Nissan Primera User Manual

ENGINE CONTROL SYSTEM

SECTION EC

EC

CONTENTS

QG18DE
TROUBLE DIAGNOSIS Ð INDEX..................................	6
Alphabetical & P No. Index for DTC ...........................	6
PRECAUTIONS ...............................................................	9
Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''..............	9
Precautions for On Board Diagnostic (OBD)
System of Engine ........................................................	9
Engine Fuel & Emission Control System ..................	10
Precautions ................................................................	11
Wiring Diagrams and Trouble Diagnosis...................	12
PREPARATION .............................................................	13
Special Service Tools ................................................	13
Commercial Service Tool ..........................................	13
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................	14
Engine Control Component Parts Location...............	14
Circuit Diagram ..........................................................	17
System Diagram ........................................................	18
Vacuum Hose Drawing..............................................	19
System Chart .............................................................	20
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION ...............................................	21
Multiport Fuel Injection (MFI) System .......................	21
Electronic Ignition (EI) System ..................................	23
Air Conditioning Cut Control......................................	24
Fuel Cut Control (at no load & high engine
speed) ........................................................................	25
Evaporative Emission System ...................................	25
Positive Crankcase Ventilation ..................................	28
BASIC SERVICE PROCEDURE ...................................	29
Fuel Pressure Release ..............................................	29
Fuel Pressure Check .................................................	29
Fuel Pressure Regulator Check ................................	30
Injector .......................................................................	30
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment .................................................................	32
Idle Air Volume Learning ...........................................	43

ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION ...............................................................	45
Introduction ................................................................	45
Two Trip Detection Logic...........................................	45
Emission-related Diagnostic Information ...................	46
Malfunction Indicator (MI) ..........................................	54
OBD System Operation Chart ...................................	59
CONSULT-II...............................................................	64
Generic Scan Tool (GST)..........................................	74
TROUBLE DIAGNOSIS Ð INTRODUCTION ...............	76
Introduction ................................................................	76
Work Flow..................................................................	78
TROUBLE DIAGNOSIS Ð BASIC INSPECTION ........	80
Basic Inspection.........................................................	80
TROUBLE DIAGNOSIS Ð GENERAL
DESCRIPTION ...............................................................	90
DTC Inspection Priority Chart....................................	90
Fail-safe Chart ...........................................................	91
Symptom Matrix Chart...............................................	92
CONSULT-II Reference Value in Data Monitor
Mode ..........................................................................	96
Major Sensor Reference Graph in Data Monitor
Mode ..........................................................................	98
ECM Terminals and Reference Value.....................	101
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................	108
Description ...............................................................	108
Diagnostic Procedure ..............................................	108
TROUBLE DIAGNOSIS FOR POWER SUPPLY........	109
Main Power Supply and Ground Circuit..................	109
DTC P0100 MASS AIR FLOW SENSOR (MAFS)......	115
Component Description ...........................................	115
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	115
ECM Terminals and Reference Value.....................	115
On Board Diagnosis Logic.......................................	115
DTC Confirmation Procedure ..................................	116
Wiring Diagram ........................................................	117
Diagnostic Procedure ..............................................	118

CONTENTS (Cont'd)

Component Inspection.............................................	120
DTC P0110 INTAKE AIR TEMPERATURE
SENSOR ......................................................................	121
Component Description ...........................................	121
On Board Diagnosis Logic.......................................	121
DTC Confirmation Procedure ..................................	121
Wiring Diagram ........................................................	122
Diagnostic Procedure ..............................................	123
Component Inspection.............................................	124
DTC P0115 ENGINE COOLANT TEMPERATURE
SENSOR(ECTS) (CIRCUIT) ........................................	125
Component Description ...........................................	125
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	125
On Board Diagnosis Logic.......................................	125
DTC Confirmation Procedure ..................................	126
Wiring Diagram ........................................................	127
Diagnostic Procedure ..............................................	128
Component Inspection.............................................	129
DTC P0120 THROTTLE POSITION SENSOR ...........	130
Component Description ...........................................	130
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	130
ECM Terminals and Reference Value.....................	131
On Board Diagnosis Logic.......................................	131
DTC Confirmation Procedure ..................................	131
Wiring Diagram ........................................................	133
Diagnostic Procedure ..............................................	134
Component Inspection.............................................	136
DTC P0130 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (CIRCUIT)..........................................	138
Component Description ...........................................	138
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	138
ECM Terminals and Reference Value.....................	138
On Board Diagnosis Logic.......................................	139
DTC Confirmation Procedure ..................................	139
Overall Function Check ...........................................	140
Wiring Diagram ........................................................	141
Diagnostic Procedure ..............................................	142
Component Inspection.............................................	143
DTC P0131 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (LEAN SHIFT MONITORING) ..........	144
Component Description ...........................................	144
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	144
ECM Terminals and Reference Value.....................	144
On Board Diagnosis Logic.......................................	145
DTC Confirmation Procedure ..................................	145
Overall Function Check ...........................................	146
Diagnostic Procedure ..............................................	146
Component Inspection.............................................	148

DTC P0132 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (RICH SHIFT MONITORING) ...........	150
Component Description ...........................................	150
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	150
ECM Terminals and Reference Value.....................	150
On Board Diagnosis Logic.......................................	151
DTC Confirmation Procedure ..................................	151
Overall Function Check ...........................................	152
Diagnostic Procedure ..............................................	152
Component Inspection.............................................	154
DTC P0133 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (RESPONSE MONITORING)............	156
Component Description ...........................................	156
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	156
ECM Terminals and Reference Value.....................	156
On Board Diagnosis Logic.......................................	157
DTC Confirmation Procedure ..................................	157
Overall Function Check ...........................................	158
Wiring Diagram ........................................................	159
Diagnostic Procedure ..............................................	160
Component Inspection.............................................	163
DTC P0134 FRONT HEATED OXYGEN SENSOR
(FRONT HO2S) (HIGH VOLTAGE).............................	164
Component Description ...........................................	164
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	164
ECM Terminals and Reference Value.....................	164
On Board Diagnosis Logic.......................................	165
DTC Confirmation Procedure ..................................	165
Wiring Diagram ........................................................	166
Diagnostic Procedure ..............................................	167
Component Inspection.............................................	168
DTC P0135 FRONT HEATED OXYGEN SENSOR
HEATER.......................................................................	169
Description ...............................................................	169
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	169
ECM Terminals and Reference Value.....................	169
On Board Diagnosis Logic.......................................	169
DTC Confirmation Procedure ..................................	170
Wiring Diagram ........................................................	171
Diagnostic Procedure ..............................................	172
Component Inspection.............................................	173
DTC P0137 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (MIN. VOLTAGE MONITORING)........	174
Component Description ...........................................	174
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	174
ECM Terminals and Reference Value.....................	174
On Board Diagnosis Logic.......................................	174

EC-QG-2

CONTENTS (Cont'd)

DTC Confirmation Procedure ..................................	175
Overall Function Check ...........................................	176
Wiring Diagram ........................................................	177
Diagnostic Procedure ..............................................	178
Component Inspection.............................................	181
DTC P0138 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (MAX. VOLTAGE MONITORING) ......	182
Component Description ...........................................	182
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	182
ECM Terminals and Reference Value.....................	182
On Board Diagnosis Logic.......................................	182
DTC Confirmation Procedure ..................................	183
Overall Function Check ...........................................	184
Wiring Diagram ........................................................	185
Diagnostic Procedure ..............................................	186
Component Inspection.............................................	188
DTC P0139 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (RESPONSE MONITORING)..............	190
Component Description ...........................................	190
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	190
ECM Terminals and Reference Value.....................	190
On Board Diagnosis Logic.......................................	190
DTC Confirmation Procedure ..................................	191
Overall Function Check ...........................................	192
Wiring Diagram ........................................................	193
Diagnostic Procedure ..............................................	194
Component Inspection.............................................	197
DTC P0140 REAR HEATED OXYGEN SENSOR
(REAR HO2S) (HIGH VOLTAGE)...............................	198
Component Description ...........................................	198
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	198
ECM Terminals and Reference Value.....................	198
On Board Diagnosis Logic.......................................	198
DTC Confirmation Procedure ..................................	199
Overall Function Check ...........................................	199
Wiring Diagram ........................................................	200
Diagnostic Procedure ..............................................	201
Component Inspection.............................................	202
DTC P0141 REAR HEATED OXYGEN SENSOR
HEATER.......................................................................	204
Description ...............................................................	204
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	204
ECM Terminals and Reference Value.....................	204
On Board Diagnosis Logic.......................................	204
DTC Confirmation Procedure ..................................	205
Wiring Diagram ........................................................	206
Diagnostic Procedure ..............................................	207
Component Inspection.............................................	208

DTC P0171 FUEL INJECTION SYSTEM
FUNCTION (LEAN SIDE) ............................................	209
On Board Diagnosis Logic.......................................	209
DTC Confirmation Procedure ..................................	209
Wiring Diagram ........................................................	210
Diagnostic Procedure ..............................................	211
DTC P0172 FUEL INJECTION SYSTEM
FUNCTION (RICH SIDE) .............................................	215
On Board Diagnosis Logic.......................................	215
DTC Confirmation Procedure ..................................	215
Wiring Diagram ........................................................	216
Diagnostic Procedure ..............................................	217
DTC P0180 TANK FUEL TEMPERATURE
SENSOR ......................................................................	221
Component Description ...........................................	221
On Board Diagnosis Logic.......................................	221
DTC Confirmation Procedure ..................................	221
Wiring Diagram ........................................................	222
Diagnostic Procedure ..............................................	223
Component Inspection.............................................	224
DTC P0300 - P0304 NO. 4 - 1 CYLINDER
MISFIRE, MULTIPLE CYLINDER MISFIRE ...............	225
On Board Diagnosis Logic.......................................	225
DTC Confirmation Procedure ..................................	225
Diagnostic Procedure ..............................................	226
DTC P0325 KNOCK SENSOR (KS) ...........................	231
Component Description ...........................................	231
ECM Terminals and Reference Value.....................	231
On Board Diagnosis Logic.......................................	231
DTC Confirmation Procedure ..................................	231
Wiring Diagram ........................................................	232
Diagnostic Procedure ..............................................	233
Component Inspection.............................................	234
DTC P0335 CRANKSHAFT POSITION SENSOR
(POS)............................................................................	235
Component Description ...........................................	235
ECM Terminals and Reference Value.....................	235
On Board Diagnosis Logic.......................................	235
DTC Confirmation Procedure ..................................	236
Wiring Diagram ........................................................	237
Diagnostic Procedure ..............................................	238
Component Inspection.............................................	240
DTC P0340 CAMSHAFT POSITION SENSOR
(CMPS) (PHASE).........................................................	241
Component Description ...........................................	241
ECM Terminals and Reference Value.....................	241
On Board Diagnosis Logic.......................................	241
DTC Confirmation Procedure ..................................	242
Wiring Diagram ........................................................	243
Diagnostic Procedure ..............................................	244
Component Inspection.............................................	246

EC-QG-3

CONTENTS (Cont'd)

DTC P0400 EGR FUNCTION (CLOSE)......................	247
Description ...............................................................	247
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	248
ECM Terminals and Reference Value.....................	248
On Board Diagnosis Logic.......................................	248
DTC Confirmation Procedure ..................................	249
Wiring Diagram ........................................................	251
Diagnostic Procedure ..............................................	252
Component Inspection.............................................	254
DTC P0403 EGR VOLUME CONTROL VALVE
(CIRCUIT).....................................................................	255
Description ...............................................................	255
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	256
ECM Terminals and Reference Value.....................	256
On Board Diagnosis Logic.......................................	256
DTC Confirmation Procedure ..................................	256
Wiring Diagram ........................................................	257
Diagnostic Procedure ..............................................	258
Component Inspection.............................................	259
DTC P0420 THREE WAY CATALYST FUNCTION ...	260
On Board Diagnosis Logic.......................................	260
DTC Confirmation Procedure ..................................	260
Overall Function Check ...........................................	261
Diagnostic Procedure ..............................................	261
DTC P0443 EVAP CANISTER PURGE VOLUME
CONTROL SOLENOID VALVE (CIRCUIT) ................	264
Description ...............................................................	264
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	264
ECM Terminals and Reference Value.....................	265
On Board Diagnosis Logic.......................................	265
DTC Confirmation Procedure ..................................	265
Wiring Diagram ........................................................	266
Diagnostic Procedure ..............................................	267
Component Inspection.............................................	268
DTC P0500 VEHICLE SPEED SENSOR (VSS) .........	269
Component Description ...........................................	269
ECM Terminals and Reference Value.....................	269
On Board Diagnosis Logic.......................................	269
DTC Confirmation Procedure ..................................	269
Wiring Diagram ........................................................	271
Diagnostic Procedure ..............................................	272
DTC P0505 IDLE AIR CONTROL VALVE (IACV)
Ð AUXILIARY AIR CONTROL (AAC) VALVE ..........	273
Description ...............................................................	273
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	274
ECM Terminals and Reference Value.....................	274
On Board Diagnosis Logic.......................................	274
DTC Confirmation Procedure ..................................	274

Wiring Diagram ........................................................	275
Diagnostic Procedure ..............................................	276
Component Inspection.............................................	277
DTC P0510 CLOSED THROTTLE POSITION
SWITCH .......................................................................	278
Component Description ...........................................	278
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	278
ECM Terminals and Reference Value.....................	278
On Board Diagnosis Logic.......................................	278
DTC Confirmation Procedure ..................................	279
Overall Function Check ...........................................	279
Wiring Diagram ........................................................	280
Diagnostic Procedure ..............................................	281
Component Inspection.............................................	282
DTC P0605 ECM .........................................................	284
Component Description ...........................................	284
On Board Diagnosis Logic.......................................	284
DTC Confirmation Procedure ..................................	284
Diagnostic Procedure ..............................................	284
DTC P1111 INTAKE VALVE TIMING CONTROL
SOLENOID VALVE......................................................	285
Component Description ...........................................	285
Operation .................................................................	285
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	285
ECM Terminals and Reference Value.....................	285
On Board Diagnosis Logic.......................................	285
DTC Confirmation Procedure ..................................	286
Wiring Diagram ........................................................	287
Diagnostic Procedure ..............................................	288
Component Inspection.............................................	289
DTC P1131 SWIRL CONTROL VALVE CONTROL
SOLENOID VALVE......................................................	290
Description ...............................................................	290
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	290
ECM Terminals and Reference Value.....................	291
Component Description ...........................................	291
On Board Diagnosis Logic.......................................	291
DTC Confirmation Procedure ..................................	291
Wiring Diagram ........................................................	292
Diagnostic Procedure ..............................................	293
Component Inspection.............................................	294
DTC P1217 OVERHEAT (COOLING SYSTEM) .........	296
System Description..................................................	296
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	296
ECM Terminals and Reference Value.....................	297
On Board Diagnosis Logic.......................................	297
Overall Function Check ...........................................	298
Wiring Diagram ........................................................	299

EC-QG-4

CONTENTS (Cont'd)

Diagnostic Procedure ..............................................	301
Main 12 Causes of Overheating..............................	305
Component Inspection.............................................	306
DTC P1401 EGR TEMPERATURE SENSOR.............	307
Component Description ...........................................	307
On Board Diagnosis Logic.......................................	307
DTC Confirmation Procedure ..................................	307
Wiring Diagram ........................................................	309
Diagnostic Procedure ..............................................	310
Component Inspection.............................................	311
DTC P1402 EGR FUNCTION (OPEN) ........................	312
Description ...............................................................	312
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	313
ECM Terminals and Reference Value.....................	313
On Board Diagnosis Logic.......................................	313
DTC Confirmation Procedure ..................................	314
Wiring Diagram ........................................................	316
Diagnostic Procedure ..............................................	317
Component Inspection.............................................	318
DTC P1706 PARK/NEUTRAL POSITION (PNP)
SWITCH .......................................................................	320
Component Description ...........................................	320
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	320
ECM Terminals and Reference Value.....................	320
On Board Diagnosis Logic.......................................	320
DTC Confirmation Procedure ..................................	320
Overall Function Check ...........................................	321
Wiring Diagram ........................................................	322
Diagnostic Procedure For M/T Models....................	323
INJECTOR ...................................................................	325
Component Description ...........................................	325
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	325
ECM Terminals and Reference Value.....................	325
Wiring Diagram ........................................................	326
Diagnostic Procedure ..............................................	327
Component Inspection.............................................	329
IGNITION SIGNAL.......................................................	330
Component Description ...........................................	330
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	330
ECM Terminals and Reference Value.....................	330
Wiring Diagram ........................................................	331
Diagnostic Procedure ..............................................	333
Component Inspection.............................................	335
START SIGNAL...........................................................	336
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	336
ECM Terminals and Reference Value.....................	336
Wiring Diagram ........................................................	337

Diagnostic Procedure ..............................................	338
FUEL PUMP.................................................................	340
System Description..................................................	340
Component Description ...........................................	340
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	340
ECM Terminals and Reference Value.....................	340
Wiring Diagram ........................................................	341
Diagnostic Procedure ..............................................	342
Component Inspection.............................................	344
POWER STEERING OIL PRESSURE SWITCH.........	345
Component Description ...........................................	345
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	345
ECM Terminals and Reference Value.....................	345
Wiring Diagram ........................................................	346
Diagnostic Procedure ..............................................	347
Component Inspection.............................................	349
ELECTRICAL LOAD SIGNAL.....................................	350
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................	350
ECM Terminals and Reference Value.....................	350
Wiring Diagram ........................................................	351
MI & DATA LINK CONNECTORS ..............................	353
Wiring Diagram ........................................................	353
SERVICE DATA AND SPECIFICATIONS (SDS) .......	354
Fuel Pressure Regulator..........................................	354
Idle Speed and Ignition Timing................................	354
Mass Air Flow Sensor .............................................	354
Intake Air Temperature Sensor ...............................	354
Engine Coolant Temperature Sensor......................	354
Throttle Position Sensor ..........................................	354
Front Heated Oxygen Sensor Heater......................	354
Rear Heated Oxygen Sensor Heater ......................	354
Tank Fuel Temperature Sensor ..............................	355
Crankshaft Position Sensor (POS)..........................	355
Camshaft Position Sensor (PHASE) .......................	355
EGR Volume Control Valve.....................................	355
EGR Temperature Sensor.......................................	355
EVAP Canister Purge Volume Control Valve..........	355
IACV-AAC Valve......................................................	355
Injector .....................................................................	355
Ignition Coil with Power Transistor..........................	356
Fuel Pump ...............................................................	356

EC-QG-5

TROUBLE DIAGNOSIS Ð INDEX					QG18DE
Alphabetical & P No. Index for DTC
	Alphabetical & P No. Index for DTC
ALPHABETICAL INDEX FOR DTC					NCEC0001
					NCEC0001S01
Items		DTC*5
				Reference page
	CONSULT-II
(CONSULT-II screen terms)			ECM*1
	GST*2
Unable to access ECM	Ð		Ð	EC-QG-91
AIR TEMP SEN/CIRC*6	P0110		0110	EC-QG-121
CAM POS SEN/CIRC	P0340		0340	EC-QG-241
CLOSED TP SW/CIRC*6	P0510		0510	EC-QG-278
COOLANT T SEN/CIRC*3	P0115		0115	EC-QG-125
CPS/CIRCUIT (POS)*6	P0335		0335	EC-QG-235
CYL 1 MISFIRE*6	P0301		0301	EC-QG-225
CYL 2 MISFIRE*6	P0302		0302	EC-QG-225
CYL 3 MISFIRE*6	P0303		0303	EC-QG-225
CYL 4 MISFIRE*6	P0304		0304	EC-QG-225
ECM*6	P0605		0605	EC-QG-284
EGR SYSTEM*6	P0400		0400	EC-QG-247
EGR SYSTEM*6	P1402		1402	EC-QG-312
EGR TEMP SEN/CIRC*6	P1401		1401	EC-QG-307
EGR VOL CON/V CIR*6	P0403		0403	EC-QG-255
ENG OVER TEMP	P1217		P1217	EC-QG-296
FR O2 SE HEATER-B1*6	P0135		0135	EC-QG-169
FRONT O2 SENSOR-B1*6	P0130		0130	EC-QG-138
FRONT O2 SENSOR-B1*6	P0131		0131	EC-QG-144
FRONT O2 SENSOR-B1*6	P0132		0132	EC-QG-150
FRONT O2 SENSOR-B1*6	P0133		0133	EC-QG-156
FRONT O2 SENSOR-B1*6	P0134		0134	EC-QG-164
FUEL SYS-LEAN/BK1*6	P0171		0171	EC-QG-209
FUEL SYS-RIGH/BK1*6	P0172		0172	EC-QG-215
FUEL TEMP SEN/CIRC*6	P0180		0180	EC-QG-221
IACV/AAC VLV/CIRC*6	P0505		0505	EC-QG-273
INT/V TIM V/CIR-B1*6	P1111		1111	EC-QG-285
KNOCK SEN/CIRC-B1	P0325		0325	EC-QG-231
MAF SEN/CIRCUIT*3	P0100		0100	EC-QG-115
MULTI CYL MISFIRE*6	P0300		0300	EC-QG-225
NATS MALFUNCTION	P1610 - P1615		1610 - 1615	Refer to EL section.
NO SELF DIAGNOSTIC FAILURE INDICATED	P0000		0000	Ð
NO SELF DIAGNOSTIC FAILUTRE INDICATED	No DTC		Flashing*4	EC-QG-55
P-N POS SW/CIRCUIT*6	P1706		1706	EC-QG-320
PURG VOLUME CONT/V*6	P0443		0443	EC-QG-264

EC-QG-6

	TROUBLE DIAGNOSIS Ð INDEX					QG18DE
				Alphabetical & P No. Index for DTC (Cont'd)
	Items		DTC*5
					Reference page
		CONSULT-II
	(CONSULT-II screen terms)			ECM*1
		GST*2
REAR O2	SENSOR-B1*6	P0137		0137	EC-QG-174
REAR O2	SENSOR*6	P0138		0138	EC-QG-182
REAR O2	SENSOR*6	P0139		0139	EC-QG-190
REAR O2	SENSOR*6	P0140		0140	EC-QG-198
RR O2 SE HEATER-B1*6		P0141		0141	EC-QG-204
SWIRL CONT SOL/V*6		P1131		1131	EC-QG-290
THRTL POS SEN/CIRC*3		P0120		0120	EC-QG-130
TW CATALYST SYS-B1*6		P0420		0420	EC-QG-260
VEH SPEED SEN/CIRC		P0500		0500	EC-QG-241

*1: In Diagnostic Test Mode II (Self-diagnostic results). These numbers are controlled by NISSAN. *2: These numbers are prescribed by ISO15031-6.

*3: When the fail-safe operation occurs, the MI illuminates. *4: While engine is running.

*5: 1st trip DTC No. is the same as DTC No. *6: Not available for ``Eastern Europe model''.

P NO. INDEX FOR DTC

NCEC0001S02

	DTC*5			Items
					Reference page
CONSULT-II
		ECM*1		(CONSULT-II screen terms)
GST*2
Ð		Ð		Unable to access ECM	EC-QG-91
No DTC		Flashing*4		NO SELF DIAGNOSTIC FAILURE INDICATED	EC-QG-55
P0000		0000		NO SELF DIAGNOSTIC FAILURE INDICATED	Ð
P0100		0100		MAF SEN/CIRCUIT*3	EC-QG-115
P0110		0110		AIR TEMP SEN/CIRC*6	EC-QG-121
P0115		0115		COOLANT T SEN/CIRC*3	EC-QG-125
P0120		0120		THRTL POS SEN/CIRC*3	EC-QG-130
P0130		0130		FRONT O2 SENSOR-B1	EC-QG-138
P0131		0131		FRONT O2 SENSOR-B1*6	EC-QG-144
P0132		0132		FRONT O2 SENSOR-B1*6	EC-QG-150
P0133		0133		FRONT O2 SENSOR-B1*6	EC-QG-156
P0134		0134		FRONT O2 SENSOR-B1*6	EC-QG-164
P0135		0135		FR O2 SE HEATER-B1*6	EC-QG-169
P0137		0137		REAR O2 SENSOR-B1*6	EC-QG-174
P0138		0138		REAR O2 SENSOR-B1*6	EC-QG-182
P0139		0139		REAR O2 SENSOR-B1*6	EC-QG-190
P0140		0140		REAR O2 SENSOR-B1*6	EC-QG-198
P0141		0141		RR O2 SE HEATER-B1*6	EC-QG-204
P0171		0171		FUEL SYS-LEAN/BK1*6	EC-QG-209

EC-QG-7

		TROUBLE DIAGNOSIS Ð INDEX			QG18DE
Alphabetical & P No. Index for DTC (Cont'd)
	DTC*5		Items
				Reference page
CONSULT-II
		ECM*1	(CONSULT-II screen terms)
GST*2
P0172		0172	FUEL SYS-RICH/BK1*6	EC-QG-215
P0180		0180	FUEL TEMP SEN/CIRC*6	EC-QG-221
P0300		0300	MULTI CYL MISFIRE*6	EC-QG-225
P0301		0301	CYL 1 MISFIRE*6	EC-QG-225
P0302		0302	CYL 2 MISFIRE*6	EC-QG-225
P0303		0303	CYL 3 MISFIRE*6	EC-QG-225
P0304		0304	CYL 4 MISFIRE*6	EC-QG-225
P0325		0325	KNOCK SEN/CIRC-B1	EC-QG-231
P0335		0335	CPS/CIRCUIT (POS)*6	EC-QG-235
P0340		0340	CAM POS SEN/CIRC	EC-QG-241
P0400		0400	EGR SYSTEM*6	EC-QG-247
P0403		0403	EGR VOL CON/V CIR*6	EC-QG-255
P0420		0420	TW CATALYST SYS-B1*6	EC-QG-260
P0443		0443	PURG VOLUME CONT/V*6	EC-QG-264
P0500		0500	VEH SPEED SEN/CIRC	EC-QG-269
P0505		0505	IACV/AAC VLV/CIRC*6	EC-QG-273
P0510		0510	CLOSED TP SW/CIRC*6	EC-QG-278
P0605		0605	ECM	EC-QG-284
P1111		1111	INT/V TIM V/CIR-V1*6	EC-QG-285
P1131		1131	SWIRL CONT SOL/V*6	EC-QG-290
P1217		1217	ENG OVER TEMP	EC-QG-296
P1401		1401	EGR TEMP SEN/CIRC*6	EC-QG-307
P1402		1402	EGR SYSTEM*6	EC-QG-312
P1610 - 1615		1610 - 1615	NATS MALFUNCTION	Refer to EL section.
P1706		1706	P-N POS SW/CIRCUIT*6	EC-QG-320

*1: In Diagnostic Test Mode II (Self-diagnostic results). These numbers are controlled by NISSAN. *2: These numbers are prescribed by ISO15031-6.

*3: When the fail-safe operation occurs, the MI illuminates. *4: While engine is running.

*5: 1st trip DTC No. is the same as DTC No. *6: Not available for ``Eastern Europe model''.

EC-QG-8

PRECAUTIONS	QG18DE

Supplemental Restraint System (SRS) ``AIR BAG'' and ``SEAT BELT PRE-TENSIONER''

Supplemental Restraint System (SRS) ``AIR

BAG'' and ``SEAT BELT PRE-TENSIONER''

NCEC0002

The Supplemental Restraint System ``AIR BAG'' and ``SEAT BELT PRE-TENSIONER'', used along with a seat belt, help to reduce the risk or severity of injury to the driver and front passenger in a frontal collision. The Supplemental Restraint System consists of air bag modules (located in the center of the steering wheel and on the instrument panel on the passenger side), seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.

In addition to the supplemental air bag modules for a frontal collision, the supplemental side air bag used along with the seat belt helps to reduce the risk or severity of injury to the driver and front passenger in a side collision. The supplemental side air bag consists of air bag modules (located in the outer side of front seats), satellite sensor, diagnosis sensor unit (one of components of supplemental air bags for a frontal collision), wiring harness, warning lamp (one of components of supplemental air bags for a frontal collision). Information necessary to service the system safely is included in the RS section of this Service Manual.

WARNING:

+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 NISSAN dealer.

+Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system.

+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses (except ``SEAT BELT PRE-TENSIONER'' connector) 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

NCEC0003

The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver of a malfunction causing emission deterioration.

CAUTION:

+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 MI to light up.

+Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease, dirt, bent terminals, etc.)

+Certain 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 section, ``Description'', ``HARNESS CONNECTOR''.

+Be sure to route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MI to light up due to the short circuit.

+Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MI to light up due to the malfunction of the EGR system or fuel injection system, etc.

+Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM before returning the vehicle to the customer.

EC-QG-9

PRECAUTIONS	QG18DE

Engine Fuel & Emission Control System

Engine Fuel & Emission Control System

BATTERY

●Always use a 12 volt battery as power source.

●Do not attempt to disconnect battery cables while engine is running.

ECM

●Do not disassemble ECM.

●If a battery terminal is disconnected, the memory will return to the ECM value.

The ECM will now start to self-control at its initial value. Engine operation can vary slightly when the terminal is disconnected. However, this is not an indication of a problem. Do not replace parts because of a slight variation.

ENGINE CONTROL PARTS HANDLING

●Handle mass air flow sensor carefully to avoid damage.

●Do not disassemble mass air flow sensor.

●Do not clean mass air flow sensor with any type of detergent.

●Do not disassemble IAC valve-AAC valve.

●Even a slight leak in the air intake system can cause serious problems.

●Do not shock or jar the camshaft position sensor and crankshaft position sensor.

WHEN STARTING

●Do not depress accelerator pedal when starting.

●Immediately after starting, do not rev up engine unnecessarily.

●Do not rev up engine just prior to shutdown.

NCEC0004

WIRELESS EQUIPMENT

●When installing C.B. ham radio or a mobile phone, be sure to observe the following as it may adversely affect electronic control systems depending on installation location.

1)Keep the antenna as far as

possible from the electronic control units.

2)Keep the antenna feeder line more than 20 cm (8 in) away from the harness

of electronic controls.

Do not let them run parallel for a long distance.

3)Adjust the antenna and feeder line so that the standing-wave ratio can be kept smaller.

4)Be sure to ground the radio to vehicle body.

FUEL PUMP

●Do not operate fuel pump when there is no fuel in lines.

●Tighten fuel hose clamps to the specified torque.

ECM HARNESS HANDLING

●Securely connect ECM harness connectors.

A poor connection can cause an extremely high (surge) voltage to develop in coil and condenser, thus

resulting in damage to ICs.

●Keep ECM harness at least 10 cm (4 in) away from adjacent harness, to prevent an ECM system malfunction due to receiving external noise, degraded operation of ICs, etc.

●Keep ECM parts and harness dry.

●Before removing parts, turn off ignition switch and then disconnect battery ground cable.

SEF331WB

EC-QG-10

PRECAUTIONS	QG18DE

Precautions

Precautions

NCEC0005

+ 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

Protector

Lever

+When connecting or disconnecting ECM harness connector, use lever as shown.

When connecting, fasten connector securely with lever moved until it stops.

	Fasten	Loosen
		SEF908W

+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.

Bend	Break
	SEF291H

Perform ECM input/output signal inspection before replacement.

+Before replacing ECM, perform Terminals and Reference Value inspection and make sure ECM functions properly. Refer to EC-QG-101.

MEF040D

+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.

SAT652J

EC-QG-11

PRECAUTIONS	QG18DE

Wiring Diagrams and Trouble Diagnosis

Battery voltage

+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.

	Short	Harness connector	ECM
		for solenoid valve
			NG
	Solenoid valve
			OK
		Circuit tester

SEF348N

Wiring Diagrams and Trouble Diagnosis

NCEC0006

When you read Wiring diagrams, refer to the followings:

+``HOW TO READ WIRING DIAGRAMS'' in GI section

+``POWER SUPPLY ROUTING'' for power distribution circuit in EL section

When you perform trouble diagnosis, refer to the followings:

+``HOW TO FOLLOW TEST GROUP IN TROUBLE DIAGNOSIS'' in GI section

+``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT'' in GI section

EC-QG-12

	PREPARATION		QG18DE
		Special Service Tools
	Special Service Tools
			NCEC0007
Tool number	Description
Tool name
KV10117100		Loosening or tightening front heated oxygen sen-
Heated oxygen sensor		sor with 22 mm (0.87 in) hexagon nut
wrench

	NT379
KV10114400	Loosening or tightening rear heated oxygen sen-
Heated oxygen sensor	sor
wrench	a: 22 mm (0.87 in)
	NT636

	Commercial Service Tool
	NCEC0008
Tool name	Description
Fuel filler cap adapter	Checking fuel tank vacuum relief valve opening
	pressure

NT653

EC-QG-13

ENGINE AND EMISSION CONTROL OVERALL SYSTEM QG18DE

Engine Control Component Parts Location

Engine Control Component Parts Location

NCEC0009

EVAP canister purge volume control valve

Swirl control valve

One-way valve control solenoid valve

EGR temperature sensor

Fuel pressure regulator

Intake valve timing control solenoid valve

Condenser

Power steering oil pressure switch

Relay box

Camshaft position sensor (PHASE)

Engine coolant temperature sensor

Ignition coil (With power transistor) and spark plugs

Fuel injectors

PCV valve

Throttle position sensor & throttle position switch

Throttle opener

EVAP canister

Intake air temperature sensor

Mass air flow sensor

EGR volume control valve

IACV-AAC valve

Swirl control valve actuator

Front heated oxygen sensor

SEF909W

EC-QG-14

ENGINE AND EMISSION CONTROL OVERALL SYSTEM QG18DE

Engine Control Component Parts Location (Cont'd)

Fuel pressure	Front
regulator
Front
Condenser
Intake valve timing		EGR volume
control solenoid valve		control valve
	Front	Swirl control
EVAP canister		valve actuator
purge volume
control valve
Vacuum tank
One-way valve
Front
		EGR volume
		control valve
	View from the underside of the vehicle
Rocker cover
Front	Rear heated oxygen
	sensor harness

connector

Relay box

Rear heated oxygen sensor

Camshaft position sensor (PHASE)

Throttle opener

IACV-AAC valve

Mass air flow sensor

Air cleaner

Swirl control valve control solenoid valve

Air duct

Mass air flow sensor

Front

Knock sensor

Oil filter

Crankshaft position sensor (POS)

SEF910W

EC-QG-15

ENGINE AND EMISSION CONTROL OVERALL SYSTEM QG18DE

Engine Control Component Parts Location (Cont'd)

Fuel pump harness connector

ECM

Glove box

Fuel tank gauge unit

ECM harness harness connector connector

Under rear seat cushion

Fuse block	Fuel pump fuse	Relay box cover
		ECM relay
		(Self-shutoff)
		Fan motor relay
	Fuel pump
	relay

Front

Data link connector

SEF911W

EC-QG-16

17-QG-EC

FUSIBLE IGNITION SWITCH

LINK

OFFACC ON ST

FUSE

INJECTOR

No.1

No.2

No.3

No.4

BATTERY

ENGINE CONTROL MODULE

RELAY

				IGNITION COIL
				(With POWER	CONDENSER
				TRANSISTOR)
				SPARK
				PLUG
No. 1	No.2	No.3	No.4	IACV-AAC
				VALVE

EGR VOLUME

CONTROL

VALVE

CLOSED THROTTLE

POSITION SWITCH

WIDE CRANKSHAFT

OPEN POSITION

SENSOR (POS)

CAMSHAFT

POSITION

SENSOR (PHASE)

MASS AIR

FLOW SENSOR

THROTTLE

POSITION

SENSOR

REFRIGERANT

PRESSURE

SENSOR

ENGINE COOLANT

TEMPERATURE

SENSOR

INTAKE AIR

TEMPERATURE

SENSOR

EGR

TEMPERATURE

SENSOR

YEC258

DATA LINK CONNECTOR

115	93	114
101		86
103
105
107		22
43		21
41
67
31
110		14
112
35		1
36
37		104
38
		4
		62
		3
		63
6		106
		108
15
		13
	ECM
7		48
16		57
8
17		82
9
18		23
40		116
		50
85
		32
66		34
75
61		81
73
111
92		46
58
74
64		42
70		44

51

72

					FUSE			BATTERY
SPEED-
								(Via fusible link
OMETER	VEHICLE SPEED
	SENSOR
	MALFUNCTION
	INDICATOR	FUEL PUMP
		RELAY
								IGNITION SWITCH
								ON or START
	FUEL LAMP
EVAP CANISTER
PURGE VOLUME CONTROL
SOLENOID VALVE
	INTAKE VALVE
	TIMING CONTROL
	SOLENOID VALVE
SWIRL CONTROL
VALVE CONTROL
SOLENOID VALVE
				FRONT HEATED
				OXYGEN SENSOR
				REAR HEATED
				OXYGEN SENSOR
FUEL TANK
GAUGE UNIT
(FUEL TANK	COOLING	COOLING
TEMPERATURE	FAN MOTOR-1
		FAN RELAY
SENSOR)
	COOLING	A/C
		RELAY
	FAN MOTOR-2
							IGNITION SWITCH
NATS IMMU								ON
8
							To compressor
							To headlamp LH
COMBINATION					XH		To lighting switch
					HD		To headlamp relay LH
METER
11			TIME CONTROL UNIT
8					3		To rear defogger system
				14
					13
	KNOCK	POWER STEERING			AC	: With air conditioner
	SENSOR	OIL PRESSURE
		SWITCH			OA	: Without air conditioner
					HD	: With XENON headlamp or
						daytime light system
					XH	: Except		HD
	PARK/NEUTRAL
	POSITION SWITCH					FAN SWITCH			OA
		10			A/C CONTROL	OFF	1 2 3		4
					PANEL
		27
					AC

Diagram Circuit		CONTROL EMISSION AND ENGINE
		SYSTEM OVERALL
	Diagram Circuit
NCEC0010		QG18DE

18-QG-EC

Fuel tank

Fuel temperature sensor Fuel pump

EGR volume control valve

EGR temperature sensor

EVAP canister purge EVAP canister volume control

solenoid valve

Air cleaner

Intake air temperature sensor

Mass air flow sensor

SEF914W

One-way valve

Vacuum tank

Swirl Control Valve control solenoid valve

Swirl

control valve

Engine coolant temperature sensor

Knock sensor

IACV-

AAC valve

Throttle position sensor

Closed throttle position

switch

Three way catalyst

Fuel
pressure		Cooling fan
regulator
Swirl	Battery	Ignition switch
Control
Valve	ECM
actuator

Intake valve timing control solenoid valve

Fuel injector

Ignition coil and power transistor

Camshaft position sensor (PHASE)

Front heated oxygen sensor

Three way catalyst

Crankshaft position sensor (POS)

Rear heated oxygen sensor

Malfunction indicator

Vehicle speed sensor

Park / Neutral position switch

	Diagram System
Diagram System	CONTROL EMISSION AND ENGINE
	SYSTEM OVERALL
NCEC0011		QG18DE

ENGINE AND EMISSION CONTROL OVERALL SYSTEM QG18DE

Vacuum Hose Drawing

Vacuum Hose Drawing

NCEC0012

Refer to ``System Diagram'' on EC-QG-18 for vacuum control system.

		Vacuum tank
	Fuel pressure	One-way valve
		(coloured side should
	regulator
		face the vacuum source)

EVAP canister purge pipe

(to EVAP canister)

Swirl control valve	Swirl control valve
actuator	control solenoid valve

EVAP canister purge volume control solenoid valve

EVAP canister

SEF915W

EC-QG-19

	ENGINE AND EMISSION CONTROL OVERALL SYSTEM			QG18DE
	System Chart
		System Chart		NCEC0013
	Input (Sensor)	ECM Function	Output (Actuator)
	+ Camshaft position sensor (PHASE)	Fuel injection & mixture ratio control	Injectors
	+ Mass air flow sensor
		Electronic ignition system	Power transistor
	+ Engine coolant temperature sensor
	+ Front heated oxygen sensor	Idle air control system	IACV-AAC valve
	+ Ignition switch
	+ Throttle position sensor	Valve timing control	Intake valve timing control sole-
	+ PNP switch		noid valve
	+ Air conditioner switch
		Fuel pump control	Fuel pump relay
	+ Knock sensor
	+ EGR temperature sensor*1	Front heated oxygen sensor monitor & on	Malfunction indicator
	+ Crankshaft position sensor (POS)
		board diagnostic system	(On the instrument panel)
	+ Tank fuel temperature sensor*1
	+ Battery voltage	EGR control	EGR volume control valve
	+ Power steering oil pressure switch
		Front and rear heated oxygen sensor
	+ Vehicle speed sensor		Heated oxygen sensor heater
	+ Intake air temperature sensor	heater control
	+ Rear heated oxygen sensor*2
			EVAP canister purge volume con-
	+ Closed throttle position switch	EVAP canister purge flow control
			trol solenoid valve
	+ Electrical load
	+ Refrigerant pressure sensor	Cooling fan control	Cooling fan relay
		Air conditioning cut control	Air conditioner relay
		Swirl control valve control	Swirl Control Valve control sole-
			noid valve

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

EC-QG-20

ENGINE AND EMISSION BASIC CONTROL
	SYSTEM DESCRIPTION					QG18DE
			Multiport Fuel Injection (MFI) System
	Multiport Fuel Injection (MFI) System
DESCRIPTION						NCEC0014
Input/Output Signal Chart
						NCEC0014S01
Sensor	Input Signal to ECM		ECM func-		Actuator
			tion
Crankshaft position sensor (POS)	Engine speed and piston position
Camshaft position sensor (PHASE)	Cylinder number
Mass air flow sensor	Amount of intake air
Engine coolant temperature sensor	Engine coolant temperature
Front heated oxygen sensor	Density of oxygen in exhaust gas
Throttle position sensor	Throttle position
	Throttle valve idle position
			Fuel injec-
PNP switch	Gear position
			tion & mix-
				Injector
Vehicle speed sensor	Vehicle speed
			ture ratio
			control
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

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

Basic Multiport Fuel Injection System

NCEC0014S02

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.

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>

+During warm-up

+When starting the engine

+During acceleration

+Hot-engine operation

+High-load, high-speed operation

<Fuel decrease>

+During deceleration

+During high engine speed operation

+During high vehicle speed operation (M/T models)

+Extremely high engine coolant temperature

EC-QG-21

ENGINE AND EMISSION BASIC CONTROL	QG18DE
SYSTEM DESCRIPTION

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

Mixture Ratio Feedback Control (Closed loop control)

NCEC0014S04

	CLOSED LOOP CONTROL
		Injection pulse
	ECM	Injectors
	Feedback	Fuel
	signal	injection
	Front heated	Combustion
		Engine
	oxygen sensor

SEF336W

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-QG-157. 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

NCEC0014S05

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.

+Deceleration and acceleration

+High-load, high-speed operation

+Malfunction of front heated oxygen sensor or its circuit

+Insufficient activation of front heated oxygen sensor at low engine coolant temperature

+High engine coolant temperature

+During warm-up

+When starting the engine

Mixture Ratio Self-learning Control

NCEC0014S06

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.

EC-QG-22

ENGINE AND EMISSION BASIC CONTROL
	SYSTEM DESCRIPTION	QG18DE
	Multiport Fuel Injection (MFI) System (Cont'd)
Fuel Injection Timing		NCEC0014S07
● Sequential multiport fuel injection system	● Simultaneous multiport fuel injection system
Injection pulse
No. 1 cylinder	No. 1 cylinder
No. 2 cylinder	No. 2 cylinder
No. 3 cylinder	No. 3 cylinder
No. 4 cylinder	No. 4 cylinder
1 engine cycle	1 engine cycle	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.

Electronic Ignition (EI) System

DESCRIPTION

NCEC0015

Input/Output Signal Chart

NCEC0015S01

	Sensor	Input Signal to ECM	ECM func-	Actuator
			tion
	Crankshaft position sensor (POS)	Engine speed and piston position
	Camshaft position sensor (PHASE)	Cylinder number
	Mass air flow sensor	Amount of intake air
	Engine coolant temperature sensor	Engine coolant temperature
	Throttle position sensor	Throttle position	Ignition tim-
		Throttle valve idle position		Power transistor
			ing control
	Vehicle speed sensor	Vehicle speed
	Ignition switch	Start signal
	Knock sensor	Engine knocking
	PNP switch	Gear position
	Battery	Battery voltage

EC-QG-23

ENGINE AND EMISSION BASIC CONTROL	QG18DE
SYSTEM DESCRIPTION

Electronic Ignition (EI) System (Cont'd)

System Description

NCEC0015S02

Tp (msec)

1.75

Injection pulse width

1.50

1.25

1.00

0.75

600	1,000	1,400	1,800	2,200	N
	Engine speed (rpm)			SEF742M

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, crankshaft position sensor signal 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.

+At starting

+During warm-up

+At idle

+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

NCEC0016

Input/Output Signal Chart

NCEC0016S01

	Sensor	Input Signal to ECM	ECM func-	Actuator
			tion
	Air conditioner switch	Air conditioner ``ON'' signal
	Throttle position sensor	Throttle valve opening angle
	Crankshaft position sensor (POS)	Engine speed
			Air condi-
	Engine coolant temperature sensor	Engine coolant temperature
			tioner cut	Air conditioner relay
	Ignition switch	Start signal
			control
	Refrigerant pressure sensor	Refrigerant pressure
	Vehicle speed sensor	Vehicle speed
	Power steering oil pressure switch	Power steering operation

System Description

NCEC0016S02

This system improves engine operation when the air conditioner is used. Under the following conditions, the air conditioner is turned off.

+When the accelerator pedal is fully depressed.

+When cranking the engine.

+At high engine speeds.

+When the engine coolant temperature becomes excessively high.

EC-QG-24

ENGINE AND EMISSION BASIC CONTROL	QG18DE
SYSTEM DESCRIPTION

Fuel Cut Control (at no load & high engine speed)

+When operating power steering during low engine speed or low vehicle speed.

+When engine speed is excessively low.

Fuel Cut Control (at no load & high engine speed)

DESCRIPTION

NCEC0017

Input/Output Signal Chart

NCEC0017S01

	Sensor	Input Signal to ECM	ECM func-	Actuator
			tion
	Vehicle speed sensor	Vehicle speed
	PNP switch	Neutral position
			Fuel cut
	Throttle position sensor	Throttle position		Injectors
			control
	Engine coolant temperature sensor	Engine coolant temperature
	Crankshaft position sensor (POS)	Engine speed

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-QG-21.

Evaporative Emission System

DESCRIPTION

NCEC0018

Intake manifold

Throttle body

Purge line

EVAP canister purge volume control solenoid valve

	Relief of vacuum
	Sealing gas cap with	EVAP
	pressure relief valve		Air
		canister
	and vacuum relief
			Fuel vapor
	valve

SEF916W

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 volume control solenoid valve also shuts off the vapor purge line during decelerating and idling.

EC-QG-25

ENGINE AND EMISSION BASIC CONTROL	QG18DE
SYSTEM DESCRIPTION

Evaporative Emission System (Cont'd)

INSPECTION

NCEC0019

EVAP Canister

NCEC0019S01

Check EVAP canister as follows:

1.	Block port B. Orally blow air through port A. Check that air
Check valve	flows freely through port C with check valve resistance.
2.	Block port A. Orally blow air through port B. Check that air
	flows freely through port C.
SEF917W

		Valve B
		Valve A
		SEF918W
		Vacuum/Pressure gauge
		Vacuum/
	Fuel filler	Pressure
		pump
	cap

One-way valve

Fuel filler cap adapter

SEF943S

Fuel Tank Vacuum Relief Valve (Built into fuel filler

cap)

NCEC0019S03

1.Wipe clean valve housing.

2.Check valve opening pressure and vacuum.

Pressure:

16.0 - 20.0 kPa (0.16 - 0.20 bar, 0.163 - 0.204 kg/cm2, 2.32 - 2.90 psi)

Vacuum:

−6.0 to −3.5 kPa (−0.060 to −0.035 bar, −0.061 to −0.036 kg/cm 2, −0.87 to −0.51 psi)

3.If out of specification, replace fuel filler cap as an assembly.

Evaporative Emission (EVAP) Canister Purge Volume

Control Solenoid Valve

NCEC0019S07

Refer to EC-QG-268.

Tank Fuel Temperature Sensor

NCEC0019S08

Refer to EC-QG-224.

EC-QG-26

ENGINE AND EMISSION BASIC CONTROL	QG18DE
SYSTEM DESCRIPTION

Evaporative Emission System (Cont'd)

EVAPORATIVE EMISSION LINE DRAWING

NCEC0020

EVAP canister purge volume control solenoid valve

Vehicle front

To intake manifold

Intake manifold

From

fuel tank

Fuel filter

EVAP canister

NOTE: Do not use soapy water or any type of solvent while installing vacuum hoses or purge hoses.

SEF919W

EC-QG-27

ENGINE AND EMISSION BASIC CONTROL
	SYSTEM DESCRIPTION		QG18DE
Positive Crankcase Ventilation
	Positive Crankcase Ventilation
DESCRIPTION			NCEC0022
Cruising	Acceleration or high load
	PCV valve operation
	Engine not running	Cruising
	or backfiring
PCV valve	PCV valve
	Idling or	Acceleration
	decelerating	or high load
Fresh air
Blow-by gas
			SEF921W

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.

INSPECTION

NCEC0023

PCV (Positive Crankcase Ventilation) Valve

NCEC0023S01

With engine running at idle, remove PCV valve from breather separator. 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.

SEC137A

Ventilation Hose

NCEC0023S02

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.

ET277

EC-QG-28

BASIC SERVICE PROCEDURE

QG18DE

Fuel Pressure Release

PEF823K

Fuel pump fuse

Fuel pump relay

Data link connector

SEF922W

Fuel pressure gauge

Fuel filter

SEF925W

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 PRES 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. Refer to fuse block cover for fuse

location.

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.

Fuel Pressure Check

NCEC0025

+When reconnecting fuel line, always use new clamps.

+Make sure that clamp screw does not contact adjacent

parts.

+Use a torque driver to tighten clamps.

+Use Pressure Gauge to check fuel pressure.

+Do not perform fuel pressure check with system operating. Fuel pressure gauge may indicate false readings.

1.Release fuel pressure to zero.

2.Disconnect fuel hose between fuel filter and fuel tube (engine side).

3.Install pressure gauge between fuel filter and fuel tube.

4.Start engine and check for fuel leakage.

5.Read the indication of fuel pressure gauge.

At idle speed:

With vacuum hose connected

Approximately 235 kPa (2.35 bar, 2.4 kg/cm2, 34 psi)

With vacuum hose disconnected

Approximately 294 kPa (2.94 bar, 3.0 kg/cm2, 43 psi)

EC-QG-29

BASIC SERVICE PROCEDURE	QG18DE

Fuel Pressure Regulator Check

If results are unsatisfactory, perform Fuel Pressure Regulator

Check, EC-QG-30.

		Fuel Pressure Regulator Check
		1.	NCEC0026
Vacuum	Fuel pressure		Stop engine and disconnect fuel pressure regulator vacuum
			hose from intake manifold.
		2.	Plug intake manifold with a rubber cap.
		3.	Connect variable vacuum source to fuel pressure regulator.
		4.	Start engine and read indication of fuel pressure gauge as
	To pressure regulator		vacuum is changed.
		Fuel pressure should decrease as vacuum increases. If results
		are unsatisfactory, replace fuel pressure regulator.
	SEF718B

Engine front

SEF926W

Installing condition

Fuel tube

Clip

Align protrusions.

	Protrusion
Fuel injector	Clip mounting groove
	SEF927W

Injector

REMOVAL AND INSTALLATION

NCEC0027

1.Release fuel pressure to zero.

2.Remove fuel tube assemblies in numerical sequence as shown in the Figure at left.

3.Expand and remove clips securing fuel injectors.

4.Extract fuel injectors straight from fuel tubes.

+Be careful not to damage injector nozzles during removal.

+Do not bump or drop fuel injectors.

+Do not disassemble or adjust fuel injectors.

5.Install fuel injectors.

Carefully install O-rings, including the one used with the pressure regulator.

+Use bare hands to install O-rings. Do not wear gloves.

+Apply a coat of engine oil (with a low viscosity of 5W-30, etc.) to O-rings before installation.

+Do not use solvent to clean O-rings and other parts.

+Make sure that O-rings and other parts are clean and free from foreign particles.

+Be careful not to damage O-rings with service tools or finger nails. Do not expand or twist O-rings. If stretched, do not insert them into fuel tubes immediately after stretching.

+Always insert O-rings straight into fuel tubes. Do not tilt or rotate them during installation.

6.Position clips in grooves on fuel injectors.

+Make sure that protrusions of fuel injectors are aligned with cutouts of clips after installation.

EC-QG-30