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ENGINE CONTROL SYSTEM
EC
GI
SECTION MA
EM
LC
CONTENTS
EC
DIAGNOSTIC TROUBLE CODE INDEX.................... 4 Idle Speed/Ignition Timing/Idle Mixture Ratio
Alphabetical & P No. Index for DTC....................... 4 Adjustment ............................................................ 37
PRECAUTIONS AND PREPARATION....................... 6 ON BOARD DIAGNOSTIC SYSTEM FE
Special Service Tools.............................................. 6 DESCRIPTION .......................................................... 43
Commercial Service Tools ...................................... 6 Introduction ........................................................... 43
Supplemental Restraint System (SRS) "AIR Two Trip Detection Logic ...................................... 43
CL
BAG" and "SEAT BELT PRE-TENSIONER"........... 8 Emission-related Diagnostic Information .............. 44
Precautions for On Board Diagnostic (OBD) Malfunction Indicator Lamp (MIL) ......................... 58 MT
System of Engine and A/T...................................... 8 OBD System Operation Chart .............................. 62
Engine Fuel & Emission Control System ............... 9 CONSULT-II .......................................................... 67
Precautions ........................................................... 10 Generic Scan Tool (GST) ..................................... 78 AT
ENGINE AND EMISSION CONTROL OVERALL TROUBLE DIAGNOSIS -- Introduction................. 80
SYSTEM.................................................................... 12 Introduction ........................................................... 80
Circuit Diagram ..................................................... 12 Diagnostic Worksheet ........................................... 80 FA
Engine Control Component Parts Location .......... 13 TROUBLE DIAGNOSIS -- Work Flow ................... 82
System Diagram ................................................... 15 Work Flow ............................................................. 82 RA
Vacuum Hose Drawing ......................................... 16 Description for Work Flow .................................... 83
System Chart ........................................................ 17 TROUBLE DIAGNOSIS -- Basic Inspection ......... 84
ENGINE AND EMISSION BASIC CONTROL Basic Inspection.................................................... 84 BR
SYSTEM DESCRIPTION .......................................... 18 TROUBLE DIAGNOSIS -- General Description ... 90
Multiport Fuel Injection (MFI) System................... 18 Diagnostic Trouble Code (DTC) Inspection
Distributor Ignition (DI) System............................. 20 Priority Chart ......................................................... 90 ST
Air Conditioning Cut Control ................................. 21 Fail-Safe Chart...................................................... 91
Fuel Cut Control.................................................... 22 Symptom Matrix Chart .......................................... 92
RS
EVAPORATIVE EMISSION SYSTEM ...................... 23 CONSULT-II Reference Value in Data Monitor
Description ............................................................ 23 Mode ..................................................................... 95
Inspection.............................................................. 23 Major Sensor Reference Graph in Data BT
Evaporative Emission Line Drawing ..................... 26 Monitor Mode ........................................................ 97
On Board Refueling Vapor Recovery (ORVR) ..... 28 ECM Terminals and Reference Value................... 99
POSITIVE CRANKCASE VENTILATION................. 33 TROUBLE DIAGNOSIS FOR INTERMITTENT HA
Description ............................................................ 33 INCIDENT................................................................ 109
Inspection.............................................................. 33 Description .......................................................... 109
EL
BASIC SERVICE PROCEDURE .............................. 34 Common I/I Report Situations ............................ 109
Fuel Pressure Release ......................................... 34 Diagnostic Procedure.......................................... 109
Fuel Pressure Check ............................................ 34 TROUBLE DIAGNOSIS FOR POWER SUPPLY... 110 IDX
Fuel Pressure Regulator Check ........................... 35 Main Power Supply and Ground Circuit ............. 110
Injector Removal and Installation ......................... 35 TROUBLE DIAGNOSIS FOR DTC P0100............. 115
Fast Idle Cam (FIC) .............................................. 35 Mass Air Flow Sensor (MAFS) ........................... 115
CONTENTS (Cont'd.)
TROUBLE DIAGNOSIS FOR DTC P0105 (WITH TROUBLE DIAGNOSIS FOR DTC P0180............. 242
EXTERNAL ABSOLUTE PRESSURE SENSOR).. 124 Fuel Tank Temperature Sensor........................... 242
Absolute Pressure Sensor .................................. 124 TROUBLE DIAGNOSIS FOR DTC P0300 -
TROUBLE DIAGNOSIS FOR DTC P0105 P0304 ...................................................................... 246
(WITHOUT EXTERNAL ABSOLUTE No. 4 - 1 Cylinder Misfire, Multiple Cylinder
PRESSURE SENSOR) ........................................... 129 Misfire.................................................................. 246
Absolute Pressure Sensor .................................. 129 TROUBLE DIAGNOSIS FOR DTC P0325............. 251
TROUBLE DIAGNOSIS FOR DTC P0110 ............. 130 Knock Sensor (KS) ............................................. 251
Intake Air Temperature Sensor ........................... 130 TROUBLE DIAGNOSIS FOR DTC P0335............. 256
TROUBLE DIAGNOSIS FOR DTC P0115 ............. 136 Crankshaft Position Sensor (CKPS) (OBD) ....... 256
Engine Coolant Temperature Sensor (ECTS) .... 136 TROUBLE DIAGNOSIS FOR DTC P0340............. 261
TROUBLE DIAGNOSIS FOR DTC P0120............. 141 Camshaft Position Sensor (CMPS) .................... 261
Throttle Position Sensor ..................................... 141 TROUBLE DIAGNOSIS FOR DTC P0400............. 268
TROUBLE DIAGNOSIS FOR DTC P0125............. 154 EGR Function (Close)......................................... 268
Engine Coolant Temperature (ECT) Sensor....... 154 TROUBLE DIAGNOSIS FOR DTC P0402............. 277
TROUBLE DIAGNOSIS FOR DTC P0130............. 159 EGRC-BPT Valve Function................................. 277
Front Heated Oxygen Sensor (Circuit) (Front TROUBLE DIAGNOSIS FOR DTC P0420............. 282
HO2S) ................................................................. 159 Three Way Catalyst Function ............................. 282
TROUBLE DIAGNOSIS FOR DTC P0131............. 166 TROUBLE DIAGNOSIS FOR DTC P0440............. 286
Front Heated Oxygen Sensor (Lean Shift Evaporative Emission (EVAP) Control System
Monitoring) (Front HO2S) ................................... 166 (Small Leak) (Negative Pressure) ...................... 286
TROUBLE DIAGNOSIS FOR DTC P0132............. 174 TROUBLE DIAGNOSIS FOR DTC P0443............. 295
Front Heated Oxygen Sensor (Rich Shift Evaporative Emission (EVAP) Canister Purge
Monitoring) (Front HO2S) ................................... 174 Volume Control Solenoid Valve .......................... 295
TROUBLE DIAGNOSIS FOR DTC P0133............. 182 TROUBLE DIAGNOSIS FOR DTC P0446............. 301
Front Heated Oxygen Sensor (Response Evaporative Emission (EVAP) Canister Vent
Monitoring) (Front HO2S) ................................... 182 Control Valve (Circuit)......................................... 301
TROUBLE DIAGNOSIS FOR DTC P0134............. 190 TROUBLE DIAGNOSIS FOR DTC P0450............. 306
Front Heated Oxygen Sensor (High Voltage) Evaporative Emission (EVAP) Control System
(Front HO2S) ...................................................... 190 Pressure Sensor ................................................. 306
TROUBLE DIAGNOSIS FOR DTC P0135............. 197 TROUBLE DIAGNOSIS FOR DTC P0455............. 312
Front Heated Oxygen Sensor Heater................. 197 Evaporative Emission (EVAP) Control System
TROUBLE DIAGNOSIS FOR DTC P0137............. 201 (Large Leak)........................................................ 312
Rear Heated Oxygen Sensor (Min. Voltage TROUBLE DIAGNOSIS FOR DTC P0460............. 321
Monitoring) (Rear HO2S).................................... 201 Fuel Level Sensor Function (Slosh) ................... 321
TROUBLE DIAGNOSIS FOR DTC P0138............. 209 TROUBLE DIAGNOSIS FOR DTC P0461............. 324
Rear Heated Oxygen Sensor (Max. Voltage Fuel Level Sensor Function................................ 324
Monitoring) (Rear HO2S).................................... 209 TROUBLE DIAGNOSIS FOR DTC P0464............. 326
TROUBLE DIAGNOSIS FOR DTC P0139............. 216 Fuel Level Sensor Circuit ................................... 326
Rear Heated Oxygen Sensor (Response TROUBLE DIAGNOSIS FOR DTC P0500............. 329
Monitoring) (Rear HO2S).................................... 216 Vehicle Speed Sensor (VSS).............................. 329
TROUBLE DIAGNOSIS FOR DTC P0140............. 222 TROUBLE DIAGNOSIS FOR DTC P0505............. 333
Rear Heated Oxygen Sensor (High Voltage) Idle Air Control Valve (IACV) -- Auxiliary Air
(Rear HO2S) ....................................................... 222 Control (AAC) Valve............................................ 333
TROUBLE DIAGNOSIS FOR DTC P0141............. 228 TROUBLE DIAGNOSIS FOR DTC P0510............. 339
Rear Heated Oxygen Sensor Heater ................. 228 Closed Throttle Position Switch.......................... 339
TROUBLE DIAGNOSIS FOR DTC P0171............. 232 TROUBLE DIAGNOSIS FOR DTC P0600............. 345
Fuel Injection System Function (Lean side) ....... 232 A/T Control.......................................................... 345
TROUBLE DIAGNOSIS FOR DTC P0172............. 237 TROUBLE DIAGNOSIS FOR DTC P0605............. 349
Fuel Injection System Function (Rich side)........ 237 Engine Control Module (ECM)............................ 349
EC-2
CONTENTS (Cont'd.)
TROUBLE DIAGNOSIS FOR DTC P1126 ............. 351 TROUBLE DIAGNOSIS FOR DTC P1448............. 414
Thermostat Function ........................................... 351 Evaporative Emission (EVAP) Canister Vent
GI
TROUBLE DIAGNOSIS FOR DTC P1148 ............. 352 Control Valve (Open) .......................................... 414
Closed Loop Control ........................................... 352 TROUBLE DIAGNOSIS FOR DTC P1464............. 421 MA
TROUBLE DIAGNOSIS FOR DTC P1320............. 355 Fuel Level Sensor Circuit (Ground signal) ......... 421
Ignition Signal ..................................................... 355 TROUBLE DIAGNOSIS FOR DTC P1490............. 424
TROUBLE DIAGNOSIS FOR DTC P1336............. 362 Vacuum Cut Valve Bypass Valve (Circuit).......... 424 EM
Crankshaft Position Sensor (CKPS) (OBD) TROUBLE DIAGNOSIS FOR DTC P1491............. 429
(COG).................................................................. 362 Vacuum Cut Valve Bypass Valve........................ 429
TROUBLE DIAGNOSIS FOR DTC P1400............. 367 TROUBLE DIAGNOSIS FOR DTC P1605............. 434 LC
EGRC-Solenoid Valve......................................... 367 A/T Diagnosis Communication Line ................... 434
TROUBLE DIAGNOSIS FOR DTC P1401............. 372 TROUBLE DIAGNOSIS FOR DTC P1706............. 438
EC
EGR Temperature Sensor .................................. 372 Park/Neutral Position (PNP) Switch ................... 438
TROUBLE DIAGNOSIS FOR DTC P1402............. 378 TROUBLE DIAGNOSIS FOR OVERHEAT ............ 443
EGR Function (Open) ......................................... 378 Overheat ............................................................. 443 FE
TROUBLE DIAGNOSIS FOR DTC P1441............. 385 TROUBLE DIAGNOSIS FOR
Evaporative Emission (EVAP) Control System NON-DETECTABLE ITEMS ................................... 455
(Very Small Leak) ............................................... 385 Injector ................................................................ 455 CL
TROUBLE DIAGNOSIS FOR DTC P1444............. 395 Start Signal ......................................................... 458
Evaporative Emission (EVAP) Canister Purge Fuel Pump........................................................... 461
MT
Volume Control Solenoid Valve .......................... 395 Power Steering Oil Pressure Switch .................. 466
TROUBLE DIAGNOSIS FOR DTC P1446............. 402 IACV-FICD Solenoid Valve ................................. 470
Evaporative Emission (EVAP) Canister Vent Electric Load Signal ............................................ 474 AT
Control Valve (Close).......................................... 402 MIL & Data Link Connectors............................... 477
TROUBLE DIAGNOSIS FOR DTC P1447............. 407 SERVICE DATA AND SPECIFICATIONS (SDS) ... 478
Evaporative Emission (EVAP) Control System General Specifications ........................................ 478 FA
Purge Flow Monitoring........................................ 407 Inspection and Adjustment.................................. 478
When you read wiring diagrams: RA
q Read GI section, ``HOW TO READ WIRING DIAGRAMS''.
q Read EL section, ``POWER SUPPLY ROUTING'' for power distribution circuit.
When you perform trouble diagnoses, read GI section, ``HOW TO FOLLOW FLOW CHART IN BR
TROUBLE DIAGNOSES'' and ``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL
INCIDENT''.
ST
RS
BT
HA
EL
IDX
EC-3
DIAGNOSTIC TROUBLE CODE INDEX
Alphabetical & P No. Index for DTC
ALPHABETICAL INDEX FOR DTC
DTC*6 DTC*6
Items Reference Items Reference
(CONSULT-II screen terms) CONSULT-II page (CONSULT-II screen terms) CONSULT-II page
ECM*1 ECM*1
GST*2 GST*2
Unable to access ECM -- -- EC-91 FUEL TEMP SEN/CIRC P0180 0402 EC-242
*COOLAN T SEN/CIRC P0125 0908 EC-154 IACV/AAC VLV/CIRC P0505 0205 EC-333
A/T 1ST GR FNCTN P0731 1103 AT-96 IGN SIGNAL-PRIMARY P1320 0201 EC-355
A/T 2ND GR FNCTN P0732 1104 AT-102 KNOCK SEN/CIRCUIT P0325 0304 EC-251
A/T 3RD GR FNCTN P0733 1105 AT-108 L/PRESS SOL/CIRC P0745 1205 AT-134
A/T 4TH GR FNCTN P0734 1106 AT-114 MAF SEN/CIRCUIT*3 P0100 0102 EC-115
A/T COMM LINE P0600 -- EC-345 MULTI CYL MISFIRE P0300 0701 EC-246
A/T DIAG COMM LINE P1605 0804 EC-434 EC-57 or
NATS MALFUNC -- --
A/T TCC S/V FNCTN P0744 1107 AT-126 EL-250
ABSL PRES SEN/CIRC P0105 0803 EC-124 NO SELF DIAGNOSTIC Flash-
No DTC EC-58
FAILURE INDICATED ing*5
AIR TEMP SEN/CIRC P0110 0401 EC-130
O/R CLTCH SOL/CIRC P1760 1203 AT-156
ATF TEMP SEN/CIRC P0710 1208 AT-83
OVERHEAT -- 0208 EC-443
CAM POS SEN/CIR P0340 0101 EC-261
P-N POS SW/CIRCUIT P1706 1003 EC-438
CLOSED LOOP P1148 0307 EC-352
PNP SW/CIRC P0705 1101 AT-78
CLOSED TP SW/CIRC P0510 0203 EC-339
PURG VOLUME CONT/V P1444 0214 EC-395
COOLANT T SEN/CIRC P0115 0103 EC-136
PURG VOLUME CONT/V P0443 1008 EC-295
CPS/CIRC (OBD) COG P1336 0905 EC-362
REAR O2 SENSOR P0138 0510 EC-209
CPS/CIRCUIT (OBD) P0335 0802 EC-256
REAR O2 SENSOR P0137 0511 EC-201
CYL 1 MISFIRE P0301 0608 EC-246
REAR O2 SENSOR P0140 0512 EC-222
CYL 2 MISFIRE P0302 0607 EC-246
REAR O2 SENSOR P0139 0707 EC-216
CYL 3 MISFIRE P0303 0606 EC-246
RR O2 SEN HEATER P0141 0902 EC-228
CYL 4 MISFIRE P0304 0605 EC-246
SFT SOL A/CIRC*3 P0750 1108 AT-139
ECM P0605 0301 EC-349
SFT SOL B/CIRC*3 P0755 1201 AT-144
EGR SYSTEM P0400 0302 EC-268
TCC SOLENOID/CIRC P0740 1204 AT-121
EGR SYSTEM P1402 0514 EC-378
THERMOSTAT FNCTN P1126 1302 EC-351
EGR TEMP SEN/CIRC P1401 0305 EC-372
THRTL POS SEN/CIRC*3 P0120 0403 EC-141
EGRC SOLENOID/V P1400 1005 EC-367
TP SEN/CIRC A/T*3 P1705 1206 AT-149
EGRC-BPT VALVE P0402 0306 EC-277
TW CATALYST SYSTEM P0420 0702 EC-282
ENGINE SPEED SIG P0725 1207 AT-92
VC CUT/V BYPASS/V P1491 0311 EC-429
EVAP PURG FLOW/MON P1447 0111 EC-407
VC/V BYPASS/V P1490 0801 EC-424
EVAP SMALL LEAK P0440 0705 EC-286
VEH SPD SEN/CIR AT*4 P0720 1102 AT-88
EVAPO SYS PRES SEN P0450 0704 EC-306
VEH SPEED SEN/CIRC P0500 0104 EC-329
EVAP GROSS LEAK P0455 0714 EC-312
VENT CONTROL VALVE P1446 0215 EC-402
EVAP V/S LEAK P1441 0809 EC-385
VENT CONTROL VALVE P1448 0309 EC-414
FUEL LEVL SEN/CIR P0464 0810 EC-326
VENT CONTROL VALVE P0446 0903 EC-301
FUEL LV SE (SLOSH) P0460 0812 EC-321
FUEL LEVEL SENSOR P0461 0811 EC-324 *1: In Diagnostic Test Mode II (Self-diagnostic results).
These numbers are controlled by NISSAN.
FUEL LEVL SEN/CIR P1464 0814 EC-421 *2: These numbers are prescribed by SAE J2012.
FRONT O2 SENSOR P0130 0303 EC-159 *3: When the fail-safe operation occurs, the MIL illumi-
FR O2 SEN HEATER P0135 0901 EC-197 nates.
*4: The MIL illuminates when both the "Revolution sensor
FRONT O2 SENSOR P0133 0409 EC-182
signal" and the "Vehicle speed sensor" meet the fail-
FRONT O2 SENSOR P0132 0410 EC-174 safe condition at the same time.
FRONT O2 SENSOR P0131 0411 EC-166 *5: While engine is running.
FRONT O2 SENSOR P0134 0412 EC-190
*6: 1st trip DTC No. is the same as DTC No.
FUEL SYS DIAG-LEAN P0171 0115 EC-232
FUEL SYS DIAG-RICH P0172 0114 EC-237
EC-4
DIAGNOSTIC TROUBLE CODE INDEX
Alphabetical & P No. Index for DTC (Cont'd)
P NO. INDEX FOR DTC
DTC*6 DTC*6
Items Reference Items Reference
CONSULT-II
ECM*1 (CONSULT-II screen terms) page CONSULT-II
ECM*1 (CONSULT-II screen terms) page GI
GST*2 GST*2
-- -- Unable to access ECM EC-91 P0510 0203 CLOSED TP SW/CIRC EC-339
-- -- NATS MALFUNC
EC-57 or EL P0600 -- A/T COMM LINE EC-345 MA
section P0605 0301 ECM EC-349
Flash- NO SELF DIAGNOSTIC P0705 1101 PNP SW/CIRC AT-76
No DTC EC-58
ing*5 FAILURE INDICATED EM
P0710 1208 ATF TEMP SEN/CIRC AT-81
P0100 0102 MAF SEN/CIRCUIT*3 EC-115
P0720 1102 VEH SPD SEN/CIR AT*4 AT-86
P0105 0803 ABSL PRES SEN/CIRC EC-124
P0725 1207 ENGINE SPEED SIG AT-90
P0110 0401 AIR TEMP SEN/CIRC EC-130 LC
P0731 1103 A/T 1ST GR FNCTN AT-94
P0115 0103 COOLANT T SEN/CIRC EC-136
P0732 1104 A/T 2ND GR FNCTN AT-101
P0120 0403 THRTL POS SEN/CIRC*3 EC-141
P0125 0908 *COOLAN T SEN/CIRC EC-154
P0733 1105 A/T 3RD GR FNCTN AT-107 EC
P0734 1106 A/T 4TH GR FNCTN AT-113
P0130 0303 FRONT O2 SENSOR EC-159
P0740 1204 TCC SOLENOID/CIRC AT-122
P0131 0411 FRONT O2 SENSOR EC-166
P0744 1107 A/T TCC S/V FNCTN AT-127 FE
P0132 0410 FRONT O2 SENSOR EC-174
P0745 1205 L/PRESS SOL/CIRC AT-135
P0133 0409 FRONT O2 SENSOR EC-182
P0750 1108 SFT SOL A/CIRC*3 AT-140
P0134 0412 FRONT O2 SENSOR EC-190 CL
P0755 1201 SFT SOL B/CIRC*3 AT-145
P0135 0901 FR O2 SEN HEATER EC-197
P1126 1302 THERMOSTAT FNCTN EC-351
P0137 0511 REAR O2 SENSOR EC-201
P0138 0510 REAR O2 SENSOR EC-209
P1148 0307 CLOSED LOOP EC-352 MT
P1320 0201 IGN SIGNAL-PRIMARY EC-355
P0139 0707 REAR O2 SENSOR EC-216
P1336 0905 CPS/CIRC (OBD) COG EC-362
P0140 0512 REAR O2 SENSOR EC-222
P1400 1005 EGRC SOLENOID/V EC-367 AT
P0141 0902 RR O2 SEN HEATER EC-228
P1401 0305 EGR TEMP SEN/CIRC EC-372
P0171 0115 FUEL SYS DIAG-LEAN EC-232
P1402 0514 EGR SYSTEM EC-378
P0172 0114 FUEL SYS DIAG-RICH EC-237
P1441 0809 EVAP V/S LEAK EC-385
FA
P0180 0402 FUEL TEMP SEN/CIRC EC-242
P1444 0214 PURG VOLUME CONT/V EC-395
P0300 0701 MULTI CYL MISFIRE EC-246
P1446 0215 VENT CONTROL VALVE EC-402
P0301 0608 CYL 1 MISFIRE EC-246 RA
P1464 0814 FUEL LEVL SEN/CIR EC-421
P0302 0607 CYL 2 MISFIRE EC-246
P1447 0111 EVAP PURG FLOW/MON EC-407
P0303 0606 CYL 3 MISFIRE EC-246
P1448 0309 VENT CONTROL VALVE EC-414 BR
P0304 0605 CYL 4 MISFIRE EC-246
P1490 0801 VC/V BYPASS/V EC-424
P0325 0304 KNOSK SEN/CIRCUIT EC-251
P1491 0311 VC CUT/V BYPASS/V EC-429
P0335 0802 CPS/CIRCUIT (OBD) EC-256
P1605 0804 A/T DIAG COMM LINE EC-434
ST
P0340 0101 CAM POS SEN/CIR EC-261
P1705 1206 TP SEN/CIRC A/T*3 AT-150
P0400 0302 EGR SYSTEM EC-268
P1706 1003 P-N POS SW/CIRCUIT EC-438
P0402 0306 EGRC-BPT VALVE EC-277 RS
P1760 1203 O/R CLTCH SOL/CIRC AT-157
P0420 0702 TW CATALYST SYSTEM EC-282
-- 0208 OVERHEAT EC-443
P0440 0705 EVAP SMALL LEAK EC-286
P0443 1008 PURG VOLUME CONT/V EC-295 *1: In Diagnostic Test Mode II (Self-diagnostic results). BT
These numbers are controlled by NISSAN.
P0446 0903 VENT CONTROL VALVE EC-301
*2: These numbers are prescribed by SAE J2012.
P0450 0704 EVAPO SYS PRES SEN EC-306 *3: When the fail-safe operation occurs, the MIL illumi- HA
P0455 0714 EVAP GROSS LEAK EC-312 nates.
P0460 0812 FUEL LV SE (SLOSH) EC-321
*4: The MIL illuminates when both the "Revolution sensor
signal" and the "Vehicle speed sensor" meet the fail-
P0461 0811 FUEL LEVEL SENSOR EC-324 safe condition at the same time. EL
P0464 0810 FUEL LEVL SEN/CIR EC-326 *5: While engine is running.
P0500 0104 VEH SPEED SEN/CIRC*4 EC-329 *6: 1st trip DTC No. is the same as DTC No.
P0505 0205 IACV/AAC VLV/CIRC EC-333 IDX
EC-5
PRECAUTIONS AND PREPARATION
Special Service Tools
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.) Description
Tool name
KV10117100 Loosening or tightening front heated oxygen
(J36471-A) sensor with 22 mm (0.87 in) hexagon nut
Heated oxygen sensor
wrench
NT379
KV10114400 Loosening or tightening rear heated oxygen
(J-38365) sensor
Heated oxygen sensor
wrench
NT636 a: 22 mm (0.87 in)
(J-44321) Checking fuel pressure
Fuel pressure gauge kit
LEC642
Commercial Service Tools
Tool name Description
Fuel filler cap adapter Checking fuel tank vacuum relief valve open-
ing pressure
NT653
Leak detector When locating the EVAP leak
(J41416)
NT703
EVAP service port adapter When applying positive pressure through
(J41413-OBD) EVAP service port
NT704
EC-6
PRECAUTIONS AND PREPARATION
Commercial Service Tools (Cont'd)
Tool name Description
Oxygen sensor thread Reconditioning the exhaust system threads
cleaner before installing a new oxygen sensor. Use GI
(J-43897-18) with anti-seize lubricant shown below.
(J-43897-12)
MA
a: J-43897-18 18 mm diameter, for Zirconia
Oxygen Sensor EM
b: J-43897-12 12 mm diameter, for Titania
NT778 Oxygen Sensor
Anti-seize lubricant (Perma- Lubricating oxygen sensor thread cleaning
LC
texTM 133AR or equivalent tool when reconditioning exhaust system
meeting MIL specification threads.
MIL-A-907)
EC
FE
NT779
CL
MT
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
EC-7
PRECAUTIONS AND PREPARATION
Supplemental Restraint System (SRS) "AIR
BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER" used along
with a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. The SRS system composition which is available to NISSAN MODEL L30 is as follows
(The composition varies according to the optional equipment):
q For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the
steering wheel), front passenger air bag module (located on the instrument panel on passenger side),
seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
q For a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front
seat), satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision),
wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in the RS section of this Service Manual.
WARNING:
q 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.
q Improper 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, see the RS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in
this Service Manual. Spiral cable and wiring harnesses (except "SEAT BELT PRE-TEN-
SIONER") covered with yellow insulation either just before the harness connectors or for the
complete harness are related to the SRS.
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn
the driver of a malfunction causing emission deterioration.
CAUTION:
q Be sure to turn the ignition switch "OFF" and disconnect the negative battery terminal before
any repair or inspection work. The open/short circuit of related switches, sensors, solenoid
valves, etc. will cause the MIL to light up.
q Be sure to connect and lock the connectors securely after work. A loose (unlocked) connec-
tor 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.)
q Certain systems and components, especially those related to OBD, may use a new style
slide-locking type harness connector.
For description and how to disconnect, refer to EL-5 section ("Description", "HARNESS CON-
NECTOR").
q Be sure to route and secure the harnesses properly after work. The interference of the har-
ness with a bracket, etc. may cause the MIL to light up due to the short circuit.
q Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber
tube may cause the MIL to light up due to the malfunction of the EGR system or fuel injection
system, etc.
q Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM
and TCM (Transmission control module) before returning the vehicle to the customer.
EC-8
PRECAUTIONS AND PREPARATION
Engine Fuel & Emission Control System
GI
MA
EM
LC
EC
FE
CL
MT
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
AEC878A
EC-9
PRECAUTIONS AND PREPARATION
Precautions
q 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
q When connecting ECM harness connector, tighten
securing bolt until the gap between orange indicators
disappears.
: 3.0 - 5.0 N m(0.3 - 0.5 kg-m, 26 - 43 in-lb)
SEF308Q
q 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 terminal, when connecting pin connectors.
SEF291H
q Before replacing ECM, perform Terminals and Refer-
ence Value inspection and make sure ECM functions
properly. Refer to EC-99.
MEF040D
q After performing each TROUBLE DIAGNOSIS, perform
"OVERALL FUNCTION CHECK" or "DTC (Diagnostic
Trouble Code) CONFIRMATION PROCEDURE".
The DTC should not be displayed in the "DIAGNOSTIC
TROUBLE CODE CONFIRMATION PROCEDURE" if the
repair is completed. The "OVERALL FUNCTION
CHECK" should be a good result if the repair is com-
pleted.
SEF217U
EC-10
PRECAUTIONS AND PREPARATION
Precautions (Cont'd)
q 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 GI
and damage the ECM power transistor.
MA
EM
LC
EC
FE
CL
SEF348N
MT
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
EC-11
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Circuit Diagram
WEC822
EC-12
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location
GI
MA
EM
LC
EC
FE
CL
MT
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
WEC055
EC-13
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location
(Cont'd)
SEF469U SEF468U
WEC823
EC-14
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Diagram
GI
MA
EM
LC
EC
FE
CL
MT
AT
FA
RA
BR
ST
RS
BT
HA
EL
IDX
WEC824
EC-15
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Vacuum Hose Drawing
WEC054
Note: Do not use soapy water or any type of solvent while installing vacuum hoses or purge
hoses.
Refer to "System Diagram", EC-15, for vacuum control system.
EC-16
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Chart
Camshaft position sensor Fuel injection & mixture ratio Injectors GI
control
Mass air flow sensor
MA
Engine coolant temperature sensor
Distributor ignition system Power transistor
Front heated oxygen sensor EM
Ignition switch
Idle air control system IACV-AAC valve and LC
IACV-FICD solenoid valve
Throttle position sensor
*4 EC
Closed throttle position switch Fuel pump control Fuel pump relay
Park/neutral position (PNP) switch
FE
Air conditioner switch Front heated oxygen sensor
monitor & on board diagnostic Malfunction indicator lamp CL
system (On the instrument panel)
Knock sensor
MT
Intake air temperature sensor
*1 EGR control EGRC-solenoid valve
q EGR temperature sensor
AT
q EVAP control system pressure ECM
sensor
q Fuel level sensor
Front heated oxygen sensor Front heated oxygen sensor FA
heater control heater
Absolute pressure sensor
(if equipped)
RA
Battery voltage
Rear heated oxygen sensor Rear heated oxygen sensor
heater control heater BR
Power steering oil pressure switch
Vehicle speed sensor ST
EVAP canister purge flow con- EVAP canister purge volume
*1 trol control solenoid valve
Fuel tank temperature sensor
RS
*1
Crankshaft position sensor (OBD)
Air conditioning cut control Air conditioner relay BT
*3
Rear heated oxygen sensor
HA
*2 q EVAP canister vent control
TCM (Transmission control module)
valve
q Vacuum cut valve bypass
valve EL
Electrical load
Ambient air temperature switch IDX
*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis.
*2: The DTC related to A/T will be sent to ECM.
*3: This sensor is not used to control the engine system under normal conditions.
*4: This switch will operate in place of the throttle position sensor to control EVAP parts if the sensor malfunctions.
EC-17
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System
INPUT/OUTPUT SIGNAL LINE
Engine speed and piston position
Camshaft position sensor
Amount of intake air
Mass air flow sensor
Engine coolant temperature
Engine coolant temperature sensor
Density of oxygen in exhaust gas
Front heated oxygen sensor
Throttle position
Throttle position sensor
Throttle valve idle position
Gear position
Park/neutral position (PNP) switch
Vehicle speed
Vehicle speed sensor
ECM Injector
Start signal
Ignition switch
Air conditioner operation
Air conditioner switch
Engine knocking condition
Knock sensor
Electrical load signal
Electrical load
Battery voltage
Battery
Power steering operation
Power steering oil pressure switch
Density of oxygen in exhaust gas
Rear heated oxygen sensor*
* Under normal conditions, this sensor is not for engine control operation.
BASIC MULTIPORT FUEL INJECTION VARIOUS FUEL INJECTION
SYSTEM INCREASE/DECREASE COMPENSATION
The amount of fuel injected from the fuel injector In addition, the amount of fuel injected is compen-
is determined by the ECM. The ECM controls the sated to improve engine performance under vari-
length of time the valve remains open (injection ous operating conditions as listed below.
pulse duration). The amount of fuel injected is a
program value in the ECM memory. The program q During warm-up
value is preset by engine operating conditions. q When starting the engine
These conditions are determined by input signals q During acceleration
(for engine speed and intake air) from both the q Hot-engine operation
camshaft position sensor and the mass air flow q When selector lever is changed from "N" to
sensor. "D" (A/T models only)
q High-load, high-speed operation
q During deceleration
q During high engine speed operation
EC-18
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System (Cont'd)
MIXTURE RATIO FEEDBACK CONTROL (CLOSED
LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel GI
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 MA
manifold to monitor if the engine operation is rich or lean. The
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