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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 .......................................................... 45
Commercial Service Tools ...................................... 6 Introduction ........................................................... 45
Supplemental Restraint System (SRS) "AIR Two Trip Detection Logic ...................................... 45
CL
BAG" and "SEAT BELT PRE-TENSIONER"........... 8 Emission-related Diagnostic Information .............. 46
Precautions for On Board Diagnostic (OBD) Malfunction Indicator Lamp (MIL) ......................... 60 MT
System of Engine and A/T...................................... 8 OBD System Operation Chart .............................. 60
Engine Fuel & Emission Control System ............... 9 CONSULT-II .......................................................... 66
Precautions ........................................................... 10 Generic Scan Tool (GST) ..................................... 77 AT
ENGINE AND EMISSION CONTROL OVERALL TROUBLE DIAGNOSIS -- Introduction................. 79
SYSTEM.................................................................... 12 Introduction ........................................................... 79
Circuit Diagram ..................................................... 12 Diagnostic Worksheet ........................................... 79 FA
Engine Control Component Parts Location .......... 13 TROUBLE DIAGNOSIS -- Work Flow ................... 81
System Diagram ................................................... 15 Work Flow ............................................................. 81 RA
Vacuum Hose Drawing ......................................... 16 Description for Work Flow .................................... 82
System Chart ........................................................ 17 TROUBLE DIAGNOSIS -- Basic Inspection ......... 83
ENGINE AND EMISSION BASIC CONTROL Basic Inspection.................................................... 83 BR
SYSTEM DESCRIPTION .......................................... 18 TROUBLE DIAGNOSIS -- General Description ... 89
Multiport Fuel Injection (MFI) System................... 18 Diagnostic Trouble Code (DTC) Inspection
Distributor Ignition (DI) System............................. 20 Priority Chart ......................................................... 89 ST
Air Conditioning Cut Control ................................. 21 Fail-Safe Chart...................................................... 90
Fuel Cut Control.................................................... 22 Symptom Matrix Chart .......................................... 91
RS
EVAPORATIVE EMISSION SYSTEM ...................... 23 CONSULT-II Reference Value in Data Monitor
Description ............................................................ 23 Mode ..................................................................... 94
Inspection.............................................................. 23 Major Sensor Reference Graph in Data BT
Evaporative Emission Line Drawing ..................... 26 Monitor Mode ........................................................ 96
On Board Refueling Vapor Recovery (ORVR) ..... 28 ECM Terminals and Reference Value................... 98
POSITIVE CRANKCASE VENTILATION................. 33 TROUBLE DIAGNOSIS -- SPECIFICATION HA
Description ............................................................ 33 VALUE..................................................................... 108
Inspection.............................................................. 33 Description .......................................................... 108
EL
BASIC SERVICE PROCEDURE .............................. 34 Testing Condition ................................................ 108
Fuel Pressure Release ......................................... 34 Inspection Procedure .......................................... 108
Fuel Pressure Check ............................................ 34 Diagnostic Procedure.......................................... 109 IDX
Fuel Pressure Regulator Check ........................... 35 TROUBLE DIAGNOSIS FOR INTERMITTENT
Injector Removal and Installation ......................... 35 INCIDENT................................................................ 112
Fast Idle Cam (FIC) .............................................. 35 Description .......................................................... 112
CONTENTS (Cont'd.)
Common I/I Report Situations ............................ 112 TROUBLE DIAGNOSIS FOR DTC P0180............. 240
Diagnostic Procedure.......................................... 112 Fuel Tank Temperature Sensor........................... 240
TROUBLE DIAGNOSIS FOR POWER SUPPLY... 113 TROUBLE DIAGNOSIS FOR DTC P0300 -
Main Power Supply and Ground Circuit ............. 113 P0304 ...................................................................... 244
TROUBLE DIAGNOSIS FOR DTC P0100............. 118 No. 4 - 1 Cylinder Misfire, Multiple Cylinder
Mass Air Flow Sensor (MAFS) ........................... 118 Misfire.................................................................. 244
TROUBLE DIAGNOSIS FOR DTC P0105............. 127 TROUBLE DIAGNOSIS FOR DTC P0325............. 249
Absolute Pressure Sensor .................................. 127 Knock Sensor (KS) ............................................. 249
TROUBLE DIAGNOSIS FOR DTC P0110 ............. 129 TROUBLE DIAGNOSIS FOR DTC P0335............. 254
Intake Air Temperature Sensor ........................... 129 Crankshaft Position Sensor (CKPS) (OBD) ....... 254
TROUBLE DIAGNOSIS FOR DTC P0115 ............. 134 TROUBLE DIAGNOSIS FOR DTC P0340............. 259
Engine Coolant Temperature Sensor (ECTS) .... 134 Camshaft Position Sensor (CMPS) .................... 259
TROUBLE DIAGNOSIS FOR DTC P0120............. 139 TROUBLE DIAGNOSIS FOR DTC P0400............. 266
Throttle Position Sensor ..................................... 139 EGR Function (Close)......................................... 266
TROUBLE DIAGNOSIS FOR DTC P0125............. 151 TROUBLE DIAGNOSIS FOR DTC P0402............. 275
Engine Coolant Temperature (ECT) Sensor....... 151 EGRC-BPT Valve Function................................. 275
TROUBLE DIAGNOSIS FOR DTC P0130............. 156 TROUBLE DIAGNOSIS FOR DTC P0420............. 280
Heated Oxygen Sensor 1 (Front) (Circuit) ......... 156 Three Way Catalyst Function ............................. 280
TROUBLE DIAGNOSIS FOR DTC P0131............. 163 TROUBLE DIAGNOSIS FOR DTC P0440............. 284
Heated Oxygen Sensor 1 (front) (Lean Shift Evaporative Emission (EVAP) Control System
Monitoring) .......................................................... 163 (Small Leak) (Negative Pressure) ...................... 284
TROUBLE DIAGNOSIS FOR DTC P0132............. 170 TROUBLE DIAGNOSIS FOR DTC P0443............. 293
Heated Oxygen Sensor 1 (Front) (Rich Shift Evaporative Emission (EVAP) Canister Purge
Monitoring) .......................................................... 170 Volume Control Solenoid Valve .......................... 293
TROUBLE DIAGNOSIS FOR DTC P0133............. 178 TROUBLE DIAGNOSIS FOR DTC P0446............. 299
Heated Oxygen Sensor 1 (Front) (Response Evaporative Emission (EVAP) Canister Vent
Monitoring) .......................................................... 178 Control Valve (Circuit)......................................... 299
TROUBLE DIAGNOSIS FOR DTC P0134............. 186 TROUBLE DIAGNOSIS FOR DTC P0450............. 304
Heated Oxygen Sensor 1 (Front) (High Evaporative Emission (EVAP) Control System
Voltage) ............................................................... 186 Pressure Sensor ................................................. 304
TROUBLE DIAGNOSIS FOR DTC P0135............. 192 TROUBLE DIAGNOSIS FOR DTC P0455............. 310
Heated Oxygen Sensor 1 Heater (Front) ........... 192 Evaporative Emission (EVAP) Control System
TROUBLE DIAGNOSIS FOR DTC P0137............. 196 (Large Leak)........................................................ 310
Heated Oxygen Sensor 2 (Rear) (Min. Voltage TROUBLE DIAGNOSIS FOR DTC P0460............. 318
Monitoring) .......................................................... 196 Fuel Level Sensor Function (Slosh) ................... 318
TROUBLE DIAGNOSIS FOR DTC P0138............. 204 TROUBLE DIAGNOSIS FOR DTC P0461............. 321
Heated Oxygen Sensor 2 (Rear) (Max. Fuel Level Sensor Function................................ 321
Voltage Monitoring) ............................................. 204 TROUBLE DIAGNOSIS FOR DTC P0464............. 323
TROUBLE DIAGNOSIS FOR DTC P0139............. 212 Fuel Level Sensor Circuit ................................... 323
Heated Oxygen Sensor 2 (Rear) (Response TROUBLE DIAGNOSIS FOR DTC P0500............. 326
Monitoring) .......................................................... 212 Vehicle Speed Sensor (VSS).............................. 326
TROUBLE DIAGNOSIS FOR DTC P0140............. 219 TROUBLE DIAGNOSIS FOR DTC P0505............. 330
Heated Oxygen Sensor 2 (Rear) (High Idle Air Control Valve (IACV) -- Auxiliary Air
Voltage) ............................................................... 219 Control (AAC) Valve............................................ 330
TROUBLE DIAGNOSIS FOR DTC P0141............. 225 TROUBLE DIAGNOSIS FOR DTC P0510............. 335
Heated Oxygen Sensor 2 Heater (Rear)............ 225 Closed Throttle Position Switch.......................... 335
TROUBLE DIAGNOSIS FOR DTC P0171............. 230 TROUBLE DIAGNOSIS FOR DTC P0600............. 341
Fuel Injection System Function (Lean side) ....... 230 A/T Control.......................................................... 341
TROUBLE DIAGNOSIS FOR DTC P0172............. 235 TROUBLE DIAGNOSIS FOR DTC P0605............. 345
Fuel Injection System Function (Rich side)........ 235 Engine Control Module (ECM)............................ 345
EC-2
CONTENTS (Cont'd.)
TROUBLE DIAGNOSIS FOR DTC P1126 ............. 347 TROUBLE DIAGNOSIS FOR DTC P1448............. 405
Thermostat Function ........................................... 347 Evaporative Emission (EVAP) Canister Vent
GI
TROUBLE DIAGNOSIS FOR DTC P1148 ............. 348 Control Valve (Open) .......................................... 405
Closed Loop Control ........................................... 348 TROUBLE DIAGNOSIS FOR DTC P1464............. 412 MA
TROUBLE DIAGNOSIS FOR DTC P1336............. 351 Fuel Level Sensor Circuit (Ground signal) ......... 412
Crankshaft Position Sensor (CKPS) (OBD) TROUBLE DIAGNOSIS FOR DTC P1490............. 415
(COG).................................................................. 351 Vacuum Cut Valve Bypass Valve (Circuit).......... 415 EM
TROUBLE DIAGNOSIS FOR DTC P1400............. 356 TROUBLE DIAGNOSIS FOR DTC P1491............. 420
EGRC-Solenoid Valve......................................... 356 Vacuum Cut Valve Bypass Valve........................ 420
TROUBLE DIAGNOSIS FOR DTC P1401............. 361 TROUBLE DIAGNOSIS FOR DTC P1605............. 425 LC
EGR Temperature Sensor .................................. 361 A/T Diagnosis Communication Line ................... 425
TROUBLE DIAGNOSIS FOR DTC P1402............. 367 TROUBLE DIAGNOSIS FOR DTC P1706............. 428
EC
EGR Function (Open) ......................................... 367 Park/Neutral Position (PNP) Switch ................... 428
TROUBLE DIAGNOSIS FOR DTC P1440............. 374 TROUBLE DIAGNOSIS FOR OVERHEAT ............ 433
Evaporative Emission (EVAP) Control System Overheat ............................................................. 433 FE
(Small Leak) (Positive Pressure) ........................ 374 TROUBLE DIAGNOSIS FOR
TROUBLE DIAGNOSIS FOR DTC P1441............. 376 NON-DETECTABLE ITEMS ................................... 445
Evaporative Emission (EVAP) Control System Ignition Signal ..................................................... 445 CL
(Very Small Leak) ............................................... 376 Injector ................................................................ 451
TROUBLE DIAGNOSIS FOR DTC P1444............. 386 Start Signal ......................................................... 454
MT
Evaporative Emission (EVAP) Canister Purge Fuel Pump........................................................... 457
Volume Control Solenoid Valve .......................... 386 Power Steering Oil Pressure Switch .................. 463
TROUBLE DIAGNOSIS FOR DTC P1446............. 393 IACV-FICD Solenoid Valve ................................. 467 AT
Evaporative Emission (EVAP) Canister Vent Electric Load Signal ............................................ 471
Control Valve (Close).......................................... 393 MIL & Data Link Connectors............................... 474
TROUBLE DIAGNOSIS FOR DTC P1447............. 398 SERVICE DATA AND SPECIFICATIONS (SDS) ... 475 FA
Evaporative Emission (EVAP) Control System General Specifications ........................................ 475
Purge Flow Monitoring........................................ 398 Inspection and Adjustment.................................. 475
RA
When you read wiring diagrams:
b Read GI section, ``HOW TO READ WIRING DIAGRAMS''.
b Read EL section, ``POWER SUPPLY ROUTING'' for power distribution circuit. BR
When you perform trouble diagnoses, read GI section, ``HOW TO FOLLOW FLOW CHART IN
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*4 DTC*4
Items Items
CONSULT-II Reference page CONSULT-II Reference page
(CONSULT-II screen terms) (CONSULT-II screen terms)
GST*1 GST*1
Unable to access ECM -- EC-90 HO2S1 (B1) P0130 EC-156
*COOLAN T SEN/CIRC P0125 EC-151 HO2S1 (B1) P0133 EC-178
A/T 1ST GR FNCTN P0731 AT-95 HO2S1 (B1) P0132 EC-170
A/T 2ND GR FNCTN P0732 AT-101 HO2S1 (B1) P0131 EC-163
A/T 3RD GR FNCTN P0733 AT-107 HO2S1 (B1) P0134 EC-186
A/T 4TH GR FNCTN P0734 AT-113 HO2S1 HTR (B1) P0135 EC-192
A/T COMM LINE P0600 EC-341 HO2S2 (B1) P0138 EC-204
A/T DIAG COMM LINE P1605 EC-425 HO2S2 (B1) P0137 EC-196
A/T TCC S/V FNCTN P0744 AT-125 HO2S2 (B1) P0140 EC-219
ABSL PRES SEN/CIRC P0105 EC-127 HO2S2 (B1) P0139 EC-212
AIR TEMP SEN/CIRC P0110 EC-129 HO2S2 HTR (B1) P0141 EC-225
ATF TEMP SEN/CIRC P0710 AT-83 IACV/AAC VLV/CIRC P0505 EC-330
CMP SEN/CIRCUIT P0340 EC-259 KNOCK SEN/CIRC-B1 P0325 EC-249
CLOSED LOOP-B1 P1148 EC-348 L/PRESS SOL/CIRC P0745 AT-133
CLOSED TP SW/CIRC P0510 EC-335 MAF SEN/CIRCUIT*2 P0100 EC-118
COOLANT T SEN/CIRC P0115 EC-134 MULTI CYL MISFIRE P0300 EC-244
CKP SENSOR (COG) P1336 EC-351 EC-59 or
NATS MALFUNC --
CKP SEN/CIRCUIT P0335 EC-254 EL-257
CYL 1 MISFIRE P0301 EC-244 NO DTC IS DETECTED. FUR-
THER TESTING MAY BE P0000 --
CYL 2 MISFIRE P0302 EC-244 REQUIRED.
CYL 3 MISFIRE P0303 EC-244 O/R CLTCH SOL/CIRC P1760 AT-154
CYL 4 MISFIRE P0304 EC-244 OVERHEAT -- EC-433
ECM P0605 EC-345 P-N POS SW/CIRCUIT P1706 EC-428
EGR SYSTEM P0400 EC-266 PNP SW/CIRC P0705 AT-78
EGR SYSTEM P1402 EC-367 PURG VOLUME CONT/V P1444 EC-386
EGR TEMP SEN/CIRC P1401 EC-361 PURG VOLUME CONT/V P0443 EC-293
EGRC SOLENOID/V P1400 EC-356 SFT SOL A/CIRC*2 P0750 AT-138
EGRC-BPT VALVE P0402 EC-275 SFT SOL B/CIRC*2 P0755 AT-143
ENGINE SPEED SIG P0725 AT-92 TCC SOLENOID/CIRC P0740 AT-120
EVAP PURG FLOW/MON P1447 EC-398 THERMSTAT FNCTN P1126 EC-347
EVAP SMALL LEAK P0440 EC-284 THRTL POS SEN/CIRC*2 P0120 EC-139
EVAPO SYS PRES SEN P0450 EC-304 TP SEN/CIRC A/T*2 P1705 AT-148
EVAP GROSS LEAK P0455 EC-310 TW CATALYST SYS-B1 P0420 EC-280
EVAP SMALL LEAK P1440 EC-374 VC CUT/V BYPASS/V P1491 EC-420
EVAP VERY SML LEAK P1441 EC-376 VC/V BYPASS/V P1490 EC-415
FUEL LEVL SEN/CIRC P0464 EC-323 VEH SPD SEN/CIR AT*3 P0720 AT-88
FUEL LEV SEN SLOSH P0460 EC-318 VEH SPEED SEN/CIRC*3 P0500 EC-326
FUEL LEVEL SENSOR P0461 EC-321 VENT CONTROL VALVE P1446 EC-393
FUEL LEVL SEN/CIRC P1464 EC-412 VENT CONTROL VALVE P1448 EC-405
FUEL SYS-LEAN BK1 P0171 EC-230 VENT CONTROL VALVE P0446 EC-299
FUEL SYS-RICH BK1 P0172 EC-235
*1: These numbers are prescribed by SAE J2012.
FUEL TEMP SEN/CIRC P0180 EC-240 *2: When the fail-safe operation occurs, the MIL illumi-
nates.
*3: The MIL illuminates when both the "Revolution sensor
signal" and the "Vehicle speed sensor" meet the fail-
safe condition at the same time.
*4: 1st trip DTC No. is the same as DTC No.
EC-4
DIAGNOSTIC TROUBLE CODE INDEX
Alphabetical & P No. Index for DTC (Cont'd)
P NO. INDEX FOR DTC
DTC*4 DTC*4
Items Items
CONSULT-II (CONSULT-II screen terms)
Reference page CONSULT-II (CONSULT-II screen terms)
Reference page GI
GST*1 GST*1
-- Unable to access ECM EC-90 P0510 CLOSED TP SW/CIRC EC-335
-- NATS MALFUNC
EC-59 or EL P0600 A/T COMM LINE EC-341 MA
section P0605 ECM EC-345
NO DTC IS DETECTED. FUR- P0705 PNP SW/CIRC AT-78
P0000 THER TESTING MAY BE -- EM
REQUIRED. P0710 ATF TEMP SEN/CIRC AT-83
P0100 MAF SEN/CIRCUIT*2 EC-118 P0720 VEH SPD SEN/CIR AT*3 AT-88
P0725 ENGINE SPEED SIG AT-92
P0105 ABSL PRES SEN/CIRC EC-127 LC
P0110 AIR TEMP SEN/CIRC EC-129 P0731 A/T 1ST GR FNCTN AT-95
P0115 COOLANT T SEN/CIRC EC-134 P0732 A/T 2ND GR FNCTN AT-101
P0120 THRTL POS SEN/CIRC*2 EC-139 P0733 A/T 3RD GR FNCTN AT-107 EC
P0125 *COOLAN T SEN/CIRC EC-151 P0734 A/T 4TH GR FNCTN AT-113
P0130 HO2S1 (B1) EC-156 P0740 TCC SOLENOID/CIRC AT-120
P0131 HO2S1 (B1) EC-163 P0744 A/T TCC S/V FNCTN AT-125 FE
P0132 HO2S1 (B1) EC-170 P0745 L/PRESS SOL/CIRC AT-133
P0133 HO2S1 (B1) EC-178 P0750 SFT SOL A/CIRC*2 AT-138
CL
P0134 HO2S1 (B1) EC-186 P0755 SFT SOL B/CIRC*2 AT-143
P0135 HO2S1 HTR (B1) EC-192 P1126 THERMSTAT FNCTN EC-347
P0137 HO2S2 (B1) EC-196 P1148 CLOSED LOOP-B1 EC-348 MT
P0138 HO2S2 (B1) EC-204 P1336 CKP SENSOR (COG) EC-351
P0139 HO2S2 (B1) EC-212 P1400 EGRC SOLENOID/V EC-356
P0140 HO2S2 (B1) EC-219 P1401 EGR TEMP SEN/CIRC EC-361 AT
P0141 HO2S2 HTR (B1) EC-225 P1402 EGR SYSTEM EC-367
P0171 FUEL SYS-LEAN/BK1 EC-230 P1440 EVAP SMALL LEAK EC-374
P1441 EVAP VERY SML LEAK EC-376
FA
P0172 FUEL SYS-RICH/BK1 EC-235
P0180 FUEL TEMP SEN/CIRC EC-240 P1444 PURG VOLUME CONT/V EC-386
P1446 VENT CONTROL VALVE EC-393
P0300 MULTI CYL MISFIRE EC-244 RA
P0301 CYL 1 MISFIRE EC-244 P1464 FUEL LEVL SEN/CIRC EC-412
P0302 CYL 2 MISFIRE EC-244 P1447 EVAP PURG FLOW/MON EC-398
P0303 CYL 3 MISFIRE EC-244 P1448 VENT CONTROL VALVE EC-405 BR
P0304 CYL 4 MISFIRE EC-244 P1490 VC/V BYPASS/V EC-415
P0325 KNOSK SEN/CIRC-B1 EC-249 P1491 VC CUT/V BYPASS/V EC-420
P1605 A/T DIAG COMM LINE EC-425
ST
P0335 CKP SEN/CIRCUIT EC-254
P0340 CMP SEN/CIRCUIT EC-259 P1705 TP SEN/CIRC A/T*2 AT-148
P1706 P-N POS SW/CIRCUIT EC-428
P0400 EGR SYSTEM EC-266 RS
P0402 EGRC-BPT VALVE EC-275 P1760 O/R CLTCH SOL/CIRC AT-154
P0420 TW CATALYST SYS-B1 EC-280 -- OVERHEAT EC-433
P0440 EVAP SMALL LEAK EC-284 *1: These numbers are prescribed by SAE J2012. BT
P0443 PURG VOLUME CONT/V EC-293 *2: When the fail-safe operation occurs, the MIL illumi-
nates.
P0446 VENT CONTROL VALVE EC-299
*3: The MIL illuminates when both the "Revolution sensor HA
P0450 EVAPO SYS PRES SEN EC-304 signal" and the "Vehicle speed sensor" meet the fail-
P0455 EVAP GROSS LEAK EC-310 safe condition at the same time.
P0460 FUEL LEV SEN SLOSH EC-318
*4: 1st trip DTC No. is the same as DTC No.
EL
P0461 FUEL LEVEL SENSOR EC-321
P0464 FUEL LEVL SEN/CIRC EC-323
P0500 VEH SPEED SEN/CIRC*3 EC-326 IDX
P0505 IACV/AAC VLV/CIRC EC-330
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-45356) Checking fuel tank vacuum relief valve open-
Fuel filler cap adapter ing pressure
NT815
Commercial Service Tools
Tool name Description
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):
b 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.
b 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:
b 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.
b 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.
b 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:
b 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.
b 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.)
b 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").
b 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.
b 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.
b 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
b 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
b 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
b 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
b Before replacing ECM, perform Terminals and Refer-
ence Value inspection and make sure ECM functions
properly. Refer to EC-98.
MEF040D
b 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)
b 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.
b Do not use ECM ground terminals when measuring
input/output voltage. Doing so may result in damage to MA
the ECM's power transistor. Use a ground other than
ECM terminals, such as an engine ground.
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
WEC121A
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
SEF739Z
EC-13
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location
(Cont'd)
SEF469UA SEF468UA
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
SEF849Z
EC-15
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Vacuum Hose Drawing
SEF729Z
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
Heated oxygen sensor 1 (front)
EM
Ignition switch Idle air control system IACV-AAC valve and LC
IACV-FICD solenoid valve
Throttle position sensor
EC
*4
Fuel pump control Fuel pump relay
Closed throttle position switch
FE
Park/neutral position (PNP) switch
Malfunction indicator lamp
Air conditioner switch
On board diagnostic system (On the instrument panel) CL
Knock sensor
MT
EGR control EGRC-solenoid valve
Intake air temperature sensor
AT
*1
ECM
b EGR temperature sensor
b EVAP control system pressure Heated oxygen sensor 1 heater Heated oxygen sensor 1 heater
sensor (front) control (front) FA
b Fuel level sensor
Battery voltage RA
Heated oxygen sensor 2 heater Heated oxygen sensor 2 heater
Power steering oil pressure switch (rear) control (rear)
BR
Vehicle speed sensor
*1 EVAP canister purge flow con- EVAP canister purge volume ST
trol control solenoid valve
Fuel tank temperature sensor
*1 RS
Crankshaft position sensor (OBD)
Air conditioning cut control Air conditioner relay
*3 BT
Heated oxygen sensor 2 (rear)
*2 b EVAP canister vent control HA
TCM (Transmission control module) valve
b Vacuum cut valve bypass
valve
Electrical load EL
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
Heated oxygen sensor 1 (front)
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
Heated oxygen sensor 2 (rear)*
* 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 b During warm-up
value is preset by engine operating conditions. b When starting the engine
These conditions are determined by input signals b During acceleration
(for engine speed and intake air) from both the b Hot-engine operation
camshaft position sensor and the mass air flow b When selector lever is changed from "N" to
sensor. "D" (A/T models only)
b High-load, high-speed operation
b During deceleration
b 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 heated oxygen sensor 1 (front) in the MA
exhaust manifold to monitor if the engine operation is rich or
lean. The ECM adjusts the injection pulse width according to the
sensor voltage signal. For more information about the heated EM
oxygen sensor 1 (front), refer to EC-156, 163. This maintains
SEF973Z
the mixture ratio within the range of stoichiometric (ideal air-fuel
mixture). LC
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 (rear) is located downstream of the
three way catalyst. Even if the switching characteristics of the EC
heated oxygen sensor 1 (front) shift, the air-fuel ratio is con-
trolled to stoichiometric by the signal from the heated oxygen
sensor 2 (rear). FE
OPEN LOOP CONTROL
The open loop system condition refers to when the ECM detects CL
any of the following conditions. Feedback control stops in order
to maintain stabilized fuel combustion.
b Deceleration and acceleration MT
b High-load, high-speed operation
b Malfunction of heated oxygen sensor 1 (front) or its circuit
b Insufficient activation of heated oxygen sensor 1 (front) at AT
low engine coolant temperature
b High engine coolant temperature
b During warm-up FA
b When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL RA
The mixture ratio feedback control system monitors the mixture
ratio signal transmitted from the heated oxygen sensor 1 (front).
This feedback signal is then sent to the ECM. The ECM controls BR
the basic mixture ratio as close to the theoretical mixture ratio as
possible. However, the basic mixture ratio is not necessarily con-
trolled as originally designed. Both manufacturing differences ST
(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 RS
mixture ratios is monitored in this system. This is then computed
in terms of "injection pulse duration" to automatically compen-
sate for the difference between the two ratios. BT
"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. HA
"Short term fuel trim" is the short-term fuel compensation used
to maintain the mixture ratio at its theoretical value. The signal
from the heated oxygen sensor 1 (front) indicates whether the EL
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. IDX
"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 an ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo