEGATIVE PRESSURE)................................356
On Board Diagnosis Logic.......................................356
Possible Cause........................................................356
DTC Confirmation Procedure..................................357
Diagnostic Procedure ..............................................358
DTC P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE (CIRCUIT).................370
Description...............................................................370
CONSULT-II Reference Value in Data Monitor
Mode........................................................................370
ECM Terminals and Reference Value.....................371
On Board Diagnosis Logic.......................................371
Possible Cause........................................................371
DTC Confirmation Procedure..................................372
Wiring Diagram........................................................373
Diagnostic Procedure ..............................................374
DTC P0446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CIRCUIT) ......377
Component Description ...........................................377
CONSULT-II Reference Value in Data Monitor
Mode........................................................................377
ECM Terminals and Reference Value.....................377
On Board Diagnosis Logic.......................................377
Possible Cause........................................................378
DTC Confirmation Procedure..................................378
Wiring Diagram........................................................379
Diagnostic Procedure ..............................................380
DTC P0450 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PRESSURE SENSOR ..............384
Component Description ...........................................384
CONSULT-II Reference Value in Data Monitor
Mode........................................................................384
ECM Terminals and Reference Value.....................384
On Board Diagnosis Logic.......................................385
Possible Cause........................................................385
DTC Confirmation Procedure..................................385
Wiring Diagram........................................................387
Diagnostic Procedure ..............................................388
DTC P0455 EVAP CONTROL SYSTEM (GROSS
LEAK)...........................................................................397
On Board Diagnosis Logic.......................................397
Possible Cause........................................................397
DTC Confirmation Procedure..................................398
Diagnostic Procedure ..............................................399
EC-4
CONTENTS (Cont’d)
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DTC P0460 FUEL LEVEL SENSOR FUNCTION
(SLOSH).......................................................................409
Component Description ...........................................409
ECM Terminals and Reference Value.....................409
On Board Diagnostic Logic......................................409
Possible Cause........................................................409
DTC Confirmation Procedure..................................410
Wiring Diagram........................................................411
Diagnostic Procedure ..............................................412
DTC P0461 FUEL LEVEL SENSOR FUNCTION.......414
Component Description ...........................................414
On Board Diagnostic Logic......................................414
Possible Cause........................................................414
Overall Function Check...........................................414
DTC P0464 FUEL LEVEL SENSOR CIRCUIT...........416
Component Description ...........................................416
ECM Terminals and Reference Value.....................416
On Board Diagnostic Logic......................................416
Possible Cause........................................................416
DTC Confirmation Procedure..................................417
Wiring Diagram........................................................418
Diagnostic Procedure ..............................................419
DTC P0500 VEHICLE SPEED SENSOR (VSS) .........421
Component Description ...........................................421
ECM Terminals and Reference Value.....................421
On Board Diagnosis Logic.......................................421
DTC Confirmation Procedure..................................421
Overall Function Check...........................................422
Wiring Diagram........................................................423
Diagnostic Procedure ..............................................424
DTC P0505 IDLE AIR CONTROL VALVE (IACV) -
AUXILIARY AIR CONTROL (AAC) VALVE ...............425
Description...............................................................425
CONSULT-II Reference Value in Data Monitor
Mode........................................................................426
ECM Terminals and Reference Value.....................426
On Board Diagnosis Logic.......................................426
DTC Confirmation Procedure..................................426
Wiring Diagram........................................................428
Diagnostic Procedure ..............................................429
DTC P0510 CLOSED THROTTLE POSITION
SWITCH .......................................................................434
Component Description ...........................................434
CONSULT-II Reference Value in Data Monitor
Mode........................................................................434
ECM Terminals and Reference Value.....................434
On Board Diagnosis Logic.......................................434
DTC Confirmation Procedure..................................435
Overall Function Check...........................................435
Wiring Diagram........................................................436
Diagnostic Procedure ..............................................437
DTC P0600 A/T CONTROL.........................................442
System Description..................................................442
ECM Terminals and Reference Value.....................442
On Board Diagnosis Logic.......................................442
DTC Confirmation Procedure..................................442
Wiring Diagram........................................................443
Diagnostic Procedure ..............................................444
DTC P0605 ECM .........................................................445
Component Description ...........................................445
On Board Diagnosis Logic.......................................445
DTC Confirmation Procedure..................................445
Diagnostic Procedure ..............................................446
DTC P1126 THERMOSTAT FUNCTION.....................447
On Board Diagnosis Logic.......................................447
Possible Cause........................................................447
DTC Confirmation Procedure..................................447
Diagnostic Procedure ..............................................448
DTC P1148 CLOSED LOOP CONTROL ....................449
On Board Diagnosis Logic.......................................449
DTC Confirmation Procedure..................................449
Overall Function Check...........................................450
Diagnostic Procedure ..............................................450
DTC P1217 ENGINE OVER TEMPERATURE
(OVERHEAT)...............................................................451
System Description..................................................451
CONSULT-II Reference Value in Data Monitor
Mode........................................................................451
ECM Terminals and Reference Value.....................452
On Board Diagnosis Logic.......................................452
Overall Function Check...........................................453
Wiring Diagram........................................................454
Diagnostic Procedure ..............................................455
Main 12 Causes of Overheating..............................467
Component Inspection.............................................467
DTC P1320 IGNITION SIGNAL...................................469
Component Description ...........................................469
CONSULT-II Reference Value in Data Monitor
Mode........................................................................469
ECM Terminals and Reference Value.....................469
On Board Diagnosis Logic.......................................470
DTC Confirmation Procedure..................................470
Wiring Diagram........................................................471
Diagnostic Procedure ..............................................472
Component Inspection.............................................475
DTC P1336 CRANKSHAFT POSITION SENSOR
(CKPS) (OBD) (COG)..................................................476
Component Description ...........................................476
ECM Terminals and Reference Value.....................476
On Board Diagnosis Logic.......................................476
DTC Confirmation Procedure..................................477
Wiring Diagram........................................................478
Diagnostic Procedure ..............................................479
Component Inspection.............................................481
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EC-5
CONTENTS (Cont’d)
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DTC P1401 EGR TEMPERATURE SENSOR.............482
Component Description ...........................................482
On Board Diagnosis Logic.......................................482
Possible Cause........................................................482
DTC Confirmation Procedure..................................483
Wiring Diagram........................................................485
Diagnostic Procedure ..............................................486
DTC P1402 EGR FUNCTION (OPEN)........................490
Description...............................................................490
CONSULT-II Reference Value in Data Monitor
Mode........................................................................491
ECM Terminals and Reference Value.....................491
On Board Diagnosis Logic.......................................491
Possible Cause........................................................492
DTC Confirmation Procedure..................................492
Wiring Diagram........................................................494
Diagnostic Procedure ..............................................495
DTC P1440 EVAP CONTROL SYSTEM (SMALL
LEAK) (POSITIVE PRESSURE) .................................500
On Board Diagnosis Logic.......................................500
Possible Cause........................................................500
DTC Confirmation Procedure..................................501
Diagnostic Procedure ..............................................501
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE...................................502
Description...............................................................502
CONSULT-II Reference Value in Data Monitor
Mode........................................................................502
ECM Terminals and Reference Value.....................503
On Board Diagnosis Logic.......................................503
Possible Cause........................................................503
DTC Confirmation Procedure..................................504
Wiring Diagram........................................................505
Diagnostic Procedure ..............................................506
DTC P1446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CLOSE).........514
Component Description ...........................................514
CONSULT-II Reference Value in Data Monitor
Mode........................................................................514
ECM Terminals and Reference Value.....................514
On Board Diagnosis Logic.......................................514
Possible Cause........................................................515
DTC Confirmation Procedure..................................515
Wiring Diagram........................................................516
Diagnostic Procedure ..............................................517
DTC P1447 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PURGE FLOW
MONITORING..............................................................522
System Description..................................................522
On Board Diagnosis Logic.......................................522
Possible Cause........................................................522
DTC Confirmation Procedure..................................523
Overall Function Check...........................................523
Diagnostic Procedure ..............................................525
DTC P1448 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (OPEN)...........534
Component Description ...........................................534
CONSULT-II Reference Value in Data Monitor
Mode........................................................................534
ECM Terminals and Reference Value.....................534
On Board Diagnosis Logic.......................................534
Possible Cause........................................................535
DTC Confirmation Procedure..................................535
Overall Function Check...........................................536
Wiring Diagram........................................................537
Diagnostic Procedure ..............................................538
DTC P1464 FUEL LEVEL SENSOR CIRCUIT
(GROUND SIGNAL) ....................................................543
Component Description ...........................................543
ECM Terminals and Reference Value.....................543
On Board Diagnostic Logic......................................543
Possible Cause........................................................543
DTC Confirmation Procedure..................................544
Wiring Diagram........................................................545
Diagnostic Procedure ..............................................546
DTC P1490 VACUUM CUT VALVE BYPASS
VALVE (CIRCUIT)........................................................547
Description...............................................................547
CONSULT-II Reference Value in Data Monitor
Mode........................................................................547
ECM Terminals and Reference Value.....................547
On Board Diagnosis Logic.......................................548
Possible Cause........................................................548
DTC Confirmation Procedure..................................548
Wiring Diagram........................................................549
Diagnostic Procedure ..............................................550
DTC P1491 VACUUM CUT VALVE BYPASS
VALVE..........................................................................553
Description...............................................................553
CONSULT-II Reference Value in Data Monitor
Mode........................................................................553
ECM Terminals and Reference Value.....................553
On Board Diagnosis Logic.......................................554
Possible Cause........................................................554
DTC Confirmation Procedure..................................554
Overall Function Check...........................................555
Wiring Diagram........................................................556
Diagnostic Procedure ..............................................557
DTC P1605 A/T DIAGNOSIS COMMUNICATION
LINE .............................................................................565
System Description..................................................565
ECM Terminals and Reference Value.....................565
On Board Diagnosis Logic.......................................565
DTC Confirmation Procedure..................................565
EC-6
CONTENTS (Cont’d)
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EXIT
Wiring Diagram........................................................566
Diagnostic Procedure ..............................................567
DTC P1706 PARK/NEUTRAL POSITION (PNP)
SWITCH .......................................................................568
Component Description ...........................................568
CONSULT-II Reference Value in Data Monitor
Mode........................................................................568
ECM Terminals and Reference Value.....................568
On Board Diagnosis Logic.......................................568
DTC Confirmation Procedure..................................568
Overall Function Check...........................................569
Wiring Diagram........................................................570
Diagnostic Procedure For M/T Models....................571
Diagnostic Procedure For A/T Models ....................573
INJECTOR ...................................................................575
Component Description ...........................................575
CONSULT-II Reference Value in Data Monitor
Mode........................................................................575
ECM Terminals and Reference Value.....................575
Wiring Diagram........................................................576
Diagnostic Procedure ..............................................577
START SIGNAL...........................................................580
CONSULT-II Reference Value in Data Monitor
Mode........................................................................580
ECM Terminals and Reference Value.....................580
Wiring Diagram........................................................581
Diagnostic Procedure ..............................................582
FUEL PUMP.................................................................584
System Description..................................................584
Component Description ...........................................584
CONSULT-II Reference Value in Data Monitor
Mode........................................................................584
ECM Terminals and Reference Value.....................584
Wiring Diagram........................................................586
Diagnostic Procedure ..............................................587
Component Inspection.............................................592
POWER STEERING OIL PRESSURE SWITCH.........593
Component Description ...........................................593
CONSULT-II Reference Value in Data Monitor
Mode........................................................................593
ECM Terminals and Reference Value.....................593
Wiring Diagram........................................................594
Diagnostic Procedure ..............................................595
Component Inspection.............................................597
REFRIGERANT PRESSURE SENSOR......................598
Description...............................................................598
ECM Terminals and Reference Value.....................598
Wiring Diagram........................................................599
Diagnostic Procedure ..............................................600
ELECTRICAL LOAD SIGNAL.....................................603
CONSULT-II Reference Value in Data Monitor
Mode........................................................................603
ECM Terminals and Reference Value.....................603
Wiring Diagram........................................................604
Diagnostic Procedure ..............................................606
MIL & DATA LINK CONNECTORS............................610
Wiring Diagram........................................................610
SERVICE DATA AND SPECIFICATIONS (SDS).......611
Fuel Pressure Regulator..........................................611
Idle Speed and Ignition Timing................................611
Ignition Coil..............................................................611
Mass Air Flow Sensor..............................................611
Engine Coolant Temperature Sensor......................611
EGR Temperature Sensor .......................................611
Fuel Pump ...............................................................611
IACV-AAC Valve......................................................611
Injector.....................................................................612
Resistor....................................................................612
Throttle Position Sensor..........................................612
Front Heated Oxygen Sensor Heater......................612
Calculated Load Value.............................................612
Intake Air Temperature Sensor................................612
EVAP Canister Purge Volume Control Valve ..........612
Rear Heated Oxygen Sensor Heater......................612
Crankshaft Position Sensor (OBD)..........................612
Fuel Tank Temperature Sensor ...............................612
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Alphabetical & P No. Index for DTC
TROUBLE DIAGNOSIS — INDEX
EXIT
EXIT
Alphabetical & P No. Index for DTC
ALPHABETICAL INDEX FOR DTC
Items
(CONSULT-II screen terms)
Unable to access ECM — EC-123
ABSL PRES SEN/CIRC P0105 EC-161
AIR TEMP SEN/CIRC P0110 EC-166
A/T 1ST GR FNCTN P0731 AT-125
A/T 2ND GR FNCTN P0732 AT-132
A/T 3RD GR FNCTN P0733 AT-138
A/T 4TH GR FNCTN P0734 AT-144
A/T COMM LINE P0600*2 EC-442
A/T DIAG COMM LINE P1605 EC-565
A/T TCC S/V FNCTN P0744 AT-160
ATF TEMP SEN/CIRC P0710 AT-110
CAM POS SEN/CIRC P0340 EC-327
CLOSED LOOP-B1 P1148 EC-449
DTC*1 Reference page
NCEC0001
NCEC0001S01
CLOSED TP SW/CIRC P0510 EC-434
COOLANT T SEN/CIRC*3 P0115 EC-172
*COOLAN T SEN/CIRC P0125 EC-191
CPS/CIRC (OBD) COG P1336 EC-476
CPS/CIRCUIT (OBD) P0335 EC-321
CYL 1 MISFIRE P0301 EC-310
CYL 2 MISFIRE P0302 EC-310
CYL 3 MISFIRE P0303 EC-310
CYL 4 MISFIRE P0304 EC-310
ECM P0605 EC-445
EGR SYSTEM P0400 EC-335
EGR SYSTEM P1402 EC-490
EGR TEMP SEN/CIRC P1401 EC-482
EGR VOL CONT/V CIR P0403 EC-345
ENGINE SPEED SIG P0725 AT-121
ENG OVER TEMP P0217 EC-292
ENG OVER TEMP P1217*2 EC-451
EVAP GROSS LEAK P0455 EC-397
EVAP PURG FLOW/MON P1447 EC-522
EVAP SYS PRES SEN P0450 EC-384
EVAP SMALL LEAK P0440 EC-356
EVAP SMALL LEAK P1440 EC-500
EC-8
TROUBLE DIAGNOSIS — INDEX
Alphabetical & P No. Index for DTC (Cont’d)
EXIT
EXIT
Items
(CONSULT-II screen terms)
FR O2 SE HEATER-B1 P0135 EC-233
FRONT O2 SENSOR-B1 P0130 EC-197
FRONT O2 SENSOR-B1 P0131 EC-205
FRONT O2 SENSOR-B1 P0132 EC-211
FRONT O2 SENSOR-B1 P0133 EC-218
FRONT O2 SENSOR-B1 P0134 EC-227
FUEL LEVL SEN/CIRC P0464 EC-416
FUEL LEVL SEN/CIRC P1464 EC-543
FUEL LEVEL SENSOR P0461 EC-414
FUEL LV SE (SLOSH) P0460 EC-409
FUEL SYS-LEAN/BK1 P0171 EC-273
FUEL SYS-RICH/BK1 P0172 EC-280
FUEL TEMP SEN/CIRC P0180 EC-287
IACV/AAC VLV/CIRC P0505 EC-425
IGN SIGNAL-PRIMARY P1320 EC-469
KNOCK SEN/CIRC-B1 P0325*2 EC-317
DTC*1 Reference page
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L/PRES SOL/CIRC P0745 AT-171
MAF SEN/CIRCUIT*3 P0100 EC-152
MULTI CYL MISFIRE P0300 EC-310
NATS MALFUNCTION P1610 - P1615*2 EL-248
NO DTC IS DETECTED. FURTHER TESTING MAY BE
REQUIRED.
O/R CLTCH SOL/CIRC P1760 AT-199
P-N POS SW/CIRCUIT P1706 EC-568
PNP SW/CIRC P0705 AT-104
PURG VOLUME CONT/V P0443 EC-370
PURG VOLUME CONT/V P1444 EC-502
REAR O2 SENSOR-B1 P0137 EC-238
REAR O2 SENSOR-B1 P0138 EC-246
REAR O2 SENSOR-B1 P0139 EC-254
REAR O2 SENSOR-B1 P0140 EC-262
RR O2 SE HEATER-B1 P0141 EC-268
SFT SOL A/CIRC*3 P0750 AT-178
SFT SOL B/CIRC*3 P0755 AT-184
P0000 —
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TCC SOLENOID/CIRC P0740 AT-154
THERMOSTAT FNCTN P1126 EC-447
TP SEN/CIRC A/T*3 P1705 AT-190
TRTL POS SEN/CIRC*3 P0120 EC-178
EC-9
IDX
TROUBLE DIAGNOSIS — INDEX
Alphabetical & P No. Index for DTC (Cont’d)
EXIT
EXIT
Items
(CONSULT-II screen terms)
TW CATALYST SYS-B1 P0420 EC-352
VC CUT/V BYPASS/V P1491 EC-553
VC/V BYPASS/V P1490 EC-547
VEH SPEED SEN/CIRC*4 P0500 EC-421
VEH SPD SEN/CIR A/T*4 P0720 AT-116
VENT CONTROL VALVE P0446 EC-377
VENT CONTROL VALVE P1446 EC-514
VENT CONTROL VALVE P1448 EC-534
*1: 1st trip DTC No. is the same as DTC No.
*2: This DTC is displayed with CONSULT-II only.
*3: When the fail-safe operation occurs, the MIL illuminates.
*4: The MIL illuminates when both the “Revolution sensor signal” and the “Vehicle speed sensor signal” meet the fail-safe condition at
the same time.
DTC*1 Reference page
EC-10
TROUBLE DIAGNOSIS — INDEX
Alphabetical & P No. Index for DTC (Cont’d)
EXIT
EXIT
P NO. INDEX FOR DTC
DTC*1
— Unable to access ECM EC-123
P0000
P0100 MAF SEN/CIRCUIT*3 EC-152
P0105 ABSL PRES SEN/CIRC EC-161
P0110 AIR TEMP SEN/CIRC EC-166
P0115 COOLANT T SEN/CIRC*3 EC-172
P0120 THRTL POS SEN/CIRC*3 EC-178
P0125 *COOLAN T SEN/CIRC EC-191
P0130 FRONT O2 SENSOR-B1 EC-197
P0131 FRONT O2 SENSOR-B1 EC-205
P0132 FRONT O2 SENSOR-B1 EC-211
P0133 FRONT O2 SENSOR-B1 EC-218
P0134 FRONT O2 SENSOR-B1 EC-227
P0135 FR O2 SE HEATER-B1 EC-233
P0137 REAR O2 SENSOR-B1 EC-238
Items
(CONSULT-II screen terms)
NO DTC IS DETECTED. FURTHER TESTING MAY BE
REQUIRED.
Reference page
—
=NCEC0001S02
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P0138 REAR O2 SENSOR-B1 EC-246
P0139 REAR O2 SENSOR-B1 EC-254
P0140 REAR O2 SENSOR-B1 EC-262
P0141 RR O2 SE HEATER-B1 EC-268
P0171 FUEL SYS-LEAN/BK1 EC-273
P0172 FUEL SYS-RICH/BK1 EC-280
P0180 FUEL TEMP SEN/CIRC EC-287
P0217 ENG OVER TEMP EC-292
P0300 MULTI CYL MISFIRE EC-310
P0301 CYL 1 MISFIRE EC-310
P0302 CYL 2 MISFIRE EC-310
P0303 CYL 3 MISFIRE EC-310
P0304 CYL 4 MISFIRE EC-310
P0325*2 KNOCK SEN/CIRC-B1 EC-317
P0335 CPS/CIRCUIT (OBD) EC-321
P0340 CAM POS SEN/CIRC EC-327
P0400 EGR SYSTEM EC-335
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P0403 EGR VOL CONT/V CIR EC-345
P0420 TW CATALYST SYS-B1 EC-352
P0440 EVAP SMALL LEAK EC-356
P0443 PURG VOLUME CONT/V EC-370
EC-11
IDX
TROUBLE DIAGNOSIS — INDEX
Alphabetical & P No. Index for DTC (Cont’d)
EXIT
EXIT
DTC*1
P0446 VENT CONTROL VALVE EC-377
P0450 EVAP SYS PRES SEN EC-384
P0455 EVAP GROSS LEAK EC-397
P0460 FUEL LV SE (SLOSH) EC-409
P0461 FUEL LEVEL SENSOR EC-414
P0464 FUEL LEVL SEN/CIRC EC-416
P0500 VEH SPEED SEN/CIRC*4 EC-421
P0505 IACV/AAC VLV/CIRC EC-425
P0510 CLOSED TP SW/CIRC EC-434
P0600*2 A/T COMM LINE EC-442
P0605 ECM EC-445
P0705 PNP SW/CIRC AT-104
P0710 ATF TEMP SEN/CIRC AT-110
P0720 VEH SPD SEN/CIR A/T*4 AT-116
P0725 ENGINE SPEED SIG AT-121
(CONSULT-II screen terms)
Items
Reference page
P0731 A/T 1ST GR FNCTN AT-125
P0732 A/T 2ND GR FNCTN AT-132
P0733 A/T 3RD GR FNCTN AT-138
P0734 A/T 4TH GR FNCTN AT-144
P0740 TCC SOLENOID/CIRC AT-154
P0744 A/T TCC S/V FNCTN AT-160
P0745 L/PRESS SOL/CIRC AT-171
P0750 SFT SOL A/CIRC*3 AT-178
P0755 SFT SOL B/CIRC*3 AT-184
P1126 THERMOSTAT FNCTN EC-447
P1148 CLOSED LOOP-B1 EC-449
P1217*2 ENG OVER TEMP EC-451
P1320 IGN SIGNAL-PRIMARY EC-469
P1336 CPS/CIRC (OBD) COG EC-476
P1401 EGR TEMP SEN/CIRC EC-482
P1402 EGR SYSTEM EC-490
P1440 EVAP SMALL LEAK EC-500
P1444 PURG VOLUME CONT/V EC-502
P1446 VENT CONTROL VALVE EC-514
P1447 EVAP PURG FLOW/MON EC-522
P1448 VENT CONTROL VALVE EC-534
P1464 FUEL LEVL SEN/CIRC EC-543
EC-12
TROUBLE DIAGNOSIS — INDEX
Alphabetical & P No. Index for DTC (Cont’d)
EXIT
EXIT
DTC*1
P1490 VC/V BYPASS/V EC-547
P1491 VC CUT/V BYPASS/V EC-553
P1605 A/T DIAG COMM LINE EC-565
P1610 - P1615*2 NATS MALFUNCTION EL-248
P1705 TP SEN/CIRC A/T*3 AT-190
P1706 P-N POS SW/CIRCUIT EC-568
P1760 O/R CLTCH SOL/CIRC AT-199
*1: 1st trip DTC No. is the same as DTC No.
*2: This DTC is displayed with CONSULT-II only.
*3: When the fail-safe operation occurs, the MIL illuminates.
*4: The MIL illuminates when both the “Revolution sensor signal” and the “Vehicle speed sensor signal” meet the fail-safe condition at
the same time.
(CONSULT-II screen terms)
Items
Reference page
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EC-13
IDX
PRECAUTIONS
Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER”
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to INFINITI G20 is as follows:
I For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steering wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
I For a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat),
satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness,
warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in the RS section of this Service Manual.
WARNING:
I To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be performed
by an authorized INFINITI dealer.
I Improper maintenance, unincluding incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by intentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the RS section.
I Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses (except “SEAT BELT PRE-TENSIONER”) covered with yellow insulation tape either just before the harness connectors or for the complete harness are related to the SRS.
NCEC0002
EXIT
EXIT
Precautions for On Board Diagnostic (OBD) System of Engine and A/T
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
I Be sure to turn the ignition switch “OFF” and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MIL to light up.
I Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
I Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector.
For description and how to disconnect, refer to EL section, “Description”, “HARNESS CONNECTOR”.
I Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MIL to light up due to the short circuit.
I Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the EGR system or fuel injection system,
etc.
I Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission Control Module) before returning the vehicle to the customer.
NCEC0003
EC-14
PRECAUTIONS
Engine Fuel & Emission Control System
EXIT
EXIT
Engine Fuel & Emission Control System
NCEC0004
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EC-15
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SEF331WC
Precautions
PRECAUTIONS
EXIT
EXIT
SEF289H
SEF908W
Precautions
NCEC0005
I Before connecting or disconnecting the ECM harness
connector, turn ignition switch OFF and disconnect negative battery terminal. Failure to do so may damage the
ECM because battery voltage is applied to ECM even if
ignition switch is turned off.
I When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown at left.
I When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminals when connecting pin connectors.
SEF291H
I Before replacing ECM, perform Terminals and Reference
Value inspection and make sure ECM functions properly.
Refer to EC-133.
MEF040D
I After performing each TROUBLE DIAGNOSIS, perform
“Overall Function Check” or “DTC Confirmation Procedure”.
The DTC should not be displayed in the “DTC Confirmation Procedure” if the repair is completed. The “Overall
Function Check” should be a good result if the repair is
completed.
SEF217U
EC-16
PRECAUTIONS
Precautions (Cont’d)
I When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
I Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals,
such as the ground.
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SEF348N
Wiring Diagrams and Trouble Diagnosis
When you read Wiring diagrams, refer to the following:
I GI-11, “HOW TO READ WIRING DIAGRAMS”
I EL-9, “POWER SUPPLY ROUTING” for power distribution cir-
cuit
When you perform trouble diagnosis, refer to the following:
I GI-36, “HOW TO FOLLOWTEST GROUP INTROUBLE DIAG-
NOSIS”
I GI-25,“HOW TO PERFORM EFFICIENTDIAGNOSIS FORAN
ELECTRICAL INCIDENT”
NCEC0006
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EC-17
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IDX
Special Service Tools
PREPARATION
EXIT
EXIT
Special Service Tools
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
KV10117100
(J36471-A)
Heated oxygen sensor
wrench
KV10114400
(J-38365)
Heated oxygen sensor
wrench
Description
Loosening or tightening front heated oxygen sensor with 22 mm (0.87 in) hexagon nut
NT379
Loosening or tightening rear heated oxygen sensor
a: 22 mm (0.87 in)
NT636
Commercial Service Tools
Tool name Description
NCEC0007
NCEC0008
Fuel filler cap adapter
Leak detector
(J41416)
EVAP service port
adapter
(J41413-OBD)
Checking fuel tank vacuum relief valve opening
pressure
NT653
Locating the EVAP leak
NT703
Applying positive pressure through EVAP service
port
NT704
EC-18
Tool name Description
PREPARATION
Commercial Service Tools (Cont’d)
EXIT
EXIT
Hose clipper
Oxygen sensor thread
cleaner
(J-43897-18)
(J-43897-12)
Anti-seize lubricant
(Permatex
equivalent meeting MIL
specification MIL-A-907)
TM
133AR or
NT720
NT778
Clamping the EVAP purge hose between the fuel
tank and EVAP canister applied to DTC P1440
[EVAP control system (Small leak — Positive pressure)]
Reconditioning the exhaust system threads before
installing a new oxygen sensor. Use with anti-seize
lubricant shown below.
a: J-43897-18 (18 mm diameter with pitch 1.5
mm) for Zirconia Oxygen Sensor
b: J-43897-12 (12 mm diameter with pitch 1.25
mm) for Titania Oxygen Sensor
Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads.
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NT779
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EC-19
IDX
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location
EXIT
EXIT
Engine Control Component Parts Location
NCEC0009
SEF824X
EC-20
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location (Cont’d)
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EC-21
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IDX
SEF835X
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location (Cont’d)
EXIT
EXIT
SEF836X
EC-22
NOTE:
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location (Cont’d)
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EC-23
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IDX
Circuit Diagram
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
EXIT
EXIT
Circuit Diagram
NCEC0010
TEC694
EC-24
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Circuit Diagram (Cont’d)
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EC-25
SC
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IDX
TEC695
System Diagram
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
EXIT
EXIT
System Diagram
NCEC0011
SEF247YA
EC-26
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Vacuum Hose Drawing
EXIT
EXIT
Vacuum Hose Drawing
Refer to “System Diagram” on EC-26 for vacuum control system.
NCEC0012
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EC-27
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SEF829X
System Chart
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
EXIT
EXIT
Input (Sensor) ECM Function Output (Actuator)
I Camshaft position sensor
I Mass air flow sensor
I Engine coolant temperature sensor
I Front heated oxygen sensor
I Ignition switch
I Throttle position sensor
I PNP switch
I Air conditioner switch
I Knock sensor
I EGR temperature sensor*1
I Crankshaft position sensor (OBD)*1
I EVAP control system pressure sensor*1
I Fuel tank temperature sensor*1
I Battery voltage
I Power steering oil pressure switch
I Vehicle speed sensor
I Intake air temperature sensor
I Absolute pressure sensor
I Rear heated oxygen sensor*3
I TCM (Transmission control module)*2
I Closed throttle position switch*4
I Electrical load
I Fuel level sensor*1
I Refrigerant pressure sensor
System Chart
Fuel injection & mixture ratio control Injectors
Distributor ignition system Power transistor
Idle air control system IACV-AAC valve
Fuel pump control Fuel pump relay
On board diagnostic system
EGR control EGR volume control valve
Front and rear heated oxygen sensor
heater control
EVAP canister purge flow control
Cooling fan control Cooling fan relays
Air conditioning cut control Air conditioner relay
ON BOARD DIAGNOSIS for EVAP system
Malfunction indicator lamp
(On the instrument panel)
Heated oxygen sensor heater
EVAP canister purge volume control solenoid valve
I EVAP canister vent control
valve
I Vacuum cut valve bypass valve
NCEC0013
*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis.
*2: The DTC related to A/T will be sent to ECM.
*3: Under normal conditions, this sensor is not for engine control operation.
*4: This switch will operate in place of the throttle position sensor to control EVAP parts if the sensor malfunctions.
EC-28
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System
DESCRIPTION
Input/Output Signal Chart
Sensor Input Signal to ECM
Camshaft position sensor Engine speed and piston position
Mass air flow sensor Amount of intake air
Multiport Fuel Injection (MFI) System
ECM func-
tion
Actuator
NCEC0014
NCEC0014S01
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Engine coolant temperature sensor Engine coolant temperature
Front heated oxygen sensor Density of oxygen in exhaust gas
Throttle position sensor
PNP switch Gear position
Vehicle speed sensor Vehicle speed
Ignition switch Start signal
Air conditioner switch Air conditioner operation
Knock sensor Engine knocking condition
Electrical load Electrical load signal
Battery Battery voltage
Power steering oil pressure switch Power steering operation
Rear heated oxygen sensor* Density of oxygen in exhaust gas
Absolute pressure sensor Ambient air barometric pressure
* Under normal conditions, this sensor is not for engine control operation.
Throttle position
Throttle valve idle position
Fuel injection & mixture ratio
control
Injector
Basic Multiport Fuel Injection System
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the camshaft position sensor and the mass air
flow sensor.
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NCEC0014S02
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Various Fuel Injection Increase/Decrease Compensation
NCEC0014S03
In addition, the amount of fuel injected is compensated to improve engine performance under various operating conditions as listed below.
<Fuel increase>
I During warm-up
I When starting the engine
I During acceleration
I Hot-engine operation
I When selector lever is changed from “N” to “D” (A/T models only)
I High-load, high-speed operation
<Fuel decrease>
I During deceleration
I During high engine speed operation
I During high vehicle speed operation (M/T models)
I Extremely high engine coolant temperature
EC-29
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System (Cont’d)
EXIT
EXIT
Mixture Ratio Feedback Control (Closed loop control)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The three way catalyst can then better reduce CO, HC and NOx emissions. This system uses a front
heated oxygen sensor in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM
adjusts the injection pulse width according to the sensor voltage signal. For more information about the front
heated oxygen sensor, refer to EC-197. This maintains the mixture ratio within the range of stoichiometric (ideal
air-fuel mixture).
This stage is referred to as the closed loop control condition.
Rear heated oxygen sensor is located downstream of the three way catalyst. Even if the switching characteristics of the front heated oxygen sensor shift, the air-fuel ratio is controlled to stoichiometric by the signal from
the rear heated oxygen sensor.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
I Deceleration and acceleration
I High-load, high-speed operation
I Malfunction of front heated oxygen sensor or its circuit
I Insufficient activation of front heated oxygen sensor at low engine coolant temperature
I High engine coolant temperature
I During warm-up
I When starting the engine
Mixture Ratio Self-learning Control
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from the front heated
oxygen sensor. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as
close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled
as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot film) and characteristic
changes during operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This
is then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from the front heated oxygen sensor indicates whether the mixture ratio is RICH or LEAN
compared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is
rich, and an increase in fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
NCEC0014S04
SEF336W
NCEC0014S05
NCEC0014S06
EC-30
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System (Cont’d)
EXIT
EXIT
Fuel Injection Timing
NCEC0014S07
SEF337W
Two types of systems are used.
Sequential Multiport Fuel Injection System
NCEC0014S0701
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
NCEC0014S0702
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
Fuel Shut-off
NCEC0014S08
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Distributor Ignition (DI) System
DESCRIPTION
Input/Output Signal Chart
Sensor Input Signal to ECM
ECM func-
tion
Actuator
NCEC0015
NCEC0015S01
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Camshaft position sensor Engine speed and piston position
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor
Vehicle speed sensor Vehicle speed
Ignition switch Start signal
Knock sensor Engine knocking
PNP switch Gear position
Battery Battery voltage
Throttle position
Throttle valve idle position
Ignition timing control
Power transistor
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EC-31
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Distributor Ignition (DI) System (Cont’d)
EXIT
EXIT
System Description
SEF742M
NCEC0015S02
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of
the engine. The ignition timing data is stored in the ECM. This data forms the map shown above.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Computing this information, ignition signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
A°BTDC
During the following conditions, the ignition timing is revised by the ECM according to the other data stored
in the ECM.
I At starting
I During warm-up
I At idle
I At low battery voltage
I During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions.
If engine knocking occurs, the knock sensor monitors the condition. The signal is transmitted to the ECM. The
ECM retards the ignition timing to eliminate the knocking condition.
Air Conditioning Cut Control
DESCRIPTION
Input/Output Signal Chart
Sensor Input Signal to ECM
Air conditioner switch Air conditioner “ON” signal
PNP switch Neutral position
Throttle position sensor Throttle valve opening angle
Camshaft position sensor Engine speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
System Description
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
I When the accelerator pedal is fully depressed.
I When cranking the engine.
I At high engine speeds.
I When the engine coolant temperature becomes excessively high.
I When operating power steering during low engine speed or low vehicle speed.
I When engine speed is excessively low.
Air conditioner cut
control
ECM func-
tion
NCEC0016
NCEC0016S01
Actuator
Air conditioner relay
NCEC0016S02
EC-32
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Fuel Cut Control (at no load & high engine speed)
DESCRIPTION
Input/Output Signal Chart
Sensor Input Signal to ECM
Vehicle speed sensor Vehicle speed
PNP switch Neutral position
Throttle position sensor Throttle position
Engine coolant temperature sensor Engine coolant temperature
Camshaft position sensor Engine speed
Fuel Cut Control (at no load & high engine speed)
NCEC0017
NCEC0017S01
ECM func-
tion
Fuel cut
control
Injectors
Actuator
GI
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EXIT
EXIT
If the engine speed is above 3,950 rpm with no load, (for example, in Neutral and engine speed over 4,000
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,150 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under “Multiport Fuel Injection (MFI) System”,
EC-29.
Evaporative Emission System
DESCRIPTION
NCEC0018
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SEF569XA
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating.
EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow
rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as
the air flow increases.
EVAP canister purge control solenoid valve also shuts off the vapor purge line during decelerating and idling.
EC-33
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
EXIT
SEF396T
AEC778A
SEF427N
INSPECTION
EVAP Canister
NCEC0019
NCEC0019S01
Check EVAP canister as follows:
1. Pinch the fresh air hose.
2. Blow air into port A and check that air flows freely through port
B.
Tightening Torque
NCEC0019S02
Tighten EVAP canister as shown in the figure.
Make sure new O-ring is installed properly between EVAPcanister and EVAP canister vent control valve.
Fuel Tank Vacuum Relief Valve (Built into fuel filler cap)
NCEC0019S03
1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum.
Pressure:
15.3 - 20.0 kPa (0.156 - 0.204 kg/cm
2
, 2.22 - 2.90 psi)
Vacuum:
2
−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm
, −0.87 to
−0.48 psi)
3. If out of specification, replace fuel filler cap as an assembly.
CAUTION:
Use only a genuine NISSAN fuel filler cap as a replacement. If
an incorrect fuel filler cap is used, the MIL may come on.
SEF943S
Vacuum Cut Valve and Vacuum Cut Valve Bypass Valve
NCEC0019S05
Refer to EC-553.
Evaporative Emission (EVAP) Canister Purge Volume
Control Solenoid Valve
Refer to EC-370.
Fuel Tank Temperature Sensor
Refer to EC-287.
NCEC0019S06
NCEC0019S08
EC-34
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
EXIT
SEF462UC
EVAP Service Port
Positive pressure is delivered to the EVAP system through the
EVAP service port. If fuel vapor leakage in the EVAP system
occurs, use a leak detector to locate the leak.
NCEC0019S09
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EC-35
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
EXIT
PEF838U
PEF917U
SEF200U
How to Detect Fuel Vapor Leakage
NCEC0019S10
CAUTION:
I Never use compressed air or a high pressure pump.
I Do not start engine.
2
I Do not exceed 4.12 kPa (0.042 kg/cm
, 0.6 psi) of pressure
in EVAP system.
NOTE:
Improper installation of adapter to the service port may cause
a leak.
With CONSULT-II
1) Attach the EVAP service port adapter securely to the EVAP
service port.
2) Also attach the pressure pump and hose.
3) Turn ignition switch “ON”.
4) Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT
MODE” with CONSULT-II.
5) Touch “START”. A bar graph (Pressure indicating display) will
appear on the screen.
6) Apply positive pressure to the EVAP system until the pressure
indicator reaches the middle of the bar graph.
7) Remove the EVAP service port adapter and hose with pressure pump.
8) Locatethe leak using a leak detector.Refer to “EVAPORATIVE
EMISSION LINE DRAWING”, EC-37.
Without CONSULT-II
1) Attach the EVAP service port adapter securely to the EVAP
service port and pressure pump with pressure gauge to the
EVAP service port.
2) Apply battery voltage to between the terminals of both EVAP
canister vent control valve and vacuum cut valve bypass valve
to make a closed EVAP system.
3) To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014
to 0.028 kg/cm
2
, 0.2 to 0.4 psi).
4) Remove the EVAP service port adapter and hose with pressure pump.
5) Locatethe leak using a leak detector.Refer to “EVAPORATIVE
EMISSION LINE DRAWING”, EC-37.
SEF323Z
SEF931X
EC-36
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
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EVAPORATIVE EMISSION LINE DRAWING
NCEC0020
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EC-37
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SEF831XA
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
NOTE:
Do not use soapy water or any type of solvent while installing vacuum hoses or purge hoses.
EXIT
EXIT
SEF832X
EC-38
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
EXIT
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
System Description
NCEC0502
NCEC0502S01
SEF206VA
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From the beginning of refueling, the fuel tank pressure goes up. When the pressure reaches the setting value
of the refueling control valve (RCV) opening pressure, the RCV is opened.After RCV opens, the air and vapor
inside the fuel tank go through refueling EVAP vapor cut valve, RCV and refueling vapor line to the EVAP
canister. The vapor is absorbed by the EVAP canister and the air is released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed
and refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is
purged during driving.
The RCV is always closed during driving and the evaporative emission control system is operated the same
as conventional system.
WARNING:
When conducting inspections below, be sure to observe the following:
I Put a “CAUTION: INFLAMMABLE” sign in workshop.
I Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
I Be sure to furnish the workshop with a CO
fire extinguisher.
2
SEF830X
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EC-39
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
CAUTION:
I Before removing fuel line parts, carry out the following procedures:
a) Put drained fuel in an explosion-proof container and put lid on securely.
b) Release fuel pressure from fuel line. Refer to “Fuel Pressure Release”, EC-50.
c) Disconnect battery ground cable.
I Always replace O-ring when the fuel gauge retainer is removed.
I Do not kink or twist hose and tube when they are installed.
I Do not tighten hose and clamps excessively to avoid damaging hoses.
I After installation, run engine and check for fuel leaks at connection.
I Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.
EXIT
EXIT
Diagnostic Procedure
Symptom: Fuel Odor from EVAP Canister Is Strong.
1 CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Weigh the EVAP canister with EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).
OK or NG
OK © GO TO 2.
NG © GO TO 3.
2 CHECK IF EVAP CANISTER SATURATED WITH WATER
Does water drain from the EVAP canister?
NCEC0502S02
NCEC0502S0201
Yes © GO TO 3.
No (With CONSULT-II) © GO TO 6.
No (Without CONSULT-
II)
3 REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
© GO TO 7.
© GO TO 4.
SEF596U
YesorNo
EC-40
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
4 CHECK WATER SEPARATOR
1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.
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5. In case of NG in items2-4,replace the parts.
NOTE:
I Do not disassemble water separator.
OK or NG
OK © GO TO 5.
NG © Replace water separator.
5 DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and water separator for clogging or poor connection.
© Repair or replace EVAP hose.
SEF829T
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EC-41
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
6 CHECK REFUELING EVAP VAPOR CUT VALVE
With CONSULT-II
1. Remove fuel tank. Refer to FE-5, “FUEL SYSTEM.
2. Drain fuel from the tank as follows:
a. Remove fuel feed hose located on the fuel level sensor unit retainer.
b. Connect a spare fuel hose, one side to fuel level sensor unit retainer where the hose was removed and the other side
to a fuel container.
c. Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank.
4. Check EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector.
b. Remove fuel gauge retainer with fuel level sensor unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to both hose ends A and B [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level sensor unit
retainer remaining open and check that the pressure is applicable.
EXIT
EXIT
OK or NG
OK © GO TO 8.
NG © Replace refueling EVAP vapor cut valve with fuel tank.
SEF968X
EC-42
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
7 CHECK REFUELING EVAP VAPOR CUT VALVE
Without CONSULT-II
1. Remove fuel tank. Refer to FE-5, “FUEL SYSTEM”.
2. Drain fuel from the tank as follows:
a. Remove fuel level sensor unit retainer.
b. Drain fuel from the tank using a hand pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank.
4. Check EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector.
b. Remove fuel level sensor unit retainer with fuel level sensor unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to both hose ends A and B [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level sensor unit
retainer remaining open and check that the pressure is applicable.
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OK or NG
OK © GO TO 8.
NG © Replace refueling EVAP vapor cut valve with fuel tank.
8 CHECK REFUELING CONTROL VALVE
1. Remove fuel filler cap.
2. Check air continuity between hose ends A and B.
Blow air into the hose end B. Air should flow freely into the fuel tank.
3. Blow air into hose end A and check there is no leakage.
4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a suitable
3-way connector. Check that there is no leakage.
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OK or NG
OK © INSPECTION END
NG © Replace refueling control valve with fuel tank.
EC-43
SC
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
EXIT
EXIT
Symptom: Cannot Refuel/Fuel Odor From The Fuel Filler Opening Is Strong While Refueling.
1 CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Weigh the EVAP canister with EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).
OK or NG
OK © GO TO 2.
NG © GO TO 3.
2 CHECK IF EVAP CANISTER SATURATED WITH WATER
Does water drain from the EVAP canister?
NCEC0502S0202
Yes © GO TO 3.
No © GO TO 6.
3 REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
SEF596U
YesorNo
© GO TO 4.
EC-44
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
4 CHECK WATER SEPARATOR
1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.
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EXIT
5. In case of NG in items2-4,replace the parts.
NOTE:
I Do not disassemble water separator.
OK or NG
OK © GO TO 5.
NG © Replace water separator.
5 DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and water separator for clogging or poor connection.
© Repair or replace EVAP hose.
6 CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling control valve for clogging, kink, looseness and improper
connection.
OK or NG
OK © GO TO 7.
NG © Repair or replace hoses and tubes.
7 CHECK FILLER NECK TUBE
Check signal line and recirculation line for clogging, dents and cracks.
OK or NG
OK © GO TO 8.
NG © Replace filler neck tube.
SEF829T
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EC-45
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
8 CHECK REFUELING CONTROL VALVE
1. Remove fuel filler cap.
2. Check air continuity between hose ends A and B.
Blow air into the hose end B. Air should flow freely into the fuel tank.
3. Blow air into hose end A and check there is no leakage.
4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a suitable
3-way connector. Check that there is no leakage.
OK or NG
OK (With CONSULT-II) © GO TO 9.
OK (Without CONSULT-
II)
NG © Replace refueling control valve with fuel tank.
© GO TO 10.
SEF968X
EXIT
EXIT
9 CHECK REFUELING EVAP VAPOR CUT VALVE
With CONSULT-II
1. Remove fuel tank. Refer to FE-5, “FUEL SYSTEM”.
2. Drain fuel from the tank as follows:
a. Remove fuel feed hose located on the fuel level sensor unit retainer.
b. Connect a spare fuel hose, one side to fuel level sensor unit retainer where the hose was removed and the other side
to a fuel container.
c. Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank.
4. Check EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector.
b. Remove fuel level sensor unit retainer with fuel level sensor unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to both hose ends A and B [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level sensor unit
retainer remaining open and check that the pressure is applicable.
OK or NG
OK © GO TO 11.
NG © Replace refueling EVAP vapor cut valve with fuel tank.
EC-46
SEF968X
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
10 CHECK REFUELING EVAP VAPOR CUT VALVE
Without CONSULT-II
1. Remove fuel tank. Refer to FE-5, “FUEL SYSTEM”.
2. Drain fuel from the tank as follows:
a. Remove fuel level sensor unit retainer.
b. Drain fuel from the tank using a hand pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from hose end B), and check that the air flows freely into the tank.
4. Check EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose ends A and B using a suitable 3-way connector.
b. Remove fuel level sensor unit retainer with fuel level sensor unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to both hose ends A and B [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel level sensor unit
retainer remaining open and check that the pressure is applicable.
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EXIT
OK or NG
OK © GO TO 11.
NG © Replace refueling EVAP vapor cut valve with fuel tank.
11 CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
OK or NG
OK © GO TO 12.
NG © Replace fuel filler tube.
12 CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
OK or NG
OK © GO TO 13.
NG © Repair or replace one-way fuel valve with fuel tank.
SEF968X
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EC-47
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ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Evaporative Emission System (Cont’d)
13 CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank.
2. Remove fuel filler tube and hose.
3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close.
Do not drop any material into the tank.
OK or NG
OK © INSPECTION END
NG © Replace fuel filler tube or replace one-way fuel valve with fuel tank.
SEF665U
EXIT
EXIT
Positive Crankcase Ventilation
DESCRIPTION
This system returns blow-by gas to the intake collector.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air duct into the crankcase. In this process the air passes through
the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not meet the requirement. This is because some
of the flow will go through the hose connection to the intake collector under all conditions.
NCEC0022
SEF833X
EC-48
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Positive Crankcase Ventilation (Cont’d)
EXIT
EXIT
SEC137A
ET277
INSPECTION
PCV (Positive Crankcase Ventilation) Valve
With engine running at idle, remove PCV valve from rocker cover.
A properly working valve makes a hissing noise as air passes
through it. A strong vacuum should be felt immediately when a finger is placed over the valve inlet.
Ventilation Hose
1. Check hoses and hose connections for leaks.
2. Disconnect all hoses and clean with compressed air. If any
hose cannot be freed of obstructions, replace.
NCEC0023
NCEC0023S01
NCEC0023S02
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EC-49
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Fuel Pressure Release
BASIC SERVICE PROCEDURE
EXIT
EXIT
SAT845J
SEF214Y
Fuel Pressure Release
NCEC0024
Before disconnecting fuel line, release fuel pressure from fuel
line to eliminate danger.
WITH CONSULT-II
NCEC0024S01
1. Start engine.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-II.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch OFF.
WITHOUT CONSULT-II
NCEC0024S02
1. Remove fuse for fuel pump.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel
pressure.
4. Turn ignition switch OFF and reconnect fuel pump fuse.
SEF834X
SEF826X
Fuel Pressure Check
NCEC0025
I When reconnecting fuel line, always use new clamps.
I Make sure that clamp screw does not contact adjacent
parts.
I Use a torque driver to tighten clamps.
I Use Pressure Gauge to check fuel pressure.
I Do not perform fuel pressure check with system operat-
ing. Fuel pressure gauge may indicate false readings.
1. Release fuel pressure to zero.
2. Disconnect fuel hose from fuel feed tube (engine side).
3. Install pressure gauge between fuel hose and fuel feed tube.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.
At idle speed:
With vacuum hose connected
2
Approximately 235 kPa (2.4 kg/cm
, 34 psi)
With vacuum hose disconnected
Approximately 294 kPa (3.0 kg/cm
2
, 43 psi)
If results are unsatisfactory, perform Fuel Pressure Regulator
Check, EC-51.
EC-50
BASIC SERVICE PROCEDURE
Fuel Pressure Regulator Check
EXIT
EXIT
SEF718B
Fuel Pressure Regulator Check
1. Stop engine and disconnect fuel pressure regulator vacuum
hose from intake manifold collector.
2. Plug intake manifold collector with a rubber cap.
3. Connect variable vacuum source to fuel pressure regulator.
4. Start engine and read indication of fuel pressure gauge as
vacuum is changed.
Fuel pressure should decrease as vacuum increases. If results
are unsatisfactory, replace fuel pressure regulator.
NCEC0026
Injector
REMOVAL AND INSTALLATION
NCEC0027
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SEF324Z
1. Release fuel pressure to zero.
2. Remove accelerator wire bracket.
3. Remove EVAP canister purge volume control solenoid valve
and the bracket.
4. Remove ventilation hose.
5. Disconnect injector harness connectors.
6. Disconnect fuel pressure regulator vacuum hose from intake
manifold collector.
7. Disconnect fuel hoses from fuel tube assembly.
8. Remove injectors with fuel tube assembly.
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EC-51
Injector (Cont’d)
BASIC SERVICE PROCEDURE
9. Expand and remove clips securing fuel injectors.
10. Extract fuel injectors straight from fuel tubes.
I Be careful not to damage injector nozzles during removal.
I Do not bump or drop fuel injectors.
11. Carefully install O-rings, including the one used with the pressure regulator.
I Lubricate O-rings with a smear of engine oil.
I Be careful not to damage O-rings with service tools or
finger nails or clips. Do not expand or twist O-rings.
SEF703X
I Discard old clips; replace with new ones.
12. Position clips in grooves on fuel injectors.
I Make sure that protrusions of fuel injectors are aligned
with cutouts of clips after installation.
13. Align protrusions of fuel tubes with those of fuel injectors.
14. After properly inserting fuel injectors, check to make sure that
fuel tube protrusions are engaged with those of fuel injectors,
and that flanges of fuel tubes are engaged with clips.
EXIT
EXIT
SEF828X
15. Tighten fuel tube assembly mounting nuts in two stages.
: Tightening torque N·m (kg-m, ft-lb)
1st stage:
9.4 - 10.7 (0.95 - 1.1, 6.9 - 7.9)
2nd stage:
21 - 26 (2.1 - 2.7, 16 - 19)
16. Install all removed parts in the reverse order of removal.
CAUTION:
After properly connecting fuel tube assembly to injector and
fuel hose, check connection for fuel leakage.
EC-52
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment
PREPARATION
I Make sure that the following parts are in good order.
a) Battery
b) Ignition system
c) Engine oil and coolant levels
d) Fuses
e) ECM harness connector
f) Vacuum hoses
g) Air intake system
(Oil filler cap, oil level gauge, etc.)
h) Fuel pressure
i) Engine compression
j) EGR valve operation
k) Throttle valve
l) EVAP system
I On models equipped with air conditioner, checks should be carried out while the air conditioner is
“OFF”.
I On models equipped with automatic transaxle, when checking idle speed, ignition timing and mix-
ture ratio, checks should be carried out while shift lever is in “P” or “N” position.
I When measuring “CO” percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
I Turn off headlamps, heater blower, rear window defogger.
I Keep front wheels pointed straight ahead.
I Make the check after the cooling fan has stopped.
=NCEC0028
NCEC0028S01
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EC-53
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EXIT
EXIT
Overall Inspection Sequence
NCEC0028S0101
SEF906X
EC-54
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EXIT
EXIT
INSPECTION PROCEDURE
1 INSPECTION START
1. Visually check the following:
I Air cleaner clogging
I Hoses and ducts for leaks
I EGR valve operation
I Electrical connectors
I Gasket
I Throttle valve and throttle position sensor operation
2. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine stays below 1,000 rpm.
3. Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
=NCEC0028S02
AEC692
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4. Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK (With CONSULT-II) © GO TO 3.
OK (Without CONSULT-
II)
NG © GO TO 2.
2 REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding “Diagnostic Procedure”.
With CONSULT-II © GO TO 3.
Without CONSULT-II © GO TO 4.
© GO TO 4.
SEF977U
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EC-55
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BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
3 CHECK IGNITION TIMING
With CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about 1 minute.
3. Select “IGNITION TIMING ADJ” in WORK SUPPORT mode.
4. Touch “START”.
SEF978U
EXIT
EXIT
5. Start and rev engine (2,000 - 3,000 rpm) two or three times under no-load, then run at idle speed.
6. Check ignition timing with a timing light.
M/T: 15°±2° BTDC
A/T: 15°±2° BTDC (in “P” or “N” position)
OK or NG
OK © GO TO 6.
NG © GO TO 5.
PEF546N
AEC804
EC-56
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
4 CHECK IGNITION TIMING
Without CONSULT-II
1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about 1 minute.
SEF978U
3. Turn off engine and disconnect throttle position sensor harness connector.
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4. Start and rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run at idle speed.
5. Check ignition timing with a timing light.
M/T: 15°±2° BTDC
A/T: 15°±2° BTDC (in “P” or “N” position)
OK or NG
OK © GO TO 6.
NG © GO TO 5.
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BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
5 ADJUST IGNITION TIMING
With CONSULT-II
1. Adjust ignition timing to the specified value by turning distributor after loosening bolts which secure distributor.
Without CONSULT-II
1. Adjust ignition timing to the specified value by turning distributor after loosening bolts which secure distributor.
2. Turn off engine and connect throttle position sensor harness connector to throttle position sensor.
With CONSULT-II © GO TO 3.
Without CONSULT-II © GO TO 4.
SEF837X
EXIT
EXIT
6 PERFORM IDLE AIR VOLUME LEARNING
With CONSULT-II
1. Start and rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run it at idle speed.
2. Perform “Idle Air Volume Learning”, EC-65.
Without CONSULT-II
1. Turn off engine and connect throttle position sensor harness connector.
2. Start and rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run it at idle speed.
3. Perform “Idle Air Volume Learning”, EC-65.
© GO TO 7.
SEF837X
EC-58
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
7 CHECK TARGET IDLE SPEED
With CONSULT-II
1. Start and rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run it at idle speed.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.
M/T: 800±50 rpm
A/T: 800±50 rpm (in “P” or “N” position)
SEF058Y
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EXIT
Without CONSULT-II
1. Start and rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run it at idle speed.
2. Check idle speed.
M/T: 800±50 rpm
A/T: 800±50 rpm (in “P” or “N” position)
OK or NG
OK (With CONSULT-II) © GO TO 9.
OK (Without CONSULT-
II)
NG © GO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
I Check IACV-AAC valve and replace if necessary. Refer to EC-425.
I Check IACV-AAC valve harness and repair if necessary. Refer to EC-425.
I Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
With
CONSULT-II
Without
CONSULT-II
© GO TO 10.
© GO TO 9.
© GO TO 10.
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BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
9 CHECK FRONT HEATED OXYGEN SENSOR SIGNAL
With CONSULT-II
1. See “FR O2 MNTR-B1” in “DATA MONITOR” mode.
2. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the
monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
SEF171Y
1 time: RICH → LEAN → RICH
2 times: RICH → LEAN → RICH → LEAN → RICH
OK or NG
OK © INSPECTION END
NG (Monitor does not
fluctuate.)
NG (Monitor fluctuates
less than 5 times.)
© GO TO 13.
© GO TO 11.
EXIT
EXIT
10 CHECK FRONT HEATED OXYGEN SENSOR SIGNAL
Without CONSULT-II
1. Set voltmeter probe between ECM terminal 62 and ground.
2. Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000
rpm.
1 time: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
2 times: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
OK or NG
OK © INSPECTION END
NG (Voltage does not
fluctuate.)
NG (Voltage fluctuates
less than 5 times.)
© GO TO 13.
© GO TO 11.
EC-60
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
11 CHECK FRONT HEATED OXYGEN SENSOR SIGNAL
With CONSULT-II
1. Stop engine.
2. Replace front heated oxygen sensor.
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See “FR O2 MNTR-B1” in “DATA MONITOR” mode.
6. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the
monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
1 time: RICH → LEAN → RICH
2 times: RICH → LEAN → RICH → LEAN → RICH
Without CONSULT-II
1. Stop engine.
2. Replace front heated oxygen sensor.
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 62 and ground.
6. Make sure that the voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000
rpm.
1 time: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
2 times: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
OK or NG
OK © INSPECTION END
NG © GO TO 12.
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12 DETECT MALFUNCTIONING PART
Check the following.
I Check fuel pressure regulator. Refer to EC-51.
I Check mass air flow sensor and its circuit. Refer to EC-152.
I Check injector and its circuit. Refer to EC-575.
Clean or replace if necessary.
I Check engine coolant temperature sensor and its circuit. Refer to EC-172.
I Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
© GO TO 6.
13 CHECK FRONT HEATED OXYGEN SENSOR HARNESS
1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect front heated oxygen sensor harness connector.
4. Check harness continuity between ECM terminal 62 and front heated oxygen sensor harness connector terminal 2.
Refer to Wiring Diagram, EC-200.
Continuity should exist.
OK or NG
OK © GO TO 15.
NG © GO TO 14.
14 REPAIR OR REPLACE
Repair or replace harness between ECM and front heated oxygen sensor.
© GO TO 6.
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EC-61
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
15 PREPARATION FOR “CO” % CHECK
With CONSULT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch “ON”.
3. Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.
4. Set “ENG COOLANT TEMP” to 5°C (41°F) by touching “DWN” and “Qd”.
Without CONSULT-II
1. Disconnect ECM harness connector.
2. Disconnect engine coolant temperature sensor harness connector.
3. Connect a resistor (4.4 kΩ) between terminals of engine coolant temperature sensor harness connector.
SEF172Y
EXIT
EXIT
SEF982UA
© GO TO 16.
EC-62
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
16 CHECK “CO” %
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
AEC692
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3. Check “CO” %.
Idle CO: Less than 11%
4.
a. Disconnect the resistor from terminals of engine coolant temperature sensor.
b. Connect engine coolant temperature sensor harness connector to engine coolant temperature sensor.
OK © GO TO 17.
NG © GO TO 18.
Without CONSULT-II
After checking CO%,
OK or NG
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EC-63
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BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
17 CHECK FRONT HEATED OXYGEN SENSOR SIGNAL
With CONSULT-II
1. Stop engine.
2. Replace front heated oxygen sensor.
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See “FR O2 MNTR-B1” in “DATA MONITOR” mode.
6. Maintaining engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the
monitor fluctuates between “LEAN” and “RICH” more than 5 times during 10 seconds.
1 time: RICH → LEAN → RICH
2 times: RICH → LEAN → RICH → LEAN → RICH
Without CONSULT-II
1. Stop engine.
2. Replace front heated oxygen sensor.
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 62 and ground.
6. Make sure that voltage fluctuates between 0 - 0.3V and 0.6 - 1.0V more than 5 times during 10 seconds at 2,000 rpm.
1 time: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
2 times: 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 - 0.3V
OK or NG
OK © GO TO 6.
NG © GO TO 18.
EXIT
EXIT
18 DETECT MALFUNCTIONING PART
Check the following.
I Connect front heated oxygen sensor harness connector to front heated oxygen sensor.
I Check fuel pressure regulator. Refer to EC-51.
I Check mass air flow sensor and its circuit. Refer to EC-152.
I Check injector and its circuit. Refer to EC-575.
Clean or replace if necessary.
I Check engine coolant temperature sensor and its circuit. Refer to EC-172.
I Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
© GO TO 6.
EC-64
BASIC SERVICE PROCEDURE
Idle Air Volume Learning
EXIT
EXIT
SEF452Y
SEF454Y
Idle Air Volume Learning
DESCRIPTION
“Idle Air Volume Learning” is an operation to learn the idle air volume that keeps each engine within the specific range. It must be
performed under any of the following conditions:
I Each time IACV-AAC valve, throttle body or ECM is replaced.
I Idle speed or ignition timing is out of specification.
PRE-CONDITIONING
Before performing “IdleAir Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.
I Battery voltage: More than 12.9V (At idle)
I Engine coolant temperature: 70 - 95°C (158 - 203°F)
I PNP switch: ON
I Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime running light systems, if
the parking brake is applied beore the engine is started, the
headlamp will not be illuminated.
I Cooling fan motor: Not operating
I Steering wheel: Neutral (Straight-ahead position)
I Vehicle speed: Stopped
I Transmission: Warmed-up
For A/T models with CONSULT-II, drive vehicle until “FLUID
TEMP SE” in “DATA MONITOR” mode of “A/T” system indicates less than 0.9V.
For A/T models without CONSULT-II and M/T models, drive
vehicle for 10 minutes.
NCEC0503
NCEC0503S01
NCEC0503S02
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OPERATION PROCEDURE
With CONSULT-II
1. Turn ignition switch “ON” and wait at least 1 second.
2. Turn ignition switch “OFF” and wait at least 10 seconds.
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING” (previously mentioned) are in good order.
5. Turn ignition switch “OFF” and wait at least 10 seconds.
6. Start the engine and let it idle for at least 15 seconds.
7. Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
8. Touch “START” and wait 15 seconds.
9. Make sure that “CMPLT” is displayed on CONSULT-II screen.
If “INCMP” is displayed, “Idle Air Volume Learning” will not be
carried out successfully. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
ITEM SPECIFICATION
Idle speed M/T: 800±50 rpm
A/T: 800±50 rpm (in “P” or “N” position)
Ignition timing M/T: 15°±2° BTDC
A/T: 15°±2° BTDC (in “P” or “N” position)
NCEC0503S03
NCEC0503S0301
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EC-65
Idle Air Volume Learning (Cont’d)
BASIC SERVICE PROCEDURE
EXIT
EXIT
SEF837X
Without CONSULT-II
=NCEC0503S0302
1. Turn ignition switch “ON” and wait at least 1 second.
2. Turn ignition switch “OFF” and wait at least 10 seconds.
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic “PRE-CONDITIONING” (previously mentioned) are in good order.
5. Turn ignition switch “OFF” and wait at least 10 seconds.
6. Start the engine and let it idle for at least 15 seconds.
7. Disconnect throttle position sensor harness connector (brown),
then reconnect it within 5 seconds.
8. Wait 15 seconds.
9. Make sure that idle speed is within specifications. If not, the
result will be incomplete. In this case, find the cause of the
problem by referring to the NOTE below.
10. Rev up the engine two or three times. Make sure that idle
speed and ignition timing are within specifications.
ITEM SPECIFICATION
Idle speed M/T: 800±50 rpm
A/T: 800±50 rpm (in “P” or “N” position)
Ignition timing M/T: 15°±2° BTDC
A/T: 15°±2° BTDC (in “P” or “N” position)
NOTE:
If idle air volume learning cannot be performed successfully,
proceed as follows:
1) Check that throttle valve is fully closed.
2) Check that downstream of throttle valve is free from air
leakage.
3) Adjust closed throttle position switch and reset memory.
(Refer to Basic Inspection, EC-106.)
4) When the above three items check out OK, engine component parts and their installation condition are questionable. Check and eliminate the cause of the problem.
5) If any of the following conditions occur after the engine
has started, eliminate the cause of the problem and perform “Idle air volume learning” all over again:
I Engine stalls.
I Erroneous idle.
I Blown fuses related to the IACV-AAC valve system.
EC-66
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Introduction
EXIT
EXIT
Introduction
NCEC0029
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actuators. The ECM also records various emission-related diagnostic information including:
Emission-related diagnostic information SAE Mode
Diagnostic Trouble Code (DTC) Mode 3 of SAE J1979
Freeze Frame data Mode 2 of SAE J1979
System Readiness Test (SRT) code Mode 1 of SAE J1979
1st Trip Diagnostic Trouble Code (1st Trip DTC) Mode 7 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limits Mode 6 of SAE J1979
The above information can be checked using procedures listed in the table below.
X: Applicable —: Not applicable
DTC 1st trip DTC
CONSULT-II X X X X X —
GST X X*1 X — X X
*1: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
Freeze Frame
data
1st trip Freeze
Frame data
SRT code Test value
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-123.)
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Two Trip Detection Logic
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in
the ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored
in the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
Items
Coolant overtemperature enrichment protection — DTC: P0217
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0304
is being detected
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0304
is being detected
Closed loop control
— DTC: P1148
MIL DTC 1st trip DTC
1st trip 2nd trip
Blinking Lighting up Blinking
— X ——X—X—
X — ————X—
——X——X——
— X ——X—X—
Lighting
up
1st trip
displaying
displaying
X: Applicable —: Not Exit
2nd trip
1st trip
displaying
NCEC0030
2nd trip
displaying
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Fail-safe items (Refer to EC-123.) — X — — X*1 — X*1 —
Except above — — — X — X X —
*1: Except “ECM”
EC-67
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information
EXIT
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Emission-related Diagnostic Information
DTC AND 1ST TRIP DTC
NCEC0031
NCEC0031S01
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consecutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and
2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in “HOW TO
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”, EC-79.
For malfunctions in which 1st trip DTCs are displayed, refer to EC-77. These items are required by legal
regulations to continuously monitor the system/component. In addition, the items monitored non-continuously
are also displayed on CONSULT-II.
1st trip DTC is specified in Mode 7 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL
and therefore does not warn the driver of a problem. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in “Work Flow” procedure Step II, refer to EC-104. Then perform “DTC Confirmation Procedure” or “Overall Function Check” to try to duplicate the problem. If the malfunction is duplicated, the item
requires repair.
How to Read DTC and 1st Trip DTC
DTC and 1st trip DTC can be read by the following methods.
With CONSULT-II
With GST
CONSULT-II or GST (Generic Scan Tool) Examples: P0340, P1320, P0705, P0750, etc.
These DTCs are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)
I 1st trip DTC No. is the same as DTC No.
I Output of a DTC indicates a malfunction. However, GST does not indicate whether the malfunction
is still occurring or has occurred in the past and has returned to normal. CONSULT-II can identify
malfunction status as shown below. Therefore, using CONSULT-II (if available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times
the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be “0”.
If a 1st trip DTC is stored in the ECM, the time data will be “[1t]”.
NCEC0031S0101
SEF992X
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
NCEC0031S02
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant
temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed and absolute pressure at
the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
EC-68
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see EC-92.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the following priorities to update the data.
Priority Items
Freeze frame data Misfire — DTC: P0300 - P0304
1
2 Except the above items (Includes A/T related items)
3 1st trip freeze frame data
Fuel Injection System Function — DTC: P0171, P0172
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For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different malfunction is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or
1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and
freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged
in the ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM
memory is erased. Procedures for clearing the ECM memory are described in “HOW TO ERASE EMISSIONRELATED DIAGNOSTIC INFORMATION”, EC-79.
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”,
use the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer’s
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM
memory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will continue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:
If MIL is “ON” during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.
NCEC0031S03
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EC-69
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
SRT item
(CONSULT-II indica-
tion)
CATALYST 3 Three way catalyst function P0420
EVAP SYSTEM 2 EVAP control system (small leak) (negative pressure) P0440
O2 SENSOR 3 Front heated oxygen sensor (circuit) P0130
Perfor-
mance Pri-
ority*2
— EVAP control system (small leak) (positive pressure) P1440*1
3 EVAP control system purge flow monitoring P1447
Required self-diagnostic items to set the SRT to “CMPLT”
Front heated oxygen sensor (lean shift monitoring) P0131
Front heated oxygen sensor (rich shift monitoring) P0132
Front heated oxygen sensor (response monitoring) P0133
Front heated oxygen sensor (high voltage) P0134
Rear heated oxygen sensor (min. voltage monitoring) P0137
Rear heated oxygen sensor (max. voltage monitoring) P0138
Rear heated oxygen sensor (response monitoring) P0139
Rear heated oxygen sensor (high voltage) P0140
=NCEC0031S0307
Corresponding
DTC No.
O2 SEN HEATER 3 Front heated oxygen sensor heater P0135
Rear heated oxygen sensor heater P0141
EGR SYSTEM 3 EGR function (close) P0400
1 EGR function (open) P1402
*1: P1440 [EVAPcontrolsystem(smallleak) (positive pressure) diagnosis] is one type of SRTrelateddiagnosis.Thisdiagnosis, however,
does not contribute to setting the SRT as “CMPLT”, when no malfunction exists in the EVAP system. Therefore, P0440 must be used
instead of P1440.
*2: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority
for models with CONSULT-II.
EC-70
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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SRT Set Timing
=NCEC0031S0308
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRTis done
regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is
shown in the table below.
Example
Self-diagnosis result
All OK Case 1 P0400 OK (1) — (1) OK (2) — (2)
Case 2 P0400 OK (1) — (1) — (1) — (1)
NG exists Case 3 P0400 OK OK — —
Diagnosis
P0402 OK (1) — (1) — (1) OK (2)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “CMPLT” “CMPLT” “CMPLT” “CMPLT”
P0402 — (0) — (0) OK (1) — (1)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “INCMP” “INCMP” “CMPLT” “CMPLT”
P0402 ————
P1402 NG — NG
+ ON , OFF + ON , OFF + ON , OFF + ON ,
Ignition cycle
NG
(Consecutive
NG)
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(1st trip)
DTC
SRT of EGR “INCMP” “INCMP” “INCMP” “CMPLT”
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT
1st trip DTC — 1st trip DTC
(= MIL “ON”)
will indicate “CMPLT”. , Case 1 above
When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate “CMPLT” at the time the respective self-diagnoses have at least one OK result. , Case 2 above
If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indicate “CMPLT”. , Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one (1) for each
self-diagnosis (Case1&2)ortwo(2)foroneofself-diagnoses (Case 3). However, in preparation for the state
emissions inspection, it is unnecessary of each self-diagnosis to be executed twice (Case 3) for the following
reasons:
I The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
I The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
I When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diag-
nosis memory must be erased from ECM after repair.
I If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out prior
to the state emission inspection even though the SRT indicates “CMPLT”.
DTC
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SRT Service Procedure
NCEC0031S0309
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence on the next page.
EC-71
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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*1 EC-68 *2 EC-72 *3 EC-73
How to Display SRT Code
With CONSULT-II
Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with CONSULT-II.
For items whose SRT codes are set, a “CMPLT” is displayed on the CONSULT-II screen; for items whose SRT
codes are not set, “INCMP” is displayed.
With GST
Selecting Mode 1 with GST (Generic Scan Tool)
A sample of CONSULT-II display for SRT code is shown below.
“INCMP” means the self-diagnosis is incomplete and SRT is not set. “CMPLT” means the self-diagnosis is
complete and SRT is set.
SEF170Z
NCEC0031S0301
EC-72
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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How to Set SRT Code
To set all SRTcodes, self-diagnosis for the items indicated above must be performed one or more times. Each
diagnosis may require a long period of actual driving under various conditions.
With CONSULT-II
Perform corresponding DTC Confirmation Procedure one by one based on “Performance Priority” in the table
on EC-70.
Without CONSULT-II
The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The
driving pattern should be performed one or more times to set all SRT codes.
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EC-73
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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Driving Pattern
NCEC0031S0303
SEF574X
EC-74
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
I The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driv-
ing habits, etc.
Zone A refers to the range where the time required, for the diagnosis under normal conditions*, is the
shortest.
Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed
within zone A.
*: Normal conditions refer to the following:
− Sea level
− Flat road
− Ambient air temperature: 20 - 30°C (68 - 86°F)
− Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)], diagnosis may also be performed.
Pattern 1:
I The engine is started at the engine coolant temperature of −10 to 35°C (14 to 95°F)
(where the voltage between the ECM terminals 70 and 58 is 3.0 - 4.3V).
I The engine must be operated at idle speed until the engine coolant temperature is greater than 70°C
(158°F) (where the voltage between the ECM terminals 70 and 58 is lower than 1.4V).
I The engine is started at the fuel tank temperature of warmer than 0°C (32°F) (where the voltage
between the ECM terminal 82 and ground is less than 4.1V).
Pattern 2:
I When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
Pattern 3:
I The driving pattern outlined in *2 must be repeated at least 3 times.
Pattern 4:
I Tests are performed after the engine has been operated for at least 17 minutes.
I The accelerator pedal must be held very steady during steady-state driving.
I If the accelerator pedal is moved, the test must be conducted all over again.
*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal
and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h
(56 MPH) again.
*2: Operate the vehicle in the following driving pattern.
1) Decelerate vehicle to 0 km/h (0 MPH) and let engine idle.
2) Repeat driving pattern shown below at least 10 times.
I During acceleration, hold the accelerator pedal as steady as possible.
3) Repeat steps 1 and 2 until the EGR system SRT is set.
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*3: Checking the vehicle speed with GST is advised.
Suggested Transmission Gear Position for A/T Models
Set the selector lever in the “D” position with the overdrive switch turned ON.
EC-75
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
Suggested upshift speeds for M/T models
Shown below are suggested vehicle speeds for shifting into a higher gear. These suggestions relate to fuel
economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather
and individual driving habits.
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For normal acceleration in low altitude
areas
[less than 1,219 m (4,000 ft)]:
Gear change
1st to 2nd 24 (15) 25 (15)
2nd to 3rd 40 (25) 40 (25)
3rd to 4th 65 (40) 65 (40)
4th to 5th 75 (45) 75 (45)
ACCEL shift point
km/h (MPH)
For quick acceleration in low altitude areas and high
altitude areas
[over 1,219 m (4,000 ft)]:
km/h (MPH)
Suggested Maximum Speed in Each Gear
Downshift to a lower gear if the engine is not running smoothly, or if you need to accelerate.
Do not exceed the maximum suggested speed (shown below) in any gear. For level road driving, use the
highest gear suggested for that speed. Always observe posted speed limits and drive according to the road
conditions to ensure safe operation. Do not over-rev the engine when shifting to a lower gear as it may cause
engine damage or loss of vehicle control.
Gear km/h (MPH)
1st 55 (35)
2nd 95 (60)
3rd 135 (85)
4th —
5th —
TEST VALUE AND TEST LIMIT (GST ONLY — NOT APPLICABLE TO CONSULT-II)
The following is the information specified in Mode 6 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is “OK” or “NG” while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
Items for which these data (test value and test limit) are displayed are the same as SRT code items (9 test
items).
These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be displayed on the GST screen.
X: Applicable —: Not applicable
SRT item Self-diagnostic test item
CATALYST Three way catalyst function
EVAP control system
(Small leak)
EVAP SYSTEM
EVAP control system purge
flow monitoring
Test value (GST display)
Test limit Application
TID CID
01H 01H Max. X
02H 81H Min. X
05H 03H Max. X
06H 83H Min. X
NCEC0031S04
EC-76
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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SRT item Self-diagnostic test item
Front heated oxygen sensor
O2 SENSOR
Rear heated oxygen sensor
Front heated oxygen sensor
O2 SENSOR HEATER
Rear heated oxygen sensor
EGR SYSTEM EGR function
heater
heater
Test value (GST display)
Test limit Application
TID CID
09H 04H Max. X
0AH 84H Min. X
0BH 04H Max. X
0CH 04H Max. X
0DH 04H Max. X
19H 86H Min. X
1AH 86H Min. X
1BH 06H Max. X
1CH 06H Max. X
29H 08H Max. X
2AH 88H Min. X
2DH 0AH Max. X
2EH 8AH Min. X
31H 8CH Min. X
32H 8CH Min. X
33H 8CH Min. X
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34H 8CH Min. X
35H 0CH Max. X
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
X: Applicable —: Not applicable
(CONSULT-II screen terms)
NO DTC IS DETECTED. FURTHER TESTING MAY BE
REQUIRED.
MAF SEN/CIRCUIT P0100 — — X EC-152
ABSL PRES SEN/CIRC P0105 — — X EC-161
AIR TEMP SEN/CIRC P0110 — — X EC-166
COOLANT T SEN/CIRC P0115 — — X EC-172
THRTL POS SEN/CIRC P0120 — — X EC-178
*COOLAN T SEN/CIRC P0125 — — X EC-191
FRONT O2 SENSOR-B1 P0130 X X X*2 EC-197
FRONT O2 SENSOR-B1 P0131 X X X*2 EC-205
FRONT O2 SENSOR-B1 P0132 X X X*2 EC-211
FRONT O2 SENSOR-B1 P0133 X X X*2 EC-218
Items
DTC*1 SRT code
P0000 ————
Test value/ Test
limit
(GST only)
1st trip DTC*1 Reference page
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FRONT O2 SENSOR-B1 P0134 X X X*2 EC-227
FR O2 SE HEATER-B1 P0135 X X X*2 EC-233
EC-77
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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Items
(CONSULT-II screen terms)
REAR O2 SENSOR-B1 P0137 X X X*2 EC-238
REAR O2 SENSOR-B1 P0138 X X X*2 EC-246
REAR O2 SENSOR-B1 P0139 X X X*2 EC-254
REAR O2 SENSOR-B1 P0140 X X X*2 EC-262
RR O2 SE HEATER-B1 P0141 X X X*2 EC-268
FUEL SYS-LEAN/BK1 P0171 — — X EC-273
FUEL SYS-RICH/BK1 P0172 — — X EC-280
FUEL TEMP SEN/CIRC P0180 — — X EC-287
ENG OVER TEMP P0217 — — X EC-292
MULTI CYL MISFIRE P0300 — — X EC-310
CYL 1 MISFIRE P0301 — — X EC-310
CYL 2 MISFIRE P0302 — — X EC-310
CYL 3 MISFIRE P0303 — — X EC-310
CYL 4 MISFIRE P0304 — — X EC-310
KNOCK SEN/CIRC-B1 P0325 — — — EC-317
DTC*1 SRT code
Test value/ Test
limit
(GST only)
1st trip DTC*1 Reference page
CPS/CIRCUIT (OBD) P0335 — — X EC-321
CAM POS SEN/CIRC P0340 — — X EC-327
EGR SYSTEM P0400 X X X*2 EC-335
EGR VOL CONT/V CIR P0403 — — X EC-345
TW CATALYST SYS-B1 P0420 X X X*2 EC-352
EVAP SMALL LEAK P0440 X X X*2 EC-356
PURG VOLUME CONT/V P0443 — — X EC-370
VENT CONTROL VALVE P0446 — — X EC-377
EVAPO SYS PRES SEN P0450 — — X EC-384
EVAP GROSS LEAK P0455 — X X*2 EC-397
FUEL LV SE (SLOSH) P0460 — — X EC-409
FUEL LEVEL SENSOR P0461 — — X EC-414
FUEL LEVL SEN/CIRC P0464 — — X EC-416
VEH SPEED SEN/CIRC P0500 — — X EC-421
IACV/AAC VLV/CIRC P0505 — — X EC-425
CLOSED TP SW/CIRC P0510 — — X EC-434
A/T COMM LINE P0600 — — — EC-442
ECM P0605 — — X EC-445
PNP SW/CIRC P0705 — — X AT-104
ATF TEMP SEN/CIRC P0710 — — X AT-110
VEH SPD SEN/CIR AT P0720 — — X AT-116
ENGINE SPEED SIG P0725 — — X AT-121
EC-78
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
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Items
(CONSULT-II screen terms)
A/T 1ST GR FNCTN P0731 — — X AT-125
A/T 2ND GR FNCTN P0732 — — X AT-132
A/T 3RD GR FNCTN P0733 — — X AT-138
A/T 4TH GR FNCTN P0734 — — X AT-144
TCC SOLENOID/CIRC P0740 — — X AT-154
A/T TCC S/V FNCTN P0744 — — X AT-160
L/PRESS SOL/CIRC P0745 — — X AT-171
SFT SOL A/CIRC P0750 — — X AT-178
SFT SOL B/CIRC P0755 — — X AT-184
THERMOSTAT FNCTN P1126 — — X EC-447
CLOSED LOOP-B1 P1148 — — X EC-449
ENG OVER TEMP P1217 — — X EC-451
IGN SIGNAL-PRIMARY P1320 — — X EC-469
CPS/CIRC (OBD) COG P1336 — — X EC-476
EGR TEMP SEN/CIRC P1401 — — X EC-482
EGR SYSTEM P1402 X X X*2 EC-490
DTC*1 SRT code
Test value/ Test
limit
(GST only)
1st trip DTC*1 Reference page
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EVAP SMALL LEAK P1440 X X X*2 EC-500
PURG VOLUME CONT/V P1444 — — X EC-502
VENT CONTROL VALVE P1446 — — X EC-514
EVAP PURG FLOW/MON P1447 X X X*2 EC-522
VENT CONTROL VALVE P1448 — — X EC-534
FUEL LEVL SEN/CIRC P1464 — — X EC-543
VC/V BYPASS/V P1490 — — X EC-547
VC CUT/V BYPASS/V P1491 — — X EC-553
A/T DIAG COMM LINE P1605 — — X EC-565
TP SEN/CIRC A/T P1705 — — X AT-190
P-N POS SW/CIRCUIT P1706 — — X EC-568
O/R CLTCH SOL/CIRC P1760 — — X AT-199
*1: 1st trip DTC No. is the same as DTC No.
*2: These are not displayed with GST.
HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION
How to Erase DTC ( With CONSULT-II)
NOTE:
If the DTC is not for A/T related items (see EC-8), skip steps 2 through 4.
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Turn CONSULT-II “ON” and touch “A/T”.
3. Touch “SELF-DIAG RESULTS”.
4. Touch “ERASE”. [The DTC in the TCM (Transmission control module) will be erased.] Then touch “BACK”
twice.
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NCEC0031S0601
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EC-79
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
5. Touch “ENGINE”.
6. Touch “SELF-DIAG RESULTS”.
7. Touch “ERASE”. (The DTC in the ECM will be erased.)
I If DTCs are displayed for both ECM and TCM (Transmission control module), they need to be erased
individually from the ECM and TCM (Transmission control module).
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The emission related diagnostic information in the ECM can be erased by selecting “ERASE” in the “SELFDIAG RESULTS” mode with CONSULT-II.
How to Erase DTC ( With GST)
NOTE:
If the DTC is not for A/T related items (see EC-8), skip step 2.
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Perform “SELF-DIAGNOSTIC PROCEDURE (Without CONSULT-II)” in AT section titled “TROUBLE
DIAGNOSIS”, “Self-diagnosis”. (The engine warm-up step can be skipped when performing the diagnosis
only to erase the DTC.)
3. Select Mode 4 with GST (Generic Scan Tool).
The emission related diagnostic information in the ECM can be erased by selecting Mode 4 with GST.
I If the battery is disconnected, the emission-related diagnostic information will be lost after approx.
24 hours.
I The following data are cleared when the ECM memory is erased.
1) Diagnostic trouble codes
2) 1st trip diagnostic trouble codes
3) Freeze frame data
4) 1st trip freeze frame data
EC-80
SEF966X
NCEC0031S0602
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Emission-related Diagnostic Information (Cont’d)
5) System readiness test (SRT) codes
6) Test values
7) Others
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but
all of the data listed above, are cleared from the ECM memory during work procedures.
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM — NATS)
SEF515Y
I If the security indicator lights up with the ignition switch in the “ON” position or “NATS MALFUNC-
TION” is displayed on “SELF-DIAG RESULTS” screen, perform self-diagnostic results mode with
CONSULT-II using NATS program card. Refer to EL-248, “IVIS (INFINITI Vehicle Immobilizer System
— NATS)”.
I Confirm no self-diagnostic results of IVIS (NATS) is displayed before touching “ERASE” in “SELF-
DIAG RESULTS” mode with CONSULT-II.
I When replacing ECM, initialization of IVIS (NATS) system and registration of all IVIS (NATS) igni-
tion key IDs must be carried out with CONSULT-II using NATS program card.
Therefore, be sure to receive all keys from vehicle owner. Regarding the procedures of IVIS (NATS)
initialization and IVIS (NATS) ignition key ID registration, refer to CONSULT-II operation manual,
IVIS/NVIS.
Malfunction Indicator Lamp (MIL)
DESCRIPTION
NCEC0031S07
NCEC0032
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The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned ON without the engine running. This is a bulb check.
I If the MIL does not light up, refer to EL-98, “WARNING LAMPS” or see EC-610.
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has detected an engine system malfunction.
EC-81
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Malfunction Indicator Lamp (MIL) (Cont’d)
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On Board Diagnostic System Function
=NCEC0032S01
The on board diagnostic system has the following two functions.
Diagnostic Test
Mode
Mode I Ignition switch in
Diagnostic Test Mode I — Bulb Check
KEY and ENG.
Status
“ON” position
Engine stopped
Engine running
Function Explanation of Function
BULB CHECK This function checks the MIL bulb for damage (blown,
open circuit, etc.).
If the MIL does not come on, check MIL circuit.
MALFUNCTION
WARNING
This is a usual driving condition. When a malfunction is
detected twice in two consecutive driving cycles (two trip
detection logic), the MIL will light up to inform the driver
that a malfunction has been detected.
The following malfunctions will light up or blink the MIL in
the 1st trip.
I Coolant overtemperature enrichment protection
I “Misfire (Possible three way catalyst damage)”
I “Closed loop control”
I Fail-safe mode
NCEC0032S0102
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to
EL-98, “WARNING LAMPS” or see EC-610.
Diagnostic Test Mode I — Malfunction Warning
MIL Condition
NCEC0032S0103
ON When the malfunction is detected or the ECM’s CPU is malfunctioning.
OFF No malfunction.
EC-82
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart
EXIT
EXIT
OBD System Operation Chart
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
I When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
I When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on. For details, refer to “Two Trip Detection Logic” on
EC-67.
I The MIL will go off after the vehicle is driven 3 times with no malfunction. The drive is counted only when
the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting,
the counter will reset.
I The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel
Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS”
mode of CONSULT-II will count the number of times the vehicle is driven.
I The 1st trip DTC is not displayed when the self-diagnosis results in “OK” for the 2nd trip.
SUMMARY CHART
Items Fuel Injection System Misfire Other
MIL (goes off) 3 (pattern B) 3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no
display)
1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B)
1st Trip Freeze Frame Data
(clear)
For details about patterns “B” and “C” under “Fuel Injection System” and “Misfire”, see EC-85.
For details about patterns “A” and “B” under “Other”, see EC-87.
*1: Clear timing is at the moment OK is detected.
*2: Clear timing is when the same malfunction is detected in the 2nd trip.
80 (pattern C) 80 (pattern C) 40 (pattern A)
*1, *2 *1, *2 1 (pattern B)
=NCEC0033
NCEC0033S01
NCEC0033S02
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EC-83
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart (Cont’d)
RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR
“MISFIRE” <EXHAUST QUALITY DETERIORATION>, “FUEL INJECTION SYSTEM”
=NCEC0033S03
EXIT
EXIT
*1: When the same malfunction is
detected in two consecutive trips,
MIL will light up.
*2: MIL will go off after vehicle is
driven 3 times (pattern B) without
any malfunctions.
*3: When the same malfunction is
detected in two consecutive trips,
the DTC and the freeze frame
data will be stored in ECM.
*4: The DTC and the freeze frame
data will not be displayed any
longer after vehicle is driven 80
times (pattern C) without the same
malfunction.
(The DTC and the freeze frame
data still remain in ECM.)
*5: When a malfunction is detected
for the first time, the 1st trip DTC
and the 1st trip freeze frame data
will be stored in ECM.
*6: The 1st trip DTC and the 1st trip
SEF392S
freeze frame data will be cleared
at the moment OK is detected.
*7: When the same malfunction is
detected in the 2nd trip, the 1st
trip freeze frame data will be
cleared.
*8: 1st trip DTC will be cleared when
vehicle is driven once (pattern C)
without the same malfunction after
DTC is stored in ECM.
EC-84
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart (Cont’d)
EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”
Driving Pattern B
Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.
I The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.
I The B counter will be counted up when driving pattern B is satisfied without any malfunction.
I The MIL will go off when the B counter reaches 3. (*2 in “OBD SYSTEM OPERATION CHART”)
=NCEC0033S04
NCEC0033S0401
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Driving Pattern C
Driving pattern C means the vehicle operation as follows:
1) The following conditions should be satisfied at the same time:
Engine speed: (Engine speed in the freeze frame data) ±375 rpm
Calculated load value: (Calculated load value in the freeze frame data) × (1±0.1) [%]
Engine coolant temperature (T) condition:
I When the freeze frame data shows lower than 70°C (158°F), “T” should be lower than 70°C (158°F).
I When the freeze frame data shows higher than or equal to 70°C (158°F), “T” should be higher than or
equal to 70°C (158°F).
Example:
If the stored freeze frame data is as follows:
Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)
To be satisfied with driving pattern C, the vehicle should run under the following conditions:
Engine speed: 475 - 1,225 rpm, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70°C
(158°F)
I The C counter will be cleared when the malfunction is detected regardless of (1).
I The C counter will be counted up when (1) is satisfied without the same malfunction.
I The DTC will not be displayed after C counter reaches 80.
I The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC
is stored in ECM.
NCEC0033S0402
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EC-85
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ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart (Cont’d)
RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT
FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”
NCEC0033S05
EXIT
EXIT
*1: When the same malfunction is
detected in two consecutive trips,
MIL will light up.
*2: MIL will go off after vehicle is
driven 3 times (pattern B) without
any malfunctions.
*3: When the same malfunction is
detected in two consecutive trips,
the DTC and the freeze frame
data will be stored in ECM.
*4: The DTC and the freeze frame
data will not be displayed any
longer after vehicle is driven 40
times (pattern A) without the same
malfunction.
(The DTC and the freeze frame
data still remain in ECM.)
*5: When a malfunction is detected
for the first time, the 1st trip DTC
SEF393S
and the 1st trip freeze frame data
will be stored in ECM.
*6: 1st trip DTC will be cleared after
vehicle is driven once (pattern B)
without the same malfunction.
*7: When the same malfunction is
detected in the 2nd trip, the 1st
trip freeze frame data will be
cleared.
EC-86
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD System Operation Chart (Cont’d)
EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”
Driving Pattern A
NCEC0033S0601
NCEC0033S06
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I The A counter will be cleared when the malfunction is detected regardless of (1) - (4).
I The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.
I The DTC will not be displayed after the A counter reaches 40.
Driving Pattern B
Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.
I The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.
I The B counter will be counted up when driving pattern B is satisfied without any malfunctions.
I The MIL will go off when the B counter reaches 3 (*2 in “OBD SYSTEM OPERATION CHART”).
AEC574
NCEC0033S0602
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EC-87
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CONSULT-II
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EXIT
EXIT
SAT845J
PBR455D
CONSULT-II
CONSULT-II INSPECTION PROCEDURE
=NCEC0504
NCEC0504S01
1. Turn ignition switch OFF.
2. Connect CONSULT-II to data link connector, which is located
under LH dash panel near the fuse box cover.
3. Turn ignition switch ON.
4. Touch “START”.
5. Touch “ENGINE”.
SEF995X
6. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation
Manual.
SEF949Y
EC-88
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
ENGINE CONTROL COMPONENT PARTS/CONTROL
SYSTEMS APPLICATION
DIAGNOSTIC TEST MODE
CONSULT-II (Cont’d)
NCEC0504S02
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EXIT
SELF-DIAGNOSTIC
Item
Camshaft position sensor XXXX
Crankshaft position sensor
(OBD)
Mass air flow sensor X X X
Engine coolant temperature sen-
sor
Front heated oxygen sensor X X X X X
Rear heated oxygen sensor X X X X X
Vehicle speed sensor XXXX
Throttle position sensor XXXX
Fuel tank temperature sensor X X X X
EVAP control system pressure
sensor
Absolute pressure sensor X X X
WORK
SUP-
PORT
RESULTS
FREEZE
DTC*1
X
XXXXX
XXX
FRAME
DATA*2
DATA
MONI-
TOR
DATA
MONI-
TOR
(SPEC)
ACTIVE
TEST
DTC & SRT
CONFIRMATION
DTC
SRT
STATUS
WORK
SUP-
PORT
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EGR temperature sensor X X X
INPUT
Intake air temperature sensor XXXX
Knock sensor X
Ignition switch (start signal) X X
Closed throttle position switch X X X
ENGINE CONTROL COMPONENT PARTS
Closed throttle position switch
(throttle position sensor signal)
Air conditioner switch X X
Park/neutral position (PNP)
switch
Power steering oil pressure
switch
Battery voltage X X
Load signal X X
Fuel level sensor X X X
XX
XXX
XX
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EC-89
CONSULT-II (Cont’d)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
DIAGNOSTIC TEST MODE
EXIT
EXIT
SELF-DIAGNOSTIC
Item
Injectors X X X
Power transistor (Ignition timing) X
IACV-AAC valve X X X X
EVAP canister purge volume
control solenoid valve
Air conditioner relay X X
Fuel pump relay X X X X
Cooling fan X X X X
OUTPUT
EGR volume control valve X X X X
Front heated oxygen sensor
heater
Rear heated oxygen sensor
heater
ENGINE CONTROL COMPONENT PARTS
EVAP canister vent control valve X X X X
WORK
SUP-
PORT
RESULTS
FREEZE
DTC*1
X
(Ignition
signal)
X XXX X
XXXX
XXXX
FRAME
DATA*2
DATA
MONI-
TOR
XXX
MONI-
(SPEC)
DATA
TOR
ACTIVE
TEST
DTC & SRT
CONFIRMATION
DTC
SRT
STATUS
WORK
SUP-
PORT
Vacuum cut valve bypass valve X X X X X
Calculated load value X X X
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-68.
EC-90
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EXIT
EXIT
FUNCTION
Diagnostic test mode Function
Work support
Self-diagnostic results
Data monitor Input/Output data in the ECM can be read.
Data monitor (spec)
Active test
DTC & SRT confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECM part number ECM part number can be read.
*1 The following emission-related diagnostic information is cleared when the ECM memory is erased.
1) Diagnostic trouble codes
2) 1st trip diagnostic trouble codes
3) Freeze frame data
4) 1st trip freeze frame data
5) System readiness test (SRT) codes
6) Test values
7) Others
This mode enables a technician to adjust some devices faster and more accurately by following the
indications on the CONSULT-II unit.
Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame
data can be read and erased quickly.*1
Input/Output specifications of the basic fuel schedule, AFM, A/F feedback control value and the
other data monitor items can be read.
Diagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also
shifts some parameters in a specified range.
WORK SUPPORT MODE
WORK ITEM CONDITION USAGE
IGNITION TIMING ADJ I IGNITION TIMING FEEDBACK CONTROL WILL BE
HELD BY TOUCHING “START”. AFTER DOING SO,
ADJUST IGNITION TIMING WITH A TIMING LIGHT BY
TURNING THE CAMSHAFT POSITION SENSOR.
When adjusting initial ignition timing
=NCEC0504S03
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FUEL PRESSURE RELEASE I FUEL PUMP WILL STOP BY TOUCHING “START”
EVAP SYSTEM CLOSE OPEN THE VACUUM CUT VALVE BYPASS VALVEAND
TARGET IDLE RPM ADJ* I IDLE CONDITION When setting target idle speed
*: This function is not necessary in the usual service procedure.
DURING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.
CLOSE THE EVAP CANISTER VENT CONTROL VALVE
IN ORDER TO MAKE EVAP SYSTEM CLOSE UNDER
THE FOLLOWING CONDITIONS.
I IGN SW “ON”
I ENGINE NOT RUNNING
I AMBIENT TEMPERATURE IS ABOVE 0°C (32°F).
I NO VACUUM AND NO HIGH PRESSURE IN EVAP
SYSTEM
I TANK FUEL TEMP. IS MORE THAN 0°C (32°F).
I WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”
I WHEN TRYING TO EXECUTE “EVAP SYSTEM
CLOSE” UNDER THE CONDITION EXCEPT ABOVE,
CONSULT-II WILL DISCONTINUE IT AND DISPLAY
APPROPRIATE INSTRUCTION.
NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY “BATTERY VOLTAGE IS LOW. CHARGE
BATTERY”, EVEN IN USING CHARGED BATTERY.
When releasing fuel pressure
from fuel line
When detecting EVAP vapor leak
point of EVAP system
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EC-91
CONSULT-II (Cont’d)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EXIT
EXIT
SELF-DIAGNOSTIC MODE
DTC and 1st Trip DTC
Regarding items of “DTC and 1st trip DTC”, refer to “TROUBLE
DIAGNOSIS — INDEX” (See EC-8.)
Freeze Frame Data and 1st Trip Freeze Frame Data
Freeze frame data
item*1
DIAG TROUBLE
CODE
[PXXXX]
FUEL SYS-B1
CAL/LD VALUE [%] I The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP [°C]
or [°F]
S-FUEL TRIM-B1 [%]
I The engine control component part/control system has a trouble code, it is displayed as “PXXXX”.
(Refer to “TROUBLE DIAGNOSIS — INDEX”, EC-8.)
I “Fuel injection system status” at the moment a malfunction is detected is displayed.
I One mode in the following is displayed.
“MODE 2”: Open loop due to detected system malfunction
“MODE 3”: Open loop due to driving conditions (power enrichment, deceleration enrichment)
“MODE 4”: Closed loop - using oxygen sensor(s) as feedback for fuel control
“MODE 5”: Open loop - has not yet satisfied condition to go to closed loop
I The engine coolant temperature at the moment a malfunction is detected is displayed.
I “Short-term fuel trim” at the moment a malfunction is detected is displayed.
I The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule.
Description
=NCEC0504S05
NCEC0504S0501
NCEC0504S0502
I “Long-term fuel trim” at the moment a malfunction is detected is displayed.
L-FUEL TRIM-B1 [%]
ENGINE SPEED
[rpm]
VHCL SPEED [km/h]
or [mph]
ABSOL TH-P/S
[degree] or [%]
B/FUEL SCHDL
[msec]
INT/A TEMP SE [°C]
or [°F]
*1: The items are the same as those of 1st trip freeze frame data.
I The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim.
I The engine speed at the moment a malfunction is detected is displayed.
I The vehicle speed at the moment a malfunction is detected is displayed.
I The throttle valve opening angle at the moment a malfunction is detected is displayed.
I The base fuel schedule at the moment a malfunction is detected is displayed.
I The intake air temperature at the moment a malfunction is detected is displayed.
EC-92
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EXIT
EXIT
ECM
Monitored item [Unit]
ENG SPEED [rpm] qq
MAS A/F SE-B1 [V] qq
COOLAN TEMP/S
[°C] or [°F]
FR O2 SEN-B1 [V] qq
RR O2 SEN-B1 [V] q
FR O2 MNTR-B1
[RICH/LEAN]
RR O2 MNTR-B1
[RICH/LEAN]
input
signals
qq
q
q
VHCL SPEED SE
[km/h] or [mph]
BATTERY VOLT [V] q
THRTL POS SEN [V] qq
qq
Main
signals
DATA MONITOR MODE
Description Remarks
I Indicates the engine speed computed
from the REF signal (180° signal) of the
camshaft position sensor.
I The signal voltage of the mass air flow
sensor is displayed.
I The engine coolant temperature (deter-
mined by the signal voltage of the
engine coolant temperature sensor) is
displayed.
I The signal voltage of the front heated
oxygen sensor is displayed.
I The signal voltage of the rear heated
oxygen sensor is displayed.
I Display of front heated oxygen sensor
signal during air-fuel ratio feedback
control:
RICH ... means the mixture became
“rich”, and control is being affected
toward a leaner mixture.
LEAN ... means the mixture became
“lean”, and control is being affected
toward a rich mixture.
I Display of rear heated oxygen sensor
signal:
RICH ... means the amount of oxygen
after three way catalyst is relatively
small.
LEAN ... means the amount of oxygen
after three way catalyst is relatively
large.
I The vehicle speed computed from the
vehicle speed sensor signal is displayed.
I The power supply voltage of ECM is
displayed.
I The throttle position sensor signal volt-
age is displayed.
=NCEC0504S06
I When the engine is stopped, a certain
value is indicated.
I When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine coolant temperature determined by the
ECM is displayed.
I After turning ON the ignition switch,
“RICH” is displayed until air-fuel mixture
ratio feedback control begins.
I When the air-fuel ratio feedback is
clamped, the value just before the
clamping is displayed continuously.
I When the engine is stopped, a certain
value is indicated.
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FUEL T/TMP SE
[°C] or [°F]
INT/A TEMP SE
[°C] or [°F]
EGR TEMP SEN [V] qq
START SIGNAL
[ON/OFF]
q
qq
I The fuel temperature judged from the
I The intake air temperature determined
I The signal voltage of the EGR tem-
I Indicates [ON/OFF] condition from the
tank fuel temperature sensor signal
voltage is displayed.
by the signal voltage of the intake air
temperature sensor is indicated.
perature sensor is displayed.
starter signal.
EC-93
I After starting the engine, [OFF] is dis-
played regardless of the starter signal.
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CONSULT-II (Cont’d)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EXIT
EXIT
Monitored item [Unit]
CLSD THL/P SW
[ON/OFF]
CLSD THL POS
[ON/OFF]
AIR COND SIG
[ON/OFF]
P/N POSI SW
[ON/OFF]
PW/ST SIGNAL
[ON/OFF]
IGNITION SW
[ON/OFF]
INJ PULSE-B1
[msec]
ECM
input
signals
qq
qq
qq
qq
q
Main
signals
q
Description Remarks
I Indicates mechanical contact [ON/OFF]
condition of the closed throttle position
switch.
I Indicates idle position [ON/OFF] com-
puted by ECM according to the throttle
position sensor signal.
I Indicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.
I Indicates [ON/OFF] condition from the
park/neutral position (PNP) switch signal.
I [ON/OFF] condition of the power steer-
ing oil pressure switch determined by
the power steering oil pressure signal is
indicated.
I Indicates [ON/OFF] condition from igni-
tion switch.
I Indicates the actual fuel injection pulse
width compensated by ECM according
to the input signals.
I When the engine is stopped, a certain
computed value is indicated.
B/FUEL SCHDL
[msec]
IGN TIMING [BTDC] q
IACV-AAC/V [step] q
PURG VOL C/V [%]
A/F ALPHA-B1 [%] q
EVAP SYS PRES [V]
AIR COND RLY
[ON/OFF]
I “Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board
correction.
I Indicates the ignition timing computed
by ECM according to the input signals.
I Indicates the IACV-AAC valve control
value computed by ECM according to
the input signals.
I Indicates the EVAP canister purge vol-
ume control solenoid valve control
value computed by the ECM according
to the input signals.
I The opening becomes larger as the
value increases.
I The mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.
I The signal voltage of EVAP control sys-
tem pressure sensor is displayed.
I The air conditioner relay control condi-
q
tion (determined by ECM according to
the input signal) is indicated.
I When the engine is stopped, a certain
value is indicated.
I When the engine is stopped, a certain
value is indicated.
I This data also includes the data for the
air-fuel ratio learning control.
FUEL PUMP RLY
[ON/OFF]
I Indicates the fuel pump relay control
q
condition determined by ECM according to the input signals.
EC-94
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EXIT
EXIT
ECM
Monitored item [Unit]
COOLING FAN
[ON/OFF]
EGR VOL CON/V
[step]
VENT CONT/V
[ON/OFF]
FR O2 HTR-B1
[ON/OFF]
RR O2 HTR-B1
[ON/OFF]
VC/V BYPASS/V
[ON/OFF]
input
signals
CAL/LD VALUE [%]
Main
signals
q
q
Description Remarks
I Indicates the control condition of the
cooling fan (determined by ECM
according to the input signal).
HIGH ... High speed operation
LOW ... Low speed operation
OFF ... Stop
I Indicates the EGR volume control value
computed by the ECM according to the
input signals.
I The opening becomes larger as the
value increases.
I The control condition of the EVAP can-
ister vent control valve (determined by
ECM according to the input signal) is
indicated.
I ON ... Closed
OFF ... Open
I Indicates [ON/OFF] condition of front
heated oxygen sensor heater determined by ECM according to the input
signals.
I Indicates [ON/OFF] condition of rear
heated oxygen sensor heater determined by ECM according to the input
signals.
I The control condition of the vacuum cut
valve bypass valve (determined by
ECM according to the input signal) is
indicated.
I ON ... Open
OFF ... Closed
I “Calculated load value” indicates the
value of the current airflow divided by
peak airflow.
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ABSOL TH·P/S
[degree] or [%]
MASS AIRFLOW
[g·m/s]
ABSOL PRES/SE [V]
LOAD SIGNAL
[ON/OFF]
TRVL AFTER MIL
[km] or [Mile]
I “Absolute throttle position sensor” indi-
I Indicates the mass airflow computed by
I The signal voltage of the absolute pres-
I Indicates [ON/OFF] condition from the
qq
I Distance traveled while MIL is activated
cates the throttle valve opening angle
computed by ECM according to the signal voltage of the throttle position sensor.
ECM according to the signal voltage of
the mass airflow sensor.
sure sensor is displayed.
electrical load signal and/or lighting
switch.
ON ... rear defogger is operating and/or
lighting switch is on.
OFF ... rear defogger is not operating
and lighting switch is not on.
EC-95
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CONSULT-II (Cont’d)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EXIT
EXIT
ECM
Monitored item [Unit]
FUEL LEVEL SE [V]
IDL A/V LEAN
Voltage [V]
Frequenty
[msec] or [Hz] or [%]
NOTE:
I Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
input
signals
Main
signals
Description Remarks
I The signal voltage of the fuel level sen-
sor is displayed.
I Display the condition of idle air volume
learning
YET ... Idle air volume learning has not
been performed yet.
CMPLT ... Idle air volume learning has
already been performed successfully.
INCMP ... Idle air volume learning has
not been performed successfully.
I Voltage measured by the voltage
probe.
I Pulse width, frequency or duty cycle
measured by the pulse probe.
I Only “#” is displayed if item is unable to
be measured.
I Figures with “#”s are temporary ones.
They are the same figures as an actual
piece of data which was just previously
measured.
DATA MONITOR (SPEC) MODE
Monitored item [Unit]
ECM
input
signals
Main
signals
Description Remarks
NCEC0504S11
MAS A/F SE-B1 [V] qq
B/FUEL SCHDL
[msec]
A/F ALPHA-B1 [%] q
NOTE:
I Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
I The signal voltage of the mass air flow
sensor specification is displayed.
I “Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board
correction.
I The mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.
I When engine is running specification
range is indicated.
I When engine is running specification
range is indicated.
I When engine is running specification
range is indicated.
I This data also includes the data for the
air-fuel ratio learning control.
ACTIVE TEST MODE
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
FUEL INJECTION
IACV-AAC/V
OPENING
I Engine: Return to the original
trouble condition
I Change the amount of fuel injec-
tion using CONSULT-II.
I Engine: After warming up, idle
the engine.
I Change the IACV-AAC valve
opening percent using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
Engine speed changes according
to the opening percent.
I Harness and connector
I Fuel injectors
I Front heated oxygen sensor
I Harness and connector
I IACV-AAC valve
NCEC0504S07
ENG COOLANT
TEMP
I Engine: Return to the original
trouble condition
I Change the engine coolant tem-
perature using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
EC-96
I Harness and connector
I Engine coolant temperature sen-
sor
I Fuel injectors
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
EXIT
EXIT
I Engine: Return to the original
trouble condition
IGNITION TIMING
POWER BALANCE
COOLING FAN
FUEL PUMP
RELAY
EGR VOL
CONT/V
SELF-LEARNING
CONT
PURG VOL
CONT/V
FUEL/T TEMP
SEN
VENT
CONTROL/V
I Timing light: Set
I Retard the ignition timing using
CONSULT-II.
I Engine: After warming up, idle
the engine.
I A/C switch “OFF”
I Shift lever “N”
I Cut off each injector signal one
at a time using CONSULT-II.
I Ignition switch: ON
I Turn the cooling fan “ON” and
“OFF” using CONSULT-II.
I Ignition switch: ON
(Engine stopped)
I Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II
and listen to operating sound.
I Ignition switch: ON
(Engine stopped)
I Change EGR volume control
valve opening step using CONSULT-II.
I In this test, the coefficient of self-learning control mixture ratio returns to the original coefficient by touching
“CLEAR” or “START” on the screen.
I Engine: After warming up, run
engine at 1,500 rpm.
I Change the EVAP canister purge
volume control solenoid valve
opening percent using CONSULT-II.
I Change the fuel tank temperature using CONSULT-II.
I Ignition switch: ON
(Engine stopped)
I Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.
If trouble symptom disappears, see
CHECK ITEM.
Engine runs rough or dies.
Cooling fan moves and stops.
Fuel pump relay makes the operating sound.
EGR volume control valve makes
an operating sound.
Engine speed changes according
to the opening percent.
Solenoid valve makes an operating
sound.
I Adjust initial ignition timing
I Harness and connector
I Compression
I Injectors
I Power transistor
I Spark plugs
I Ignition coils
I Harness and connector
I Cooling fan motor
I Cooling fan relay
I Harness and connector
I Fuel pump relay
I Harness and connector
I EGR volume control valve
I Harness and connector
I Solenoid valve
I Harness and connector
I Solenoid valve
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
VC/V BYPASS/V
IDLE AIR VOL
LEARN
I Ignition switch: ON
(Engine stopped)
I Turn solenoid valve “ON” and
“OFF” with the CONSULT-II and
listen to operating sound.
I In this test, the idle air volume that keeps the engine within the specified range is memorized in ECM.
Solenoid valve makes an operating
sound.
I Harness and connector
I Solenoid valve
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
For details, refer to “SYSTEM READINESS TEST (SRT) CODE”,
EC-69.
SRT Work Support Mode
This mode enables a technician to drive a vehicle to set the SRT
while monitoring the SRT status.
NCEC0504S0801
NCEC0504S0802
EC-97
NCEC0504S08
BT
HA
SC
EL
IDX
CONSULT-II (Cont’d)
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
EXIT
EXIT
DTC Work Support Mode
Test mode Test item Condition Reference page
EVAP SML LEAK P0440
EVAP SML LEAK P1440 EC-500
EVAPORATIVE SYSTEM
FR O2 SENSOR
RR O2 SENSOR
EGR SYSTEM
PURG VOL CN/V P1444 EC-502
PURGE FLOW P1447 EC-522
VC CUT/V BP/V P1491 EC-553
FR O2 SEN-B1 P0130 EC-197
FR O2 SEN-B1 P0131 EC-205
FR O2 SEN-B1 P0132 EC-211
FR O2 SEN-B1 P0133 EC-218
RR O2 SEN-B1 P0137 EC-238
RR O2 SEN-B1 P0138 EC-246
RR O2 SEN-B1 P0139 EC-254
EGR SYSTEM P0400 EC-335
EGR SYSTEM P1402 EC-490
Refer to corresponding
trouble diagnosis for
DTC.
NCEC0504S0803
EC-356
SEF706X
SEF707X
REAL TIME DIAGNOSIS IN DATA MONITOR MODE
(RECORDING VEHICLE DATA)
CONSULT-II has two kinds of triggers and they can be selected by
touching “SETTING” in “DATA MONITOR” mode.
1) “AUTO TRIG” (Automatic trigger):
I The malfunction will be identified on the CONSULT-II screen in
real time.
In other words, DTC/1st trip DTC and malfunction item will be
displayed if the malfunction is detected by ECM.
At the moment a malfunction is detected by ECM, “MONITOR”
in “DATAMONITOR” screen is changed to “Recording Data ...
xx%” as shown at left, and the data after the malfunction detection is recorded. Then when the percentage reached 100%,
“REAL-TIME DIAG” screen is displayed. If “STOP” is touched
on the screen during “ Recording Data ... xx%”, “REAL-TIME
DIAG” screen is also displayed.
The recording time after the malfunction detection and the
recording speed can be changed by “TRIGGER POINT” and
“Recording Speed”. Refer to CONSULT-II OPERATION
MANUAL.
2) “MANU TRIG” (Manual trigger):
I DTC/1st trip DTC and malfunction item will not be displayed
NCEC0504S09
EC-98
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
automatically on CONSULT-II screen even though a malfunction is detected by ECM.
DATA MONITOR can be performed continuously even though
a malfunction is detected.
Use these triggers as follows:
1) “AUTO TRIG”
I While trying to detect the DTC/1st trip DTC by performing the
“DTC Confirmation Procedure”, be sure to select to “DATA
MONITOR (AUTO TRIG)” mode. Youcan confirm the malfunction at the moment it is detected.
I While narrowing down the possible causes, CONSULT-II
should be set in “DATAMONITOR (AUTO TRIG)” mode, especially in case the incident is intermittent.
When you are inspecting the circuit by gently shaking (or twisting) the suspicious connectors, components and harness in
the “DTC Confirmation Procedure”, the moment a malfunction
is found the DTC/1st trip DTC will be displayed. (Refer to
GI-26, “Incident Simulation Tests”.)
2) “MANU TRIG”
I If the malfunction is displayed as soon as “DATA MONITOR”
is selected, reset CONSULT-II to “MANU TRIG”. By selecting
“MANU TRIG” you can monitor and store the data. The data
can be utilized for further diagnosis, such as a comparison with
the value for the normal operating condition.
CONSULT-II (Cont’d)
GI
MA
EM
LC
FE
CL
MT
EXIT
EXIT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EC-99
EL
SEF714Y
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Generic Scan Tool (GST)
EXIT
EXIT
SEF139P
SAT845J
Generic Scan Tool (GST)
DESCRIPTION
=NCEC0035
NCEC0035S01
Generic Scan Tool (OBDII scan tool) complying with SAE J1978
has 7 different functions explained on the next page.
ISO9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service
manual.
GST INSPECTION PROCEDURE
NCEC0035S02
1. Turn ignition switch OFF.
2. Connect “GST” to data link connector for GST. (Data link connector for GST is located under LH dash panel near the fuse
box cover.)
3. Turn ignition switch ON.
4. Enter the program according to instruction on the screen or in
the operation manual.
(*: Regarding GST screens in this section, sample screens are
shown.)
SEF398S
5. Perform each diagnostic mode according to each service procedure.
For further information, see the GST Operation Manual of the
tool maker.
SEF416S
EC-100
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