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ENGINE CONTROL SYSTEM GI
SECTION EC MA
EM
LC
EC
CONTENTS
FE
DIAGNOSTIC TROUBLE CODE INDEX.........................4 ON BOARD DIAGNOSTIC SYSTEM
Alphabetical & P No. Index for DTC ...........................4 DESCRIPTION ...............................................................38
PRECAUTIONS AND PREPARATION............................6 Introduction ................................................................38 CL
Special Service Tools ..................................................6 Two Trip Detection Logic ...........................................38
Commercial Service Tools ...........................................6 Emission-related Diagnostic Information ...................39
Supplemental Restraint System (SRS) Malfunction Indicator Lamp (MIL)..............................49 MT
``AIR BAG'' ...................................................................8 OBD System Operation Chart ...................................52
Precautions for On Board Diagnostic (OBD) CONSULT ..................................................................57
System of Engine ........................................................8 Generic Scan Tool (GST) ..........................................68 AT
Engine Fuel & Emission Control System ....................9 TROUBLE DIAGNOSIS -- Introduction......................70
Precautions ................................................................10 Introduction ................................................................70
ENGINE AND EMISSION CONTROL OVERALL Diagnostic Worksheet................................................70
TF
SYSTEM.........................................................................12 TROUBLE DIAGNOSIS -- Work Flow ........................72
Circuit Diagram ..........................................................12 Work Flow..................................................................72 PD
Engine Control Component Parts Location...............13 Description for Work Flow .........................................73
System Diagram ........................................................15 TROUBLE DIAGNOSIS -- Basic Inspection ..............74
Vacuum Hose Drawing ..............................................16 Basic Inspection.........................................................74 FA
System Chart .............................................................17 TROUBLE DIAGNOSIS -- General Description ........80
ENGINE AND EMISSION BASIC CONTROL Diagnostic Trouble Code (DTC) Inspection
SYSTEM DESCRIPTION ...............................................18 Priority Chart..............................................................80 RA
Multiport Fuel Injection (MFI) System .......................18 Fail-Safe Chart...........................................................81
Distributor Ignition (DI) System .................................20 Symptom Matrix Chart...............................................82
Air Conditioning Cut Control......................................21 CONSULT Reference Value in Data Monitor BR
Fuel Cut Control ........................................................22 Mode ..........................................................................85
EVAPORATIVE EMISSION SYSTEM ...........................23 Major Sensor Reference Graph in Data Monitor
Description .................................................................23 Mode ..........................................................................87
ST
Inspection...................................................................23 ECM Terminals and Reference Value .......................89
Evaporative Emission Line Drawing..........................26 TROUBLE DIAGNOSIS FOR INTERMITTENT RS
POSITIVE CRANKCASE VENTILATION......................28 INCIDENT.......................................................................98
Description .................................................................28 Description .................................................................98
Inspection...................................................................28 Common I/I Report Situations ...................................98 BT
BASIC SERVICE PROCEDURE ...................................29 Diagnostic Procedure ................................................98
Fuel Pressure Release ..............................................29 TROUBLE DIAGNOSIS FOR POWER SUPPLY..........99
Fuel Pressure Check .................................................29 Main Power Supply and Ground Circuit....................99 HA
Fuel Pressure Regulator Check ................................29 TROUBLE DIAGNOSIS FOR DTC P0100..................104
Injector Removal and Installation ..............................30 Mass Air Flow Sensor (MAFS) ................................104
Fast Idle Cam (FIC)...................................................31 TROUBLE DIAGNOSIS FOR DTC P0105..................113 EL
Idle Speed/Ignition Timing/Idle Mixture Ratio Absolute Pressure Sensor.......................................113
Adjustment .................................................................32 TROUBLE DIAGNOSIS FOR DTC P0110 ..................120
Intake Air Temperature Sensor................................120
IDX
CONTENTS (Cont'd.)
TROUBLE DIAGNOSIS FOR DTC P0115 ..................126 Camshaft Position Sensor (CMPS) .........................252
Engine Coolant Temperature Sensor (ECTS) TROUBLE DIAGNOSIS FOR DTC P0400..................258
(Circuit) ....................................................................126 EGR Function (Close) .............................................258
TROUBLE DIAGNOSIS FOR DTC P0120..................131 TROUBLE DIAGNOSIS FOR DTC P0402..................266
Throttle Position Sensor ..........................................131 EGRC-BPT Valve Function .....................................266
TROUBLE DIAGNOSIS FOR DTC P0125..................145 TROUBLE DIAGNOSIS FOR DTC P0420..................271
Engine Coolant Temperature (ECT) Sensor ...........145 Three Way Catalyst Function ..................................271
TROUBLE DIAGNOSIS FOR DTC P0130..................150 TROUBLE DIAGNOSIS FOR DTC P0440..................276
Front Heated Oxygen Sensor (Circuit) (Front Evaporative Emission (EVAP) Control System
HO2S) ......................................................................150 (Small Leak) (Negative Pressure) ...........................276
TROUBLE DIAGNOSIS FOR DTC P0131..................157 TROUBLE DIAGNOSIS FOR DTC P0443..................286
Front Heated Oxygen Sensor (Lean Shift Evaporative Emission (EVAP) Canister Purge
Monitoring) (Front HO2S) ........................................157 Volume Control Solenoid Valve (Circuit) .................286
TROUBLE DIAGNOSIS FOR DTC P0132..................164 TROUBLE DIAGNOSIS FOR DTC P0446..................292
Front Heated Oxygen Sensor (Rich Shift Evaporative Emission (EVAP) Canister Vent
Monitoring) (Front HO2S) ........................................164 Control Valve (Circuit)..............................................292
TROUBLE DIAGNOSIS FOR DTC P0133..................171 TROUBLE DIAGNOSIS FOR DTC P0450..................297
Front Heated Oxygen Sensor (Response Evaporative Emission (EVAP) Control System
Monitoring) (Front HO2S) ........................................171 Pressure Sensor ......................................................297
TROUBLE DIAGNOSIS FOR DTC P0134..................179 TROUBLE DIAGNOSIS FOR DTC P0500..................303
Front Heated Oxygen Sensor (High Voltage) Vehicle Speed Sensor (VSS) ..................................303
(Front HO2S) ...........................................................179 TROUBLE DIAGNOSIS FOR DTC P0505..................308
TROUBLE DIAGNOSIS FOR DTC P0135..................186 Idle Air Control Valve (IACV) -- Auxiliary Air
Front Heated Oxygen Sensor Heater......................186 Control (AAC) Valve ................................................308
TROUBLE DIAGNOSIS FOR DTC P0137..................190 TROUBLE DIAGNOSIS FOR DTC P0510..................314
Rear Heated Oxygen Sensor (Min. Voltage Closed Throttle Position Switch...............................314
Monitoring) (Rear HO2S).........................................190 TROUBLE DIAGNOSIS FOR DTC P0605..................320
TROUBLE DIAGNOSIS FOR DTC P0138..................198 Engine Control Module (ECM) ................................320
Rear Heated Oxygen Sensor (Max. Voltage TROUBLE DIAGNOSIS FOR DTC P1105 ..................322
Monitoring) (Rear HO2S).........................................198 Manifold Absolute Pressure (MAP)/
TROUBLE DIAGNOSIS FOR DTC P0139..................206 Barometric Pressure (BARO) Switch Solenoid
Rear Heated Oxygen Sensor (Response Valve ........................................................................322
Monitoring) (Rear HO2S).........................................206 TROUBLE DIAGNOSIS FOR DTC P1148 ..................331
TROUBLE DIAGNOSIS FOR DTC P0140..................214 Closed Loop Control................................................331
Rear Heated Oxygen Sensor (High Voltage) TROUBLE DIAGNOSIS FOR DTC P1320..................333
(Rear HO2S)............................................................214 Ignition Signal ..........................................................333
TROUBLE DIAGNOSIS FOR DTC P0141..................220 TROUBLE DIAGNOSIS FOR DTC P1336..................340
Rear Heated Oxygen Sensor Heater ......................220 Crankshaft Position Sensor (CKPS) (OBD)
TROUBLE DIAGNOSIS FOR DTC P0171..................224 (COG) ......................................................................340
Fuel Injection System Function (Lean side)............224 TROUBLE DIAGNOSIS FOR DTC P1400..................345
TROUBLE DIAGNOSIS FOR DTC P0172..................229 EGRC-Solenoid Valve .............................................345
Fuel Injection System Function (Rich side).............229 TROUBLE DIAGNOSIS FOR DTC P1401..................350
TROUBLE DIAGNOSIS FOR DTC P0180..................234 EGR Temperature Sensor .......................................350
Tank Fuel Temperature Sensor ...............................234 TROUBLE DIAGNOSIS FOR DTC P1402..................356
TROUBLE DIAGNOSIS FOR DTC P0300 - P0304....238 EGR Function (Open)..............................................356
No. 4 - 1 Cylinder Misfire, Multiple Cylinder TROUBLE DIAGNOSIS FOR DTC P1440..................363
Misfire ......................................................................238 Evaporative Emission (EVAP) Control System
TROUBLE DIAGNOSIS FOR DTC P0325..................243 (Small Leak) (Positive Pressure).............................363
Knock Sensor (KS) ..................................................243 TROUBLE DIAGNOSIS FOR DTC P1444..................373
TROUBLE DIAGNOSIS FOR DTC P0335..................247 Evaporative Emission (EVAP) Canister Purge
Crankshaft Position Sensor (CKPS) (OBD) ............247 Volume Control Solenoid Valve ...............................373
TROUBLE DIAGNOSIS FOR DTC P0340..................252 TROUBLE DIAGNOSIS FOR DTC P1446..................381
EC-2
CONTENTS (Cont'd.) GI
Evaporative Emission (EVAP) Canister Vent TROUBLE DIAGNOSIS FOR DTC P1776..................416
Control Valve (Close)...............................................381 Torque Converter Clutch Solenoid Valve ................416 MA
TROUBLE DIAGNOSIS FOR DTC P1447..................386 TROUBLE DIAGNOSIS FOR OVERHEAT .................420
Evaporative Emission (EVAP) Control System Overheat ..................................................................420
Purge Flow Monitoring.............................................386 TROUBLE DIAGNOSIS FOR NON-DETECTABLE EM
TROUBLE DIAGNOSIS FOR DTC P1448..................392 ITEMS...........................................................................423
Evaporative Emission (EVAP) Canister Vent Injector .....................................................................423
LC
Control Valve (Open) ...............................................392 Start Signal ..............................................................426
TROUBLE DIAGNOSIS FOR DTC P1490..................397 Fuel Pump ...............................................................429
Vacuum Cut Valve Bypass Valve (Circuit)...............397 Power Steering Oil Pressure Switch .......................434 EC
TROUBLE DIAGNOSIS FOR DTC P1491..................402 IACV-FICD Solenoid Valve ......................................437
Vacuum Cut Valve Bypass Valve ............................402 MIL & Data Link Connectors ...................................441
TROUBLE DIAGNOSIS FOR DTC P1706..................407 SERVICE DATA AND SPECIFICATIONS (SDS) ........442 FE
Park/Neutral Position (PNP) Switch ........................407 General Specifications.............................................442
TROUBLE DIAGNOSIS FOR DTC P1775..................412 Inspection and Adjustment ......................................442
Torque Converter Clutch Solenoid Valve (Circuit)...412 CL
When you read wiring diagrams:
q Read GI section, ``HOW TO READ WIRING DIAGRAMS''. MT
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
TROUBLE DIAGNOSES'' and ``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL AT
INCIDENT''.
TF
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
EC-3
DIAGNOSTIC TROUBLE CODE INDEX
Alphabetical & P No. Index for DTC
ALPHABETICAL INDEX FOR DTC
DTC*5 DTC*5
Items Reference Items Reference
(CONSULT screen terms) CONSULT page (CONSULT screen terms) CONSULT page
ECM*1 ECM*1
GST*2 GST*2
Unable to access ECM -- -- EC-81 IGN SIGNAL-PRIMARY P1320 0201 EC-333
*COOLAN T SEN/CIRC P0125 0908 EC-145 KNOCK SEN/CIRCUIT P0325 0304 EC-243
ABSL PRES SEN/CIRC P0105 0803 EC-113 MAF SEN/CIRCUIT*3 P0100 0102 EC-104
AIR TEMP SEN/CIRC P0110 0401 EC-120 MAP/BAR SW SOL/CIR P1105 1302 EC-322
CAM POS SEN/CIR P0340 0101 EC-252 MULTI CYL MISFIRE P0300 0701 EC-238
CLOSED LOOP P1148 0307 EC-331 NO SELF DIAGNOSTIC
P0000 0505 --
CLOSED TP SW/CIRC P0510 0203 EC-314 FAILURE INDICATED
COOLANT T SEN/CIRC P0115 0103 EC-126 NO SELF DIAGNOSTIC Flash-
No DTC EC-49
FAILURE INDICATED ing*4
CPS/CIRC (OBD) COG P1336 0905 EC-340
OVERHEAT -- 0208 EC-420
CPS/CIRCUIT (OBD) P0335 0802 EC-247
P-N POS SW/CIRCUIT P1706 1003 EC-407
CYL 1 MISFIRE P0301 0608 EC-238
PURG VOLUME CONT/V P1444 0214 EC-373
CYL 2 MISFIRE P0302 0607 EC-238
PURG VOLUME CONT/V P0443 1008 EC-286
CYL 3 MISFIRE P0303 0606 EC-238
REAR O2 SENSOR P0138 0510 EC-198
CYL 4 MISFIRE P0304 0605 EC-238
REAR O2 SENSOR P0137 0511 EC-190
ECM P0605 0301 EC-320
REAR O2 SENSOR P0140 0512 EC-214
EGR SYSTEM P0400 0302 EC-258
REAR O2 SENSOR P0139 0707 EC-206
EGR SYSTEM P1402 0514 EC-356
RR O2 SEN HEATER P0141 0902 EC-220
EGR TEMP SEN/CIRC P1401 0305 EC-350
THRTL POS SEN/CIRC*3 P0120 0403 EC-131
EGRC SOLENOID/V P1400 1005 EC-345
TOR CONV CLTCH S/V P1775 0904 EC-412
EGRC-BPT VALVE P0402 0306 EC-266
TOR CONV CLTCH S/V P1776 0513 EC-416
EVAP PURG FLOW/MON P1447 0111 EC-386
TW CATALYST SYSTEM P0420 0702 EC-271
EVAP SMALL LEAK P1440 0213 EC-363
VC CUT/V BYPASS/V P1491 0311 EC-402
EVAP SMALL LEAK P0440 0705 EC-276
VC/V BYPASS/V P1490 0801 EC-397
EVAPO SYS PRES SEN P0450 0704 EC-297
VEH SPEED SEN/CIRC P0500 0104 EC-303
FRONT O2 SENSOR P0130 0303 EC-150
VENT CONTROL VALVE P1446 0215 EC-381
FR O2 SEN HEATER P0135 0901 EC-186
VENT CONTROL VALVE P1448 0309 EC-392
FRONT O2 SENSOR P0133 0409 EC-171
VENT CONTROL VALVE P0446 0903 EC-292
FRONT O2 SENSOR P0132 0410 EC-164
FRONT O2 SENSOR P0131 0411 EC-157
*1: In Diagnostic Test Mode II (Self-diagnostic results). These
numbers are controlled by NISSAN.
FRONT O2 SENSOR P0134 0412 EC-179 *2: These numbers are prescribed by SAE J2012.
FUEL SYS DIAG-LEAN P0171 0115 EC-224 *3: When the fail-safe operation occurs, the MIL illuminates.
*4: While engine is running.
FUEL SYS DIAG-RICH P0172 0114 EC-229
*5: 1st trip DTC No. is the same as DTC No.
FUEL TEMP SEN/CIRC P0180 0402 EC-234
IACV/AAC VLV/CIRC P0505 0205 EC-308
EC-4
DIAGNOSTIC TROUBLE CODE INDEX
Alphabetical & P No. Index for DTC (Cont'd)
P NO. INDEX FOR DTC GI
DTC*5 DTC*5
Items Reference Items Reference
CONSULT
ECM*1 (CONSULT screen terms) page CONSULT
ECM*1 (CONSULT screen terms) page MA
GST*2 GST*2
-- -- Unable to access ECM EC-81 P0402 0306 EGRC-BPT VALVE EC-266
No DTC
Flash- NO SELF DIAGNOSTIC
EC-49
P0420 0702 TW CATALYST SYSTEM EC-271 EM
ing*4 FAILURE INDICATED P0440 0705 EVAP SMALL LEAK EC-276
NO SELF DIAGNOSTIC P0443 1008 PURG VOLUME CONT/V EC-286
P0000 0505 --
FAILURE INDICATED
P0446 0903 VENT CONTROL VALVE EC-292 LC
P0100 0102 MAF SEN/CIRCUIT*3 EC-104
P0450 0704 EVAPO SYS PRES SEN EC-297
P0105 0803 ABSL PRES SEN/CIRC EC-113
P0500 0104 VEH SPEED SEN/CIRC EC-303
P0110 0401 AIR TEMP SEN/CIRC EC-120
P0505 0205 IACV/AAC VLV/CIRC EC-308
EC
P0115 0103 COOLANT T SEN/CIRC EC-126
P0510 0203 CLOSED TP SW/CIRC EC-314
P0120 0403 THRTL POS SEN/CIRC*3 EC-131
P0605 0301 ECM EC-320
P0125 0908 *COOLAN T SEN/CIRC EC-145 FE
P1105 1302 MAP/BAR SW SOL/CIR EC-322
P0130 0303 FRONT O2 SENSOR EC-150
P1148 0307 CLOSED LOOP EC-331
P0131 0411 FRONT O2 SENSOR EC-157
P1320 0201 IGN SIGNAL-PRIMARY EC-333 CL
P0132 0410 FRONT O2 SENSOR EC-164
P1336 0905 CPS/CIRC (OBD) COG EC-340
P0133 0409 FRONT O2 SENSOR EC-171
P1400 1005 EGRC SOLENOID/V EC-345
P0134 0412 FRONT O2 SENSOR EC-179
P1401 0305 EGR TEMP SEN/CIRC EC-350
MT
P0135 0901 FR O2 SEN HEATER EC-186
P1402 0514 EGR SYSTEM EC-356
P0137 0511 REAR O2 SENSOR EC-190
P1440 0213 EVAP SMALL LEAK EC-363
P0138 0510 REAR O2 SENSOR EC-198 AT
P1444 0214 PURG VOLUME CONT/V EC-373
P0139 0707 REAR O2 SENSOR EC-206
P1446 0215 VENT CONTROL VALVE EC-381
P0140 0512 REAR O2 SENSOR EC-214
P0141 0902 RR O2 SEN HEATER EC-220
P1447 0111 EVAP PURG FLOW/MON EC-386 TF
P1448 0309 VENT CONTROL VALVE EC-392
P0171 0115 FUEL SYS DIAG-LEAN EC-224
P1490 0801 VC/V BYPASS/V EC-397
P0172 0114 FUEL SYS DIAG-RICH EC-229
P1491 0311 VC CUT/V BYPASS/V EC-402 PD
P0180 0402 FUEL TEMP SEN/CIRC EC-234
P1706 1003 P-N POS SW/CIRCUIT EC-407
P0300 0701 MULTI CYL MISFIRE EC-238
P1775 0904 TOR CONV CLTCH S/V EC-412
P0301 0608 CYL 1 MISFIRE EC-238 FA
P1776 0513 TOR CONV CLTCH S/V EC-416
P0302 0607 CYL 2 MISFIRE EC-238
-- 0208 OVERHEAT EC-420
P0303 0606 CYL 3 MISFIRE EC-238
P0304 0605 CYL 4 MISFIRE EC-238 *1: In Diagnostic Test Mode II (Self-diagnostic results). These RA
numbers are controlled by NISSAN.
P0325 0304 KNOCK SEN/CIRCUIT EC-243 *2: These numbers are prescribed by SAE J2012.
P0335 0802 CPS/CIRCUIT (OBD) EC-247 *3: When the fail-safe operation occurs, the MIL illuminates.
*4: While engine is running. BR
P0340 0101 CAM POS SEN/CIR EC-252
*5: 1st trip DTC No. is the same as DTC No.
P0400 0302 EGR SYSTEM EC-258
ST
RS
BT
HA
EL
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)
Commercial Service Tools
Tool name Description
Fuel filler cap adapter Checking fuel tank vacuum relief valve open-
ing pressure
NT653
Leak detector Locating the EVAP leak
(J41416)
NT703
EVAP service port adapter Applying positive pressure through EVAP ser-
(J41413-OBD) vice port
NT704
Hose clipper Clamping the EVAP purge hose between the
( -- ) fuel tank and EVAP canister applied to DTC
P1440 [EVAP control system (Small leak --
Positive pressure)]
NT720
EC-6
PRECAUTIONS AND PREPARATION
Commercial Service Tools (Cont'd)
GI
Oxygen sensor thread Reconditioning the exhaust system threads
cleaner before installing a new oxygen sensor. Use
(J-43897-18) with anti-seize lubricant shown in Commercial
MA
(J-43897-12) Service Tools.
EM
a: J-43897-18-18mm diameter, for Zirconia Oxy-
gen Sensor
b: J-43897-12-12mm diameter, for Titania Oxy- LC
AEM488 gen Sensor
Anti-seize lubricant (Perma- Lubricating oxygen sensor thread cleaning
texTM 133 AR or equivalent tool when reconditioning exhaust system EC
meeting MIL specification threads.
MIL-A-907)
FE
CL
AEM489
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EC-7
PRECAUTIONS AND PREPARATION
Supplemental Restraint System (SRS)
``AIR BAG''
The Supplemental Restraint System ``AIR BAG'', used along with a seat belt, helps 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 in the instrument panel on the
passenger side), a diagnosis sensor unit, a crash zone sensor (4WD models), warning lamp, wiring harness
and spiral cable.
The vehicle is equipped with a passenger air bag deactivation switch. Because no rear seat exists where a
rear-facing child restraint can be placed, the switch is designed to turn off the passenger air bag so that a
rear-facing child restraint can be used in the front passenger seat. The switch is located in the center of the
instrument panel, near the ashtray. When the switch is turned to the ON position, the passenger air bag is
enabled and could inflate in a frontal collision. When the switch is turned to the OFF position, the passenger
air bag is disabled and will not inflate in a frontal collision. A passenger air bag OFF indicator on the instru-
ment panel lights up when the passenger air bag is switched OFF. The driver air bag always remains enabled
and is not affected by the passenger air bag deactivation switch.
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 should be per-
formed by an authorized NISSAN dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses are covered with yellow insulation either just before the
harness connectors or on the complete harness, for easy identification.
q The vehicle is equipped with a passenger air bag deactivation switch which can be operated by
the customer. When the passenger air bag is switched OFF, the passenger air bag is disabled and
will not inflate in a frontal collision. When the passenger air bag is switched ON, the passenger air
bag is enabled and could inflate in a frontal collision. After SRS maintenance or repair, make sure
the passenger air bag deactivation switch is in the same position (ON or OFF) as when the vehicle
arrived for service.
Precautions for On Board Diagnostic (OBD)
System of Engine
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) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
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 Section, ``Description'', ``HARNESS CONNEC-
TOR''.
q Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MIL to light up due to the short circuit.
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 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
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EL
IDX
SEF236V
EC-9
PRECAUTIONS AND PREPARATION
Precautions
q Before connecting or disconnecting the ECM harness
connector, turn ignition switch OFF and disconnect nega-
tive 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 secur-
ing bolt until the gap between orange indicators disap-
pears.
: 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 Reference
Value inspection and make sure ECM functions properly.
Refer to EC-89.
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 completed.
SEF217U
EC-10
PRECAUTIONS AND PREPARATION
Precautions (Cont'd)
q When measuring ECM signals with a circuit tester, never GI
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor. MA
EM
LC
EC
FE
CL
MT
SEF348N
AT
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BR
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EL
IDX
EC-11
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Circuit Diagram
AEC867A
EC-12
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location GI
MA
EM
LC
EC
FE
CL
MT
AT
TF
PD
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RA
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SEF312V
EC-13
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Engine Control Component Parts Location
(Cont'd)
SEF313V SEF578P
EC-14
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Diagram GI
MA
EM
LC
EC
FE
CL
MT
AT
TF
PD
FA
RA
BR
ST
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BT
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EL
IDX
AEC868A
EC-15
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Vacuum Hose Drawing
SEF107V
Note: Do not use soapy water or any type of solvent while installing vacuum hoses or purge
hoses.
EC-16
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Chart GI
Camshaft position sensor Fuel injection & mixture ratio
control Injectors MA
Mass air flow sensor
EM
Distributor ignition system Power transistor
Engine coolant temperature sensor
LC
Front heated oxygen sensor
IACV-AAC valve and
Idle air control system IACV-FICD solenoid valve
Ignition switch EC
Throttle position sensor
Fuel pump control Fuel pump relay FE
*3
Closed throttle position switch CL
Front heated oxygen sensor
monitor & on board diagnostic Malfunction indicator lamp
Park/neutral position switch system (On the instrument panel)
MT
Air conditioner switch
ECM
EGR control EGRC-solenoid valve AT
Knock sensor
TF
Intake air temperature sensor Front heated oxygen sensor Front heated oxygen sensor
heater control heater
*1
PD
q EGR temperature sensor
q EVAP control system pressure
sensor
Rear heated oxygen sensor Rear heated oxygen sensor
heater control heater FA
Absolute pressure sensor
RA
Battery voltage EVAP canister purge flow con- EVAP canister purge volume
trol control solenoid valve
Power steering oil pressure switch
BR
Air conditioning cut control Air conditioner relay
Vehicle speed sensor ST
Tank fuel temperature sensor
Torque converter clutch lock-up Torque converter clutch sole- RS
cancellation control noid valve
*1
Crankshaft position sensor (OBD)
BT
*2 q EVAP canister vent control
Rear heated oxygen sensor valve
q Vacuum cut valve bypass HA
valve
q MAP/BARO switch solenoid
valve
EL
*1: These sensors are not used to control the engine system. They are used only for the on board diagnosis. IDX
*2: This sensor is not used to control the engine system under normal conditions.
*3: This switch will operate in place of the throttle position sensor to control EVAP parts if the sensor malfunctions.
EC-17
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System
INPUT/OUTPUT SIGNAL LINE
Camshaft position sensor Engine speed and piston position
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
Park/neutral position switch Gear position
Vehicle speed sensor Vehicle speed Injector
ECM
Ignition switch Start signal
Air conditioner switch Air conditioner operation
Knock sensor Engine knocking condition
Absolute pressure sensor Ambient barometric pressure
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 VARIOUS FUEL INJECTION
SYSTEM INCREASE/DECREASE COMPENSATION
The amount of fuel injected from the fuel injector is In addition, the amount of fuel injected is compen-
determined by the ECM. The ECM controls the sated to improve engine performance under various
length of time the valve remains open (injection 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 cam- q Hot-engine operation
shaft position sensor and the mass air flow sensor. 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 GI
LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mix-
MA
ture ratio for driveability and emission control. The three way cata-
lyst can then better reduce CO, HC and NOx emissions. This sys-
tem uses a front heated oxygen sensor in the exhaust manifold to
monitor if the engine operation is rich or lean. The ECM adjusts the
EM
injection pulse width according to the sensor voltage signal. For
more information about the front heated oxygen sensor, refer to
EC-150. This maintains the mixture ratio within the range of sto- LC
SEF651V ichiometric (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 EC
way catalyst. Even if the switching characteristics of the front
heated oxygen sensor shift, the air-fuel ratio is controlled to sto-
ichiometric by the signal from the rear heated oxygen sensor. 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.
q Deceleration and acceleration MT
q High-load, high-speed operation
q Malfunction of front heated oxygen sensor or its circuit
q Insufficient activation of front heated oxygen sensor at low AT
engine coolant temperature
q High engine coolant temperature
q During warm-up T ◦ Jabse Service Manual Search 2025 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo