Nissan Pathfinder 2001 User Manual

Name: Nissan Pathfinder 2001
Brand: Nissan
SKU: 3849026
Rating: 4.5 (2 reviews)

4.5 (2)

ENGINE CONTROL SYSTEM

SECTION EC

MODIFICATION NOTICE:

IThe SMART C/U - PREVIOUS is applicable for the 2WD models up to serial number 567231 and for the 4WD models up to serial number 584967.

IThe SMART C/U - NEW is applicable for the 2WD models from serial number 567231 and for the 4WD FE models from serial number 584967.

CONTENTS

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
Electronic Ignition (EI) System ..................................	31
Air Conditioning Cut Control......................................	32
Fuel Cut Control (at no load & high engine
speed) ........................................................................	33
Evaporative Emission System ...................................	33
Positive Crankcase Ventilation ..................................	39
BASIC SERVICE PROCEDURE ...................................	40
Fuel Pressure Release ..............................................	40
Fuel Pressure Check .................................................	40
Fuel Pressure Regulator Check ................................	41
Injector .......................................................................	42
How to Check Idle Speed and Ignition Timing..........	43

Idle Speed/Ignition Timing/Idle Mixture Ratio		AT
Adjustment .................................................................	44	AT
Idle Air Volume Learning ...........................................	59
ON BOARD DIAGNOSTIC SYSTEM		TF
DESCRIPTION ...............................................................	61	TF
Introduction ................................................................	61
Two Trip Detection Logic ...........................................	61	PD
Emission-related Diagnostic Information ...................	62
Malfunction Indicator Lamp (MIL)..............................	76	AX
OBD System Operation Chart ...................................	77	AX
CONSULT-II ...............................................................	83
Generic Scan Tool (GST) ..........................................	97	SU
TROUBLE DIAGNOSIS - INTRODUCTION..................	99	SU
Introduction ................................................................	99
Work Flow................................................................	101	BR
TROUBLE DIAGNOSIS - BASIC INSPECTION .........	103
Basic Inspection.......................................................	103	ST
TROUBLE DIAGNOSIS - GENERAL		ST
DESCRIPTION .............................................................	116
DTC Inspection Priority Chart..................................	116	RS
Fail-safe Chart .........................................................	117	RS
Symptom Matrix Chart.............................................	118
CONSULT-II Reference Value in Data Monitor		BT
Mode ........................................................................	122	BT
Major Sensor Reference Graph in Data Monitor
Mode ........................................................................	124	HA
ECM Terminals and Reference Value .....................	127
TROUBLE DIAGNOSIS - SPECIFICATION VALUE ..	136	SC
Description ...............................................................	136	SC
Testing Condition .....................................................	136
Inspection Procedure...............................................	136	EL
Diagnostic Procedure ..............................................	137	EL
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................	140	IDX
Description ...............................................................	140
Diagnostic Procedure ..............................................	140

CONTENTS (Cont'd)

TROUBLE DIAGNOSIS FOR POWER SUPPLY........	141
ECM Terminals and Reference Value .....................	141
Main Power Supply and Ground Circuit..................	142
DTC P0100 MASS AIR FLOW SENSOR (MAFS)......	150
Component Description ...........................................	150
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	150
ECM Terminals and Reference Value .....................	150
On Board Diagnosis Logic.......................................	151
Possible Cause........................................................	151
DTC Confirmation Procedure ..................................	151
Overall Function Check ...........................................	153
Wiring Diagram ........................................................	154
Diagnostic Procedure ..............................................	155
DTC P0105 ABSOLUTE PRESSURE SENSOR ........	158
Component Description ...........................................	158
On Board Diagnosis Logic.......................................	158
DTC Confirmation Procedure ..................................	158
Diagnostic Procedure ..............................................	159
DTC P0110 INTAKE AIR TEMPERATURE
SENSOR ......................................................................	160
Component Description ...........................................	160
On Board Diagnosis Logic.......................................	160
Possible Cause........................................................	160
DTC Confirmation Procedure ..................................	160
Wiring Diagram ........................................................	162
Diagnostic Procedure ..............................................	163
DTC P0115 ENGINE COOLANT TEMPERATURE
SENSOR (ECTS) (CIRCUIT) .......................................	165
Component Description ...........................................	165
On Board Diagnosis Logic.......................................	165
Possible Cause........................................................	166
DTC Confirmation Procedure ..................................	166
Wiring Diagram ........................................................	167
Diagnostic Procedure ..............................................	168
DTC P0120 THROTTLE POSITION SENSOR ...........	170
Description ...............................................................	170
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	170
ECM Terminals and Reference Value .....................	171
On Board Diagnosis Logic.......................................	171
Possible Cause........................................................	171
DTC Confirmation Procedure ..................................	172
Wiring Diagram ........................................................	176
Diagnostic Procedure ..............................................	177
DTC P0125 ENGINE COOLANT TEMPERATURE
SENSOR (ECTS) .........................................................	182
Description ...............................................................	182
On Board Diagnosis Logic.......................................	182
Possible Cause........................................................	183
DTC Confirmation Procedure ..................................	183
Wiring Diagram ........................................................	184

Diagnostic Procedure ..............................................	185
DTC P0130, P0150 HEATED OXYGEN SENSOR 1
(FRONT) (BANK 1)/(BANK 2) (CIRCUIT) ..................	187
Component Description ...........................................	187
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	187
ECM Terminals and Reference Value .....................	187
On Board Diagnosis Logic.......................................	188
Possible Cause........................................................	188
DTC Confirmation Procedure ..................................	189
Overall Function Check ...........................................	189
Wiring Diagram ........................................................	191
Diagnostic Procedure ..............................................	193
DTC P0131, P0151 HEATED OXYGEN SENSOR 1
(FRONT) (BANK 1)/(BANK 2) (LEAN SHIFT
MONITORING) .............................................................	197
Component Description ...........................................	197
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	197
ECM Terminals and Reference Value .....................	197
On Board Diagnosis Logic.......................................	198
Possible Cause........................................................	198
DTC Confirmation Procedure ..................................	198
Overall Function Check ...........................................	199
Diagnostic Procedure ..............................................	200
DTC P0132, P0152 HEATED OXYGEN SENSOR 1
(FRONT) (BANK 1)/(BANK 2) (RICH 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
Possible Cause........................................................	206
DTC Confirmation Procedure ..................................	206
Overall Function Check ...........................................	207
Diagnostic Procedure ..............................................	208
DTC P0133, P0153 HEATED OXYGEN SENSOR 1
(FRONT) (BANK 1)/(BANK 2) (RESPONSE
MONITORING) .............................................................	213
Component Description ...........................................	213
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	213
ECM Terminals and Reference Value .....................	213
On Board Diagnosis Logic.......................................	214
Possible Cause........................................................	214
DTC Confirmation Procedure ..................................	215
Overall Function Check ...........................................	216
Wiring Diagram ........................................................	217
Diagnostic Procedure ..............................................	219
DTC P0134, P0154 HEATED OXYGEN SENSOR 1
(FRONT) (BANK 1)/(BANK 2) (HIGH VOLTAGE)......	226

EC-2

CONTENTS (Cont'd)

Component Description ...........................................	226
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	226
ECM Terminals and Reference Value .....................	226
On Board Diagnosis Logic.......................................	227
Possible Cause........................................................	227
DTC Confirmation Procedure ..................................	227
Wiring Diagram ........................................................	229
Diagnostic Procedure ..............................................	231
DTC P0135, P0155 HEATED OXYGEN SENSOR 1
HEATER (FRONT) (BANK 1)/(BANK 2).....................	235
Description ...............................................................	235
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	235
ECM Terminals and Reference Value .....................	235
On Board Diagnosis Logic.......................................	236
Possible Cause........................................................	236
DTC Confirmation Procedure ..................................	236
Wiring Diagram ........................................................	237
Diagnostic Procedure ..............................................	239
DTC P0137, P0157 HEATED OXYGEN SENSOR 2
(REAR) (BANK 1)/(BANK 2) (MIN. VOLTAGE
MONITORING) .............................................................	242
Component Description ...........................................	242
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	242
ECM Terminals and Reference Value .....................	242
On Board Diagnosis Logic.......................................	242
Possible Cause........................................................	243
DTC Confirmation Procedure ..................................	243
Overall Function Check ...........................................	243
Wiring Diagram ........................................................	245
Diagnostic Procedure ..............................................	247
DTC P0138, P0158 HEATED OXYGEN SENSOR 2
(REAR) (BANK 1)/(BANK 2) (MAX. VOLTAGE
MONITORING) .............................................................	252
Component Description ...........................................	252
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	252
ECM Terminals and Reference Value .....................	252
On Board Diagnosis Logic.......................................	252
Possible Cause........................................................	253
DTC Confirmation Procedure ..................................	253
Overall Function Check ...........................................	253
Wiring Diagram ........................................................	255
Diagnostic Procedure ..............................................	257
DTC P0139, P0159 HEATED OXYGEN SENSOR 2
(REAR) (BANK 1)/(BANK 2) (RESPONSE
MONITORING) .............................................................	262
Component Description ...........................................	262
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	262

ECM Terminals and Reference Value .....................	262	MA
On Board Diagnosis Logic.......................................	262	MA
Possible Cause........................................................	263
DTC Confirmation Procedure ..................................	263	EM
Overall Function Check ...........................................	263	EM
Wiring Diagram ........................................................	265
Diagnostic Procedure ..............................................	267	LC
DTC P0140, P0160 HEATED OXYGEN SENSOR 2
(REAR) (BANK 1)/(BANK 2) (HIGH VOLTAGE)........	272
Component Description ...........................................	272
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	272	FE
ECM Terminals and Reference Value .....................	272	FE
On Board Diagnosis Logic.......................................	272
Possible Cause........................................................	273	CL
DTC Confirmation Procedure ..................................	273
Overall Function Check ...........................................	273
Wiring Diagram ........................................................	275	MT
Diagnostic Procedure ..............................................	277
DTC P0141, P0161 HEATED OXYGEN SENSOR 2		AT
HEATER (REAR) (BANK 1)/(BANK 2).......................	281	AT
Description ...............................................................	281
CONSULT-II Reference Value in Data Monitor		TF
Mode ........................................................................	281	TF
ECM Terminals and Reference Value .....................	281
On Board Diagnosis Logic.......................................	282	PD
Possible Cause........................................................	282
DTC Confirmation Procedure ..................................	282	AX
Wiring Diagram ........................................................	284	AX
Diagnostic Procedure ..............................................	286
DTC P0171 (RIGHT, -B1), P0174 (LEFT, -B2)		SU
FUEL INJECTION SYSTEM FUNCTION (LEAN).......	289	SU
On Board Diagnosis Logic.......................................	289
Possible Cause........................................................	289	BR
DTC Confirmation Procedure ..................................	289
Wiring Diagram ........................................................	291
Diagnostic Procedure ..............................................	293	ST
DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2)
FUEL INJECTION SYSTEM FUNCTION (RICH)........	297	RS
On Board Diagnosis Logic.......................................	297	RS
Possible Cause........................................................	297
DTC Confirmation Procedure ..................................	297	BT
Wiring Diagram ........................................................	299	BT
Diagnostic Procedure ..............................................	301
DTC P0180 FUEL TANK TEMPERATURE	304	HA
SENSOR ......................................................................	304
Component Description ...........................................	304	SC
On Board Diagnosis Logic.......................................	304	SC
Possible Cause........................................................	304
DTC Confirmation Procedure ..................................	305	EL
Wiring Diagram ........................................................	306	EL
Diagnostic Procedure ..............................................	307

IDX

EC-3

CONTENTS (Cont'd)

DTC P0217 COOLANT OVERTEMPERATURE
ENRICHMENT PROTECTION.....................................	309
On Board Diagnosis Logic.......................................	309
Possible Cause........................................................	309
Overall Function Check ...........................................	309
Diagnostic Procedure ..............................................	311
Main 12 Causes of Overheating..............................	314
DTC P0300 - P0306 NO. 6 - 1 CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE ...............	315
On Board Diagnosis Logic.......................................	315
Possible Cause........................................................	315
DTC Confirmation Procedure ..................................	316
Diagnostic Procedure ..............................................	316
DTC P0325 KNOCK SENSOR (KS) ...........................	323
Component Description ...........................................	323
ECM Terminals and Reference Value .....................	323
On Board Diagnosis Logic.......................................	323
Possible Cause........................................................	323
DTC Confirmation Procedure ..................................	323
Wiring Diagram ........................................................	325
Diagnostic Procedure ..............................................	326
DTC P0335 CRANKSHAFT POSITION SENSOR
(CKPS) (POS) ..............................................................	329
Component Description ...........................................	329
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	329
ECM Terminals and Reference Value .....................	330
On Board Diagnosis Logic.......................................	330
Possible Cause........................................................	330
DTC Confirmation Procedure ..................................	331
Wiring Diagram ........................................................	332
Diagnostic Procedure ..............................................	333
DTC P0340 CAMSHAFT POSITION SENSOR
(CMPS) (PHASE).........................................................	337
Component Description ...........................................	337
ECM Terminals and Reference Value .....................	337
On Board Diagnosis Logic.......................................	337
Possible Cause........................................................	338
DTC Confirmation Procedure ..................................	338
Wiring Diagram ........................................................	339
Diagnostic Procedure ..............................................	340
DTC P0420 (RIGHT BANK, -B1), P0430 (LEFT
BANK, -B2) THREE WAY CATALYST FUNCTION ...	342
On Board Diagnosis Logic.......................................	342
Possible Cause........................................................	342
DTC Confirmation Procedure ..................................	343
Overall Function Check ...........................................	343
Diagnostic Procedure ..............................................	344
DTC P0440 EVAP CONTROL SYSTEM (SMALL
LEAK) (NEGATIVE PRESSURE)................................	347
On Board Diagnosis Logic.......................................	347
Possible Cause........................................................	347

DTC Confirmation Procedure ..................................	349
Diagnostic Procedure ..............................................	350
DTC P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE (CIRCUIT).................	362
Description ...............................................................	362
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	362
ECM Terminals and Reference Value .....................	363
On Board Diagnosis Logic.......................................	363
Possible Cause........................................................	363
DTC Confirmation Procedure ..................................	364
Wiring Diagram ........................................................	365
Diagnostic Procedure ..............................................	366
DTC P0446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CIRCUIT) ......	369
Component Description ...........................................	369
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	369
ECM Terminals and Reference Value .....................	369
On Board Diagnosis Logic.......................................	369
Possible Cause........................................................	370
DTC Confirmation Procedure ..................................	370
Wiring Diagram ........................................................	371
Diagnostic Procedure ..............................................	372
DTC P0450 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PRESSURE SENSOR ..............	376
Component Description ...........................................	376
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	376
ECM Terminals and Reference Value .....................	376
On Board Diagnosis Logic.......................................	377
Possible Cause........................................................	377
DTC Confirmation Procedure ..................................	377
Wiring Diagram ........................................................	379
Diagnostic Procedure ..............................................	380
DTC P0455 EVAP CONTROL SYSTEM (GROSS
LEAK)...........................................................................	389
On Board Diagnosis Logic.......................................	389
Possible Cause........................................................	389
DTC Confirmation Procedure ..................................	391
Diagnostic Procedure ..............................................	392
DTC P0460 FUEL LEVEL SENSOR FUNCTION
(SLOSH).......................................................................	402
Component Description ...........................................	402
On Board Diagnostic Logic......................................	402
Possible Cause........................................................	402
DTC Confirmation Procedure ..................................	402
Wiring Diagram ........................................................	403
Diagnostic Procedure ..............................................	404
DTC P0461 FUEL LEVEL SENSOR FUNCTION .......	406
Component Description ...........................................	406
On Board Diagnostic Logic......................................	406

EC-4

CONTENTS (Cont'd)

Possible Cause........................................................	406
Overall Function Check ...........................................	406
DTC P0464 FUEL LEVEL SENSOR CIRCUIT ...........	408
Component Description ...........................................	408
On Board Diagnostic Logic......................................	408
Possible Cause........................................................	408
DTC Confirmation Procedure ..................................	408
Wiring Diagram ........................................................	409
Diagnostic Procedure ..............................................	410
DTC P0500 VEHICLE SPEED SENSOR (VSS) .........	412
Component Description ...........................................	412
ECM Terminals and Reference Value .....................	412
On Board Diagnosis Logic.......................................	412
Possible Cause........................................................	413
DTC Confirmation Procedure ..................................	413
Overall Function Check ...........................................	414
Wiring Diagram ........................................................	415
Diagnostic Procedure ..............................................	416
DTC P0505 IDLE AIR CONTROL VALVE (IACV) -
AUXILIARY AIR CONTROL (AAC) VALVE ...............	417
Description ...............................................................	417
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	418
ECM Terminals and Reference Value .....................	418
On Board Diagnosis Logic.......................................	418
Possible Cause........................................................	418
DTC Confirmation Procedure ..................................	418
Wiring Diagram ........................................................	420
Diagnostic Procedure ..............................................	421
DTC P0510 CLOSED THROTTLE POSITION
SWITCH .......................................................................	426
Component Description ...........................................	426
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	426
ECM Terminals and Reference Value .....................	426
On Board Diagnosis Logic.......................................	426
Possible Cause........................................................	426
DTC Confirmation Procedure ..................................	427
Overall Function Check ...........................................	427
Wiring Diagram ........................................................	429
Diagnostic Procedure ..............................................	430
DTC P0600 A/T COMMUNICATION LINE..................	434
System Description..................................................	434
ECM Terminals and Reference Value .....................	434
On Board Diagnosis Logic.......................................	434
Possible Cause........................................................	434
DTC Confirmation Procedure ..................................	434
Wiring Diagram ........................................................	436
Diagnostic Procedure ..............................................	437
DTC P0605 ECM .........................................................	438
Component Description ...........................................	438
On Board Diagnosis Logic.......................................	438

Possible Cause........................................................	438	MA
DTC Confirmation Procedure ..................................	438	MA
Diagnostic Procedure ..............................................	439
DTC P1110 (RIGHT, -B1), P1135 (LEFT, -B2)		EM
INTAKE VALVE TIMING CONTROL ..........................	440	EM
Description ...............................................................	440
CONSULT-II Reference Value in Data Monitor		LC
Mode ........................................................................	440	LC
ECM Terminals and Reference Value .....................	441
On Board Diagnosis Logic.......................................	442
Possible Cause........................................................	442
DTC Confirmation Procedure ..................................	443	FE
DTC P1111 (RIGHT, -B1), P1136 (LEFT, -B2)		FE
INTAKE VALVE TIMING CONTROL SOLENOID
VALVE (CIRCUIT)........................................................	445	CL
Component Description ...........................................	445
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	445	MT
ECM Terminals and Reference Value .....................	445
On Board Diagnosis Logic.......................................	446	AT
Possible Cause........................................................	446	AT
DTC Confirmation Procedure ..................................	446
Wiring Diagram ........................................................	447	TF
Diagnostic Procedure ..............................................	449	TF
DTC P1130 SWIRL CONTROL VALVE CONTROL
SOLENOID VALVE......................................................	452	PD
Description ...............................................................	452
CONSULT-II Reference Value in Data Monitor		AX
Mode ........................................................................	453	AX
ECM Terminals and Reference Value .....................	453
On Board Diagnosis Logic.......................................	453	SU
Possible Cause........................................................	454	SU
DTC Confirmation Procedure ..................................	454
Wiring Diagram ........................................................	456	BR
Diagnostic Procedure ..............................................	457
DTC P1140 (RIGHT, -B1), P1145 (LEFT, -B2)
INTAKE VALVE TIMING CONTROL POSITION		ST
SENSOR (CIRCUIT) ....................................................	475
Component Description ...........................................	475	RS
CONSULT-II Reference Value in Data Monitor		RS
Mode ........................................................................	475
ECM Terminals and Reference Value .....................	476	BT
On Board Diagnosis Logic.......................................	476	BT
Possible Cause........................................................	477
DTC Confirmation Procedure ..................................	477	HA
Wiring Diagram ........................................................	478
Diagnostic Procedure ..............................................	480	SC
DTC P1148 (RIGHT BANK, -B1), P1168 (LEFT		SC
BANK, -B2) CLOSED LOOP CONTROL ...................	484
On Board Diagnosis Logic.......................................	484	EL
Possible Cause........................................................	484	EL
DTC Confirmation Procedure ..................................	484

IDX

EC-5

CONTENTS (Cont'd)

Overall Function Check ...........................................	485
Diagnostic Procedure ..............................................	485
DTC P1165 SWIRL CONTROL VALVE CONTROL
VACUUM CHECK SWITCH.........................................	486
Component Description ...........................................	486
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	486
ECM Terminals and Reference Value .....................	486
On Board Diagnosis Logic.......................................	487
Possible Cause........................................................	487
DTC Confirmation Procedure ..................................	487
Wiring Diagram ........................................................	488
Diagnostic Procedure ..............................................	489
DTC P1320 IGNITION SIGNAL...................................	492
Component Description ...........................................	492
ECM Terminals and Reference Value .....................	492
On Board Diagnosis Logic.......................................	492
Possible Cause........................................................	493
DTC Confirmation Procedure ..................................	493
Wiring Diagram ........................................................	494
Diagnostic Procedure ..............................................	497
DTC P1335 CRANKSHAFT POSITION SENSOR
(CKPS) (REF) ..............................................................	503
Component Description ...........................................	503
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	503
ECM Terminals and Reference Value .....................	503
On Board Diagnosis Logic.......................................	504
Possible Cause........................................................	504
DTC Confirmation Procedure ..................................	504
Wiring Diagram ........................................................	506
Diagnostic Procedure ..............................................	507
DTC P1336 CRANKSHAFT POSITION SENSOR
(CKPS) (POS) (COG) ..................................................	510
Component Description ...........................................	510
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	510
ECM Terminals and Reference Value .....................	511
On Board Diagnosis Logic.......................................	511
Possible Cause........................................................	511
DTC Confirmation Procedure ..................................	512
Wiring Diagram ........................................................	513
Diagnostic Procedure ..............................................	514
DTC P1441 EVAP CONTROL SYSTEM (VERY
SMALL LEAK) .............................................................	519
On Board Diagnosis Logic.......................................	519
Possible Cause........................................................	519
DTC Confirmation Procedure ..................................	520
Diagnostic Procedure ..............................................	522
DTC P1444 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE...................................	534
Description ...............................................................	534

CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	534
ECM Terminals and Reference Value .....................	535
On Board Diagnosis Logic.......................................	535
Possible Cause........................................................	535
DTC Confirmation Procedure ..................................	536
Wiring Diagram ........................................................	537
Diagnostic Procedure ..............................................	538
DTC P1446 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (CLOSE).........	546
Component Description ...........................................	546
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	546
ECM Terminals and Reference Value .....................	546
On Board Diagnosis Logic.......................................	546
Possible Cause........................................................	547
DTC Confirmation Procedure ..................................	547
Wiring Diagram ........................................................	548
Diagnostic Procedure ..............................................	549
DTC P1447 EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM PURGE FLOW
MONITORING ..............................................................	554
System Description..................................................	554
On Board Diagnosis Logic.......................................	554
Possible Cause........................................................	554
DTC Confirmation Procedure ..................................	555
Overall Function Check ...........................................	556
Diagnostic Procedure ..............................................	557
DTC P1448 EVAPORATIVE EMISSION (EVAP)
CANISTER VENT CONTROL VALVE (OPEN)...........	565
Component Description ...........................................	565
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	565
ECM Terminals and Reference Value .....................	565
On Board Diagnosis Logic.......................................	565
Possible Cause........................................................	566
DTC Confirmation Procedure ..................................	566
Overall Function Check ...........................................	567
Wiring Diagram ........................................................	568
Diagnostic Procedure ..............................................	569
DTC P1464 FUEL LEVEL SENSOR CIRCUIT
(GROUND SIGNAL) ....................................................	574
Component Description ...........................................	574
On Board Diagnostic Logic......................................	574
Possible Cause........................................................	574
DTC Confirmation Procedure ..................................	574
Wiring Diagram ........................................................	575
Diagnostic Procedure ..............................................	576
DTC P1490 VACUUM CUT VALVE BYPASS
VALVE (CIRCUIT)........................................................	577
Description ...............................................................	577

EC-6

CONTENTS (Cont'd)

CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	577
ECM Terminals and Reference Value .....................	577
On Board Diagnosis Logic.......................................	578
Possible Cause........................................................	578
DTC Confirmation Procedure ..................................	578
Wiring Diagram ........................................................	579
Diagnostic Procedure ..............................................	580
DTC P1491 VACUUM CUT VALVE BYPASS
VALVE..........................................................................	583
Description ...............................................................	583
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	583
ECM Terminals and Reference Value .....................	583
On Board Diagnosis Logic.......................................	584
Possible Cause........................................................	584
DTC Confirmation Procedure ..................................	584
Overall Function Check ...........................................	585
Wiring Diagram ........................................................	586
Diagnostic Procedure ..............................................	587
DTC P1605 A/T DIAGNOSIS COMMUNICATION
LINE .............................................................................	595
Component Description ...........................................	595
On Board Diagnosis Logic.......................................	595
Possible Cause........................................................	595
DTC Confirmation Procedure ..................................	595
DTC P1706 PARK/NEUTRAL POSITION (PNP)
SWITCH .......................................................................	596
Component Description ...........................................	596
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	596
ECM Terminals and Reference Value .....................	596
On Board Diagnosis Logic.......................................	596
Possible Cause........................................................	596
DTC Confirmation Procedure ..................................	597
Overall Function Check ...........................................	598
Wiring Diagram ........................................................	599
Diagnostic Procedure ..............................................	600
VARIABLE INDUCTION AIR CONTROL SYSTEM
(VIAS)...........................................................................	603
Description ...............................................................	603
ECM Terminals and Reference Value .....................	604
Wiring Diagram ........................................................	605
Diagnostic Procedure ..............................................	606
INJECTOR ...................................................................	609
Component Description ...........................................	609
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	609
ECM Terminals and Reference Value .....................	609
Wiring Diagram ........................................................	610

Diagnostic Procedure ..............................................	611
START SIGNAL...........................................................	614
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	614
ECM Terminals and Reference Value .....................	614
Wiring Diagram ........................................................	615
Diagnostic Procedure ..............................................	616
FUEL PUMP.................................................................	618
System Description..................................................	618
Component Description ...........................................	618
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	618
ECM Terminals and Reference Value .....................	619
Wiring Diagram ........................................................	620
Diagnostic Procedure ..............................................	621
POWER STEERING OIL PRESSURE SWITCH.........	627
Component Description ...........................................	627
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	627
ECM Terminals and Reference Value .....................	627
Wiring Diagram ........................................................	628
Diagnostic Procedure ..............................................	629
REFRIGERANT PRESSURE SENSOR ......................	632
Description ...............................................................	632
ECM Terminals and Reference Value .....................	632
Wiring Diagram ........................................................	633
Diagnostic Procedure ..............................................	634
ELECTRICAL LOAD SIGNAL.....................................	636
ECM Terminals and Reference Value .....................	636
Wiring Diagram ........................................................	637
Diagnostic Procedure ..............................................	639
MIL & DATA LINK CONNECTORS ............................	642
Wiring Diagram ........................................................	642
SERVICE DATA AND SPECIFICATIONS (SDS) .......	643
Fuel Pressure Regulator..........................................	643
Idle Speed and Ignition Timing................................	643
Mass Air Flow Sensor..............................................	643
Engine Coolant Temperature Sensor ......................	643
Heated Oxygen Sensor 1 Heater (front) .................	643
Fuel Pump ...............................................................	643
IACV-AAC Valve ......................................................	643
Injector .....................................................................	643
Resistor....................................................................	643
Throttle Position Sensor ..........................................	644
Calculated Load Value.............................................	644
Intake Air Temperature Sensor................................	644
Heated Oxygen Sensor 2 Heater (rear) ..................	644
Crankshaft Position Sensor (REF) ..........................	644
Fuel Tank Temperature Sensor ...............................	644
Camshaft Position Sensor (PHASE) .......................	644

IDX

EC-7

TROUBLE DIAGNOSIS Ð INDEX

Alphabetical & P No. Index for DTC

NAEC0001

ALPHABETICAL INDEX FOR DTC

NAEC0001S01

Items	DTC*1	Reference page
(CONSULT-II screen terms)	DTC*1	Reference page
(CONSULT-II screen terms)

Unable to access ECM	Ð	EC-117

ABSL PRES SEN/CIRC	P0105	EC-158

AIR TEMP SEN/CIRC	P0110	EC-160

A/T 1ST GR FNCTN	P0731	AT-120

A/T 2ND GR FNCTN	P0732	AT-126

A/T 3RD GR FNCTN	P0733	AT-132

A/T 4TH GR FNCTN	P0734	AT-138

A/T COMM LINE	P0600*2	EC-434

A/T DIAG COMM LINE	P1605	EC-595

A/T TCC S/V FNCTN	P0744	AT-153

ATF TEMP SEN/CIRC	P0710	AT-105

CAM PS/CIRC (PHS)	P0340	EC-337

CLOSED LOOP-B1	P1148	EC-484

CLOSED LOOP-B2	P1168	EC-484

CLOSED TP SW/CIRC	P0510	EC-426

COOLANT T SEN/CIRC*3	P0115	EC-165

*COOLANT T SEN/CIRC	P0125	EC-182

CPS/CIRC (POS) COG	P1336	EC-510

CPS/CIRCUIT (POS)	P0335	EC-329

CPS/CIRCUIT (REF)	P1335	EC-503

CYL 1 MISFIRE	P0301	EC-315

CYL 2 MISFIRE	P0302	EC-315

CYL 3 MISFIRE	P0303	EC-315

CYL 4 MISFIRE	P0304	EC-315

CYL 5 MISFIRE	P0305	EC-315

CYL 6 MISFIRE	P0306	EC-315

ECM	P0605	EC-438

ENGINE SPEED SIG	P0725	AT-116

ENG OVER TEMP	P0217	EC-309

ENG OVER TEMP	P1217	LC-25

EVAP GROSS LEAK	P0455	EC-389

EVAP PURG FLOW/MON	P1447	EC-554

EVAP SYS PRES SEN	P0450	EC-376

EVAP SMALL LEAK	P0440	EC-347

EVAP VERY SMALL LEAK	P1441	EC-519

EC-8

TROUBLE DIAGNOSIS Ð INDEX

Alphabetical & P No. Index for DTC (Cont'd)

Items	DTC*1	Reference page
(CONSULT-II screen terms)	DTC*1	Reference page
(CONSULT-II screen terms)

FUEL LEVL SEN/CIRC	P0464	EC-408

FUEL LEVL SEN/CIRC	P1464	EC-574

FUEL LEVEL SENSOR	P0461	EC-406

FUEL LV SE (SLOSH)	P0460	EC-402

FUEL SYS-LEAN/BK1	P0171	EC-289

FUEL SYS-LEAN/BK2	P0174	EC-289

FUEL SYS-RICH/BK1	P0172	EC-297

FUEL SYS-RICH/BK2	P0175	EC-297

FUEL TEMP SEN/CIRC	P0180	EC-304

HO2S1 HTR (B1)	P0135	EC-235

HO2S1 HTR (B2)	P0155	EC-235

HO2S1 (B1)	P0130	EC-187

HO2S1 (B1)	P0131	EC-197

HO2S1 (B1)	P0132	EC-205

HO2S1 (B1)	P0133	EC-213

HO2S1 (B1)	P0134	EC-226

HO2S1 (B2)	P0150	EC-187

HO2S1 (B2)	P0151	EC-197

HO2S1 (B2)	P0152	EC-205

HO2S1 (B2)	P0153	EC-213

HO2S1 (B2)	P0154	EC-226

HO2S2 (B1)	P0137	EC-242

HO2S2 (B1)	P0138	EC-252

HO2S2 (B1)	P0139	EC-262

HO2S2 (B1)	P0140	EC-272

HO2S2 (B2)	P0157	EC-242

HO2S2 (B2)	P0158	EC-252

HO2S2 (B2)	P0159	EC-262

HO2S2 (B2)	P0160	EC-272

HO2S2 HTR (B1)	P0141	EC-281

HO2S2 HTR (B2)	P0161	EC-281

IACV/AAC VLV/CIRC	P0505	EC-417

IGN SIGNAL-PRIMARY	P1320	EC-492

INTK TIM S/CIRC-B1	P1140	EC-475

INTK TIM S/CIRC-B2	P1145	EC-475

INT/V TIM CONT-B1	P1110	EC-440

INT/V TIM CONT-B2	P1135	EC-440

IDX

EC-9

TROUBLE DIAGNOSIS Ð INDEX

Alphabetical & P No. Index for DTC (Cont'd)

Items	DTC*1	Reference page
(CONSULT-II screen terms)	DTC*1	Reference page
(CONSULT-II screen terms)

INT/V TIM V/CIR-B1	P1111	EC-445

INT/V TIM V/CIR-B2	P1136	EC-445

KNOCK SEN/CIRC-B1	P0325*2	EC-323

L/PRES SOL/CIRC	P0745	AT-162

MAF SEN/CIRCUIT*3	P0100	EC-150

MULTI CYL MISFIRE	P0300	EC-315

NATS MALFUNCTION	P1610 - P1615*2	EL-328

NO DTC IS DETECTED.
FURTHER TESTING	P0000	Ð
MAY BE REQUIRED.

O/R CLTCH SOL/CIRC	P1760	AT-185

P-N POS SW/CIRCUIT	P1706	EC-596

PNP SW/CIRC	P0705	AT-99

PURG VOLUME CONT/V	P0443	EC-362

PURG VOLUME CONT/V	P1444	EC-534

SFT SOL A/CIRC*3	P0750	AT-168

SFT SOL B/CIRC*3	P0755	AT-172

SWIRL CONT SOL/V	P1130	EC-452

SWL CON VC SW/CIRC	P1165	EC-486

TCC SOLENOID/CIRC	P0740	AT-148

TP SEN/CIRC A/T*3	P1705	AT-176

TRTL POS SEN/CIRC*3	P0120	EC-170

TW CATALYST SYS-B1	P0420	EC-342

TW CATALYST SYS-B2	P0430	EC-342

VC CUT/V BYPASS/V	P1491	EC-583

VC/V BYPASS/V	P1490	EC-577

VEH SPEED SEN/CIRC*4	P0500	EC-412

VEH SPD SEN/CIR A/T*4	P0720	AT-111

VENT CONTROL VALVE	P0446	EC-369

VENT CONTROL VALVE	P1446	EC-546

VENT CONTROL VALVE	P1448	EC-565

*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 ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at the same time.

NOTE:

IRegarding R50 models, ª-B1º and ªBK1º indicate right bank and ª-B2º and ªBK2º indicate left bank.

IBank 1 (-B1 or BK1) includes No. 1 cylinder.

EC-10

	TROUBLE DIAGNOSIS Ð INDEX
		Alphabetical & P No. Index for DTC (Cont'd)

P NO. INDEX FOR DTC			=NAEC0001S02
			=NAEC0001S02

DTC*1	Items		Reference page
DTC*1	(CONSULT-II screen terms)		Reference page
	(CONSULT-II screen terms)

Ð	Unable to access ECM		EC-117

	NO DTC IS DETECTED.
P0000	FURTHER TESTING		Ð
	MAY BE REQUIRED.

P0100	MAF SEN/CIRCUIT*3		EC-150

P0105	ABSL PRES SEN/CIRC		EC-158

P0110	AIR TEMP SEN/CIRC		EC-160

P0115	COOLANT T SEN/CIRC*3		EC-165

P0120	THRTL POS SEN/CIRC*3		EC-170

P0125	*COOLANT T SEN/CIRC		EC-182

P0130	HO2S1 (B1)		EC-187

P0131	HO2S1 (B1)		EC-197

P0132	HO2S1 (B1)		EC-205

P0133	HO2S1 (B1)		EC-213

P0134	HO2S1 (B1)		EC-226

P0135	HO2S1 HTR (B1)		EC-235

P0137	HO2S2 (B1)		EC-242

P0138	HO2S2 (B1)		EC-252

P0139	HO2S2 (B1)		EC-262

P0140	HO2S2 (B1)		EC-272

P0141	HO2S2 HTR (B1)		EC-281

P0150	HO2S1 (B2)		EC-187

P0151	HO2S1 (B2)		EC-197

P0152	HO2S1 (B2)		EC-205

P0153	HO2S1 (B2)		EC-213

P0154	HO2S1 (B2)		EC-226

P0155	HO2S1 HTR (B2)		EC-235

P0157	HO2S2 (B2)		EC-242

P0158	HO2S2 (B2)		EC-252

P0159	HO2S2 (B2)		EC-262

P0160	HO2S2 (B2)		EC-272

P0161	HO2S2 HTR (B2)		EC-281

P0171	FUEL SYS-LEAN/BK1		EC-289

P0172	FUEL SYS-RICH/BK1		EC-297

P0174	FUEL SYS-LEAN/BK2		EC-289

P0175	FUEL SYS-RICH/BK2		EC-297

P0180	FUEL TEMP SEN/CIRC		EC-304

IDX

EC-11

TROUBLE DIAGNOSIS Ð INDEX

Alphabetical & P No. Index for DTC (Cont'd)

DTC*1	Items	Reference page
DTC*1	(CONSULT-II screen terms)	Reference page
	(CONSULT-II screen terms)

P0217	ENG OVER TEMP	EC-309

P0300	MULTI CYL MISFIRE	EC-315

P0301	CYL 1 MISFIRE	EC-315

P0302	CYL 2 MISFIRE	EC-315

P0303	CYL 3 MISFIRE	EC-315

P0304	CYL 4 MISFIRE	EC-315

P0305	CYL 5 MISFIRE	EC-315

P0306	CYL 6 MISFIRE	EC-315

P0325*2	KNOCK SEN/CIRC-B1	EC-323

P0335	CPS/CIRCUIT (POS)	EC-329

P0340	CAM PS/CIRC (PHS)	EC-337

P0420	TW CATALYST SYS-B1	EC-342

P0430	TW CATALYST SYS-B2	EC-342

P0440	EVAP SMALL LEAK	EC-347

P0443	PURG VOLUME CONT/V	EC-362

P0446	VENT CONTROL VALVE	EC-369

P0450	EVAP SYS PRES SEN	EC-376

P0455	EVAP GROSS LEAK	EC-389

P0460	FUEL LV SE (SLOSH)	EC-402

P0461	FUEL LEVEL SENSOR	EC-406

P0464	FUEL LEVL SEN/CIRC	EC-408

P0500	VEH SPEED SEN/CIRC*4	EC-412

P0505	IACV/AAC VLV/CIRC	EC-417

P0510	CLOSED TP SW/CIRC	EC-426

P0600*2	A/T COMM LINE	EC-434

P0605	ECM	EC-438

P0705	PNP SW/CIRC	AT-99

P0710	ATF TEMP SEN/CIRC	AT-105

P0720	VEH SPD SEN/CIR A/T*4	AT-111

P0725	ENGINE SPEED SIG	AT-116

P0731	A/T 1ST GR FNCTN	AT-120

P0732	A/T 2ND GR FNCTN	AT-126

P0733	A/T 3RD GR FNCTN	AT-132

P0734	A/T 4TH GR FNCTN	AT-138

P0740	TCC SOLENOID/CIRC	AT-148

P0744	A/T TCC S/V FNCTN	AT-153

P0745	L/PRESS SOL/CIRC	AT-162

EC-12

TROUBLE DIAGNOSIS Ð INDEX

		Alphabetical & P No. Index for DTC (Cont'd)

DTC*1	Items		Reference page
DTC*1	(CONSULT-II screen terms)		Reference page
	(CONSULT-II screen terms)

P0750	SFT SOL A/CIRC*3		AT-168

P0755	SFT SOL B/CIRC*3		AT-172

P1110	INT/V TIM CONT-B1		EC-440

P1111	INT/V TIM V/CIR-B1		EC-445

P1130	SWIRL CONT SOL/V		EC-452

P1135	INT/V TIM CONT-B2		EC-440

P1136	INT/V TIM V/CIR-B2		EC-445

P1140	INTK TIM S/CIRC-B1		EC-475

P1145	INTK TIM S/CIRC-B2		EC-475

P1148	CLOSED LOOP-B1		EC-484

P1165	SWL CON VC SW/CIRC		EC-486

P1168	CLOSED LOOP-B2		EC-484

P1217	ENG OVER TEMP		LC-25

P1320	IGN SIGNAL-PRIMARY		EC-492

P1335	CPS/CIRCUIT (REF)		EC-503

P1336	CPS/CIRC (POS) COG		EC-510

P1441	EVAP VERY SMALL LEAK		EC-519

P1444	PURG VOLUME CONT/V		EC-534

P1446	VENT CONTROL VALVE		EC-546

P1447	EVAP PURG FLOW/MON		EC-554

P1448	VENT CONTROL VALVE		EC-565

P1464	FUEL LEVEL SEN/CIRC		EC-574

P1490	VC/V BYPASS/V		EC-577

P1491	VC CUT/V BYPASS/V		EC-583

P1605	A/T DIAG COMM LINE		EC-595

P1610 - P1615*2	NATS MALFUNCTION		EL-328

P1705	TP SEN/CIRC A/T*3		AT-176

P1706	P-N POS SW/CIRCUIT		EC-596

P1760	O/R CLTCH SOL/CIRC		AT-185

*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 ªRevolution sensor signalº and the ªVehicle speed sensor signalº meet the fail-safe condition at the same time.

NOTE:

IRegarding R50 models, ª-B1º and ªBK1º indicate right bank and ª-B2º and ªBK2º indicate left bank.

IBank 1 (-B1 or BK1) includes No. 1 cylinder.

IDX

EC-13

PRECAUTIONS

Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº

Supplemental Restraint System (SRS) ªAIR

BAGº and ªSEAT BELT PRE-TENSIONERº

NAEC0002

The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº 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 NISSAN MODEL R50 is as follows:

IFor 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.

IFor 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:

ITo 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 NISSAN dealer.

IImproper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, refer to RS section.

IDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified with yellow harness connector (and with yellow harness protector or yellow insulation tape before the harness connectors).

Precautions for On Board Diagnostic (OBD)

System of Engine and A/T

NAEC0003

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:

IBe 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.

IBe 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.)

ICertain systems and components, especially those related to OBD, may use a new style slidelocking type harness connector. For description and how to disconnect, refer to EL-9, ªHARNESS CONNECTOR (SLIDE-LOCKING TYPE)º.

IBe 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.

IBe 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 fuel injection system, etc.

IBe sure to erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer.

EC-14

PRECAUTIONS

Engine Fuel & Emission Control System

NAEC0004

SEF952RE

EC-15

IDX

PRECAUTIONS

Precautions

NAEC0005

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.

SEF289H

IWhen connecting ECM harness connector, fasten it securely with a lever as far as it will go as shown at left.

SEF908W

IWhen 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 terminal, when connecting pin connectors.

SEF291H

IBefore replacing ECM, perform ªECM Terminals and Reference Valueº inspection and make sure ECM functions properly. Refer to EC-127.

MEF040D

IAfter performing each TROUBLE DIAGNOSIS, perform ªDTC Confirmation Procedureº or ªOverall Function Checkº.

The DTC should not be displayed in the ªDTC Confirmation Procedureº if the repair is completed. The ªOverall Function Checkº should be a good result if the repair is completed.

SEF217U

EC-16

PRECAUTIONS

Precautions (Cont'd)

IWhen 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.

IDo 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 the ECM terminals, such as the ground.

SEF348N

IRegarding model R50, ª-B1º indicates the right bank and ª-B2º indicates the left bank as shown in the figure.

IBank 1 includes No. 1 cylinder.

SEF099WB

Wiring Diagrams and Trouble Diagnosis

NAEC0006

When you read Wiring diagrams, refer to the following:

IGI-11, ªHOW TO READ WIRING DIAGRAMSº

IEL-12, ªPOWER SUPPLY ROUTINGº for power distribution circuit

When you perform trouble diagnosis, refer to the following:

IGI-35, ªHOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSESº

IGI-24, ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENTº

EC-17

IDX

PREPARATION

Special Service Tools

NAEC0007

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)	Description
Tool name

KV10117100	Loosening or tightening front and rear heated oxy-
(J36471-A)	gen sensors with 22 mm (0.87 in) hexagon nut
Front heated oxygen
sensor wrench
Rear heated oxygen
sensor wrench
	NT379

(J44321)	Checking fuel pressure with pressure gauge
Fuel pressure adapter
and gauge kit

SEF326Z

		Commercial Service Tools
		NAEC0008
	Tool name	Description
	(Kent-Moore No.)	Description
	(Kent-Moore No.)

	Leak detector	Locating the EVAP leak
	(J41416)

	NT703
EVAP service port	Applying positive pressure through EVAP service
adapter	port
(J41413-OBD)

	NT704
Fuel filler cap adapter	Checking fuel tank vacuum relief valve opening
	pressure

NT653

EC-18

		PREPARATION
		Commercial Service Tools (Cont'd)


	Tool name	Description
	(Kent-Moore No.)	Description
	(Kent-Moore No.)

	Socket wrench	Removing and installing engine coolant tempera-
		ture sensor

	NT705
Oxygen sensor thread	Reconditioning the exhaust system threads before
cleaner	installing a new oxygen sensor. Use with anti-
(J-43897-18)	seize lubricant shown below.
(J-43897-12)	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
	NT828

Anti-seize lubricant (Per-	Lubricating oxygen sensor thread cleaning tool
matexTM 133AR or	when reconditioning exhaust system threads.
equivalent meeting MIL
specification MIL-A-907)

NT779

EC-19

IDX

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location

NAEC0009

SEF952Z

EC-20

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont'd)

SEF034Z

IDX

EC-21

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont'd)

SEF584Z

EC-22

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location (Cont'd)

SEF036Z

IDX

EC-23

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Circuit Diagram

NAEC0010

MODELS WITH SMART C/U Ð PREVIOUS

NAEC0010S01

MEC316D

EC-24

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Circuit Diagram (Cont'd)

MODELS WITH SMART C/U Ð NEW

NAEC0010S02

MEC391D

IDX

EC-25

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

System Diagram

NAEC0011

SEC306C

EC-26

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

	Vacuum Hose Drawing
Vacuum Hose Drawing		GI
	NAEC0012

Refer to ªSystem Diagramº, EC-26 for Vacuum Control System.

IDX

SEF953Z

EC-27

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

System Chart

NAEC0013

Input (Sensor)	ECM Function	Output (Actuator)

I Camshaft position sensor (PHASE)	Fuel injection & mixture ratio control	Injectors
I Crankshaft position sensor (REF)
I Crankshaft position sensor (REF)	Electronic ignition system	Power transistor
I Mass air flow sensor	Electronic ignition system	Power transistor
I Mass air flow sensor
I Engine coolant temperature sensor	Idle air control system	IACV-AAC valve
I Heated oxygen sensor 1 (front)	Idle air control system	IACV-AAC valve


I Ignition switch	Fuel pump control	Fuel pump relay
I Throttle position sensor
I Throttle position sensor	On board diagnostic system	MIL (On the instrument panel)
I Closed throttle position switch *3	On board diagnostic system	MIL (On the instrument panel)
I Park/neutral position (PNP) switch		Swirl control valve control solenoid
I Air conditioner switch	Swirl control valve control	Swirl control valve control solenoid
I Air conditioner switch	Swirl control valve control	valve
I Knock sensor		valve
I Knock sensor
I Intake air temperature sensor	Power valve control	VIAS control solenoid valve
I Absolute pressure sensor
I Absolute pressure sensor	Heated oxygen sensor 1 heater (front) con-	Heated oxygen sensor 1 heater
I EVAP control system pressure sensor *1	Heated oxygen sensor 1 heater (front) con-	Heated oxygen sensor 1 heater
I Battery voltage	trol	(front)
I Power steering oil pressure switch
I Power steering oil pressure switch		Heated oxygen sensor 2 heater
I Vehicle speed sensor	Heated oxygen sensor 2 heater (rear) control	Heated oxygen sensor 2 heater
I Fuel tank temperature sensor *1		(rear)
I Fuel tank temperature sensor *1
I Crankshaft position sensor (POS)	EVAP canister purge flow control	EVAP canister purge volume con-
I Heated oxygen sensor 2 (rear)*2	EVAP canister purge flow control	trol solenoid valve
I Heated oxygen sensor 2 (rear)*2		trol solenoid valve
I TCM (Transmission control module)
I TCM (Transmission control module)	Air conditioning cut control	Air conditioner relay
I Refrigerant pressure sensor	Air conditioning cut control	Air conditioner relay
I Electrical load
I Electrical load		I EVAP canister vent control valve
I Fuel level sensor*1	ON BOARD DIAGNOSIS for EVAP system	I EVAP canister vent control valve
I Fuel level sensor*1	ON BOARD DIAGNOSIS for EVAP system	I Vacuum cut valve bypass valve
		I Vacuum cut valve bypass valve

*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis. *2: This sensor is not used to control the engine system under normal conditions.

*3: 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

NAEC0014

Input/Output Signal Chart

NAEC0014S01

Sensor	Input Signal to ECM	ECM func-	Actuator
Sensor	Input Signal to ECM	tion	Actuator
		tion

Crankshaft position sensor (POS)	Engine speed (POS signal)

Crankshaft position sensor (REF)	Engine speed (REF signal)

Camshaft position sensor (PHASE)	Piston position

Mass air flow sensor	Amount of intake air

Engine coolant temperature sensor	Engine coolant temperature

Heated oxygen sensor 1 (front)	Density of oxygen in exhaust gas

Throttle position sensor	Throttle position
Throttle position sensor	Throttle valve idle position
	Throttle valve idle position	Fuel injec-
		Fuel injec-
Park/neutral position (PNP) switch	Gear position	tion & mix-	Injectors
		ture ratio	Injectors
Vehicle speed sensor	Vehicle speed	ture ratio
Vehicle speed sensor	Vehicle speed	control

Ignition switch	Start signal

Air conditioner switch	Air conditioner operation

Knock sensor	Engine knocking condition

Battery	Battery voltage

Absolute pressure sensor	Ambient air barometric pressure

Power steering oil pressure switch	Power steering operation

Heated oxygen sensor 2 (rear)*	Density of oxygen in exhaust gas

*: Under normal conditions, this sensor is not for engine control operation.

Basic Multiport Fuel Injection System

NAEC0014S02

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 crankshaft position sensor and the mass air flow sensor.

Various Fuel Injection Increase/Decrease Compensation

NAEC0014S03

In addition, the amount of fuel injected is compensated to improve engine performance under various operating conditions as listed below.

IDuring warm-up

IWhen starting the engine

IDuring acceleration

IHot-engine operation

IWhen selector lever is changed from ªNº to ªDº

IHigh-load, high-speed operation

IDuring deceleration

IDuring high engine speed operation

EC-29

IDX

ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION

Multiport Fuel Injection (MFI) System (Cont'd)

Mixture Ratio Feedback Control (Closed loop control)

NAEC0014S04

SEF336WA

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The warm-up three way catalyst can then better reduce CO, HC and NOx emissions. This system uses a heated oxygen sensor 1 (front) 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 heated oxygen sensor 1 (front) , refer to EC-187. 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.

Heated oxygen sensor 2 (rear) is located downstream of the warm-up three way catalyst. Even if the switching characteristics of the heated oxygen sensor 1 (front) shift, the air-fuel ratio is controlled to stoichiometric by the signal from the heated oxygen sensor 2 (rear).

Open Loop Control

NAEC0014S05

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.

IDeceleration and acceleration

IHigh-load, high-speed operation

IMalfunction of heated oxygen sensor 1 (front) or its circuit

IInsufficient activation of heated oxygen sensor 1 (front) at low engine coolant temperature

IHigh engine coolant temperature

IDuring warm-up

IAfter shifting from ªNº to ªDº

IWhen starting the engine

Mixture Ratio Self-learning Control

NAEC0014S06

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from the heated oxygen sensor 1 (front). 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 wire) 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 ªinjection pulse durationº to automatically compensate for the difference between the two ratios.

ªFuel trimº refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short term fuel trim and long term fuel trim.

ªShort term fuel trimº is the short-term fuel compensation used to maintain the mixture ratio at its theoretical value. The signal from the heated oxygen sensor 1 (front) 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.

ªLong term fuel trimº 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.

EC-30

+ 614 hidden pages

Nissan Pathfinder 2001 User Manual

Alphabetical & P No. Index for DTC

PRECAUTIONS

Engine Fuel & Emission Control System

PRECAUTIONS

Wiring Diagrams and Trouble Diagnosis

PREPARATION

Special Service Tools

Commercial Service Tools

ENGINE AND EMISSION CONTROL OVERALL SYSTEM

Engine Control Component Parts Location

Circuit Diagram

System Diagram

Vacuum Hose Drawing

System Chart

ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION

Multiport Fuel Injection (MFI) System