2005 INFINITI QX4 diagram

WARNING CHIME
DI-47
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Terminals and Reference Value for Combination MeterEKS00BCT
How to Proceed With Trouble DiagnosisEKS00BCU
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to DI-42, "
System Description" .
3. Perform the preliminary check. Refer to DI-47, "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the warning chime operate properly? If so, go to 6. If not, go to 3.
6. Inspection End.
Preliminary CheckEKS00BCV
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSE AND FUSIBLE LINK
Check for blown BCM fuse or fusible link.
Refer to DI-44, "Wiring Diagram — CHIME —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-
4, "POWER SUPPLY ROUTING CIRCUIT" .
35 O/B Combination switch output 2
ON

Light switch and wiper switch
OFF

Wiper dial position 4 36 R/W Combination switch output 1
37 B/R Key switch signal OFFKey is removed 0
Key is inserted Battery voltage
38 W/L Ignition switch ON or START ON — Battery voltage
39 L CAN-H — — —
40 P CAN-L — — —
47 SB Front door switch LH signal OFFON (open) 0
OFF (closed) 5
67 B Ground OFF — 0
70 W/B Battery power supply OFF — Battery voltage Te r m i n a l
No.Wire
colorItem Condition
Reference value (V)
(Approx.) Ignition
switchMeasurement method
SKIA5292E
Te r m i n a l
No.Wire
colorItem Condition
Reference value (V)
(Approx.) Ignition
switchMeasurement method
11 L C A N - H — — —
12 P CAN-L — — —
27 O/BSeat belt buckle pre-ten-
sioner assembly (seat belt
buckle switch) LH ONUnfastened (ON) 0
Fastened (OFF) Battery voltage
Unit Power source Fuse or fusible link No.
BCMBatteryf
Ignition switch ON or START 59

WARNING CHIME
DI-53
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Revision: October 20052005 QX56
3. CHECK FRONT DOOR SWITCH LH
Check continuity between front door switch LH terminal 2 and
exposed metal of switch while pressing and releasing switch.
OK or NG
OK >> Replace the BCM. Refer to BCS-20, "Removal and
Installation of BCM" .
NG >> Replace the front door switch LH.
Key Warning Chime Does Not OperateEKS00BCZ
1. CHECK FUSE
Check if the key switch fuse [No. 19, located in the fuse block (J/B)] is blown. Refer to DI-44, "
Wiring Diagram
— CHIME —" .
Is the fuse blown?
YES >> Replace the fuse. Be sure to repair the cause of malfunction before installing new fuse.
NO >> GO TO 2.
2. CHECK WARNING CHIME OPERATION
With key removed from the ignition key cylinder and the front door LH open, turn the lighting switch to 1st or
2nd position.
Does warning chime sound?
YES >> GO TO 3.
NO >> Go to DI-51, "
All Warning Chimes Do Not Operate" or DI-52, "Key Warning Chime and Light
Warning Chime Do Not Operate (Seat Belt Warning Chime Does Operate)" . When front door switch
LH is released: Continuity should exist.
When front door switch
LH is pressed: Continuity should not
exist.
WKIA2023E

REAR SONAR SYSTEM
DI-61
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Wiring Diagram — SONAR —EKS00BD4
WKWA2373E

DI-66
REAR SONAR SYSTEM
Revision: October 20052005 QX56
Preliminary CheckEKS00BD9
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSE
Check for blown rear sonar system fuse.
Refer to DI-61, "
Wiring Diagram — SONAR —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to PG-4,
"POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect sonar control unit connector.
2. Check voltage between sonar control unit connector B56 termi-
nal 8 (G/R) and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between sonar control unit and fuse.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between sonar control unit B56 terminal 6 and
ground.
OK or NG
OK >> Inspection End.
NG >> Check harness ground circuit.
Unit Power Source Fuse
Sonar control unit ON or START 12
Terminals Ignition switch position
(+)
(-) ON or START
ConnectorTe r m i n a l
(Wire color)
B56 8 (G/R) Ground Battery voltage
WKIA1145E
Te r m i n a l s
Continuity (+)
(–)
ConnectorTerminal
(Wire color)
B56 6 (B) Ground Yes
WKIA1146E

CLOCK
DI-69
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CLOCKPFP:25820
Wiring Diagram — CLOCK —EKS00BDD
WKWA1178E

DI-74
REAR VIEW MONITOR
Revision: October 20052005 QX56
Wiring Diagram — R/VIEW —EKS00BDI
WKWA2376E

EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
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SECTION EC
A
EC
Revision: October 20052005 QX56 INDEX FOR DTC ........................................................ 8
DTC No. Index ......................................................... 8
Alphabetical Index .................................................. 12
PRECAUTIONS ........................................................ 16
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 16
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................... 16
Precaution .............................................................. 16
Wiring Diagrams and Trouble Diagnosis ................ 19
PREPARATION ......................................................... 20
Special Service Tools ............................................. 20
Commercial Service Tools ...................................... 22
ENGINE CONTROL SYSTEM .................................. 23
System Diagram ..................................................... 23
Multiport Fuel Injection (MFI) System .................... 24
Electronic Ignition (EI) System ............................... 26
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 27
AIR CONDITIONING CUT CONTROL ..................... 28
Input/Output Signal Chart ....................................... 28
System Description ................................................ 28
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ... 29
System Description ................................................ 29
Component Description .......................................... 30
CAN COMMUNICATION .......................................... 31
System Description ................................................ 31
EVAPORATIVE EMISSION SYSTEM ....................... 32
Description ............................................................. 32
Component Inspection ........................................... 35
Removal and Installation ........................................ 36
How to Detect Fuel Vapor Leakage ....................... 37
ON BOARD REFUELING VAPOR RECOVERY
(ORVR) ...................................................................... 39
System Description ................................................ 39
Diagnostic Procedure ............................................. 40
Component Inspection ........................................... 43
POSITIVE CRANKCASE VENTILATION ................. 45Description .............................................................. 45
Component Inspection ............................................ 45
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-
NATS) ........................................................................ 47
Description .............................................................. 47
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 48
Introduction ............................................................. 48
Two Trip Detection Logic ........................................ 48
Emission-related Diagnostic Information ................ 49
Malfunction Indicator Lamp (MIL) ........................... 64
OBD System Operation Chart ................................ 66
BASIC SERVICE PROCEDURE ............................... 72
Basic Inspection ..................................................... 72
Idle Speed and Ignition Timing Check .................... 77
Idle Mixture Ratio Adjustment ................................. 79
VIN Registration ..................................................... 90
Accelerator Pedal Released Position Learning ...... 90
Throttle Valve Closed Position Learning ................. 90
Idle Air Volume Learning ........................................ 91
Fuel Pressure Check .............................................. 93
TROUBLE DIAGNOSIS ............................................ 95
Trouble Diagnosis Introduction ............................... 95
DTC Inspection Priority Chart ...............................101
Fail-safe Chart ......................................................103
Symptom Matrix Chart ..........................................104
Engine Control Component Parts Location ..........108
Vacuum Hose Drawing .........................................114
Circuit Diagram .....................................................115
ECM Harness Connector Terminal Layout ...........117
ECM Terminals and Reference Value ...................117
CONSULT-II Function (ENGINE) ..........................126
Generic Scan Tool (GST) Function .......................139
CONSULT-II Reference Value in Data Monitor .....141
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................144
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .146
Description ............................................................146
Testing Condition ..................................................146
Inspection Procedure ............................................146
Diagnostic Procedure ...........................................147

EC-2Revision: October 20052005 QX56 TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
DENT .......................................................................156
Description ............................................................156
Diagnostic Procedure ...........................................156
POWER SUPPLY AND GROUND CIRCUIT ...........157
Wiring Diagram .....................................................157
Diagnostic Procedure ...........................................158
Ground Inspection ................................................162
DTC U1000, U1001 CAN COMMUNICATION LINE .163
Description ............................................................163
On Board Diagnosis Logic ....................................163
DTC Confirmation Procedure ...............................163
Wiring Diagram .....................................................164
Diagnostic Procedure ...........................................165
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER .166
Description ............................................................166
CONSULT-II Reference Value in Data Monitor Mode
.166
On Board Diagnosis Logic ....................................166
DTC Confirmation Procedure ...............................167
Wiring Diagram .....................................................168
Diagnostic Procedure ...........................................171
Component Inspection ..........................................173
Removal and Installation ......................................173
DTC P0101 MAF SENSOR .....................................174
Component Description ........................................174
CONSULT-II Reference Value in Data Monitor Mode
.174
On Board Diagnosis Logic ....................................174
DTC Confirmation Procedure ...............................175
Overall Function Check ........................................176
Wiring Diagram .....................................................177
Diagnostic Procedure ...........................................178
Component Inspection ..........................................181
Removal and Installation ......................................182
DTC P0102, P0103 MAF SENSOR .........................183
Component Description ........................................183
CONSULT-II Reference Value in Data Monitor Mode
.183
On Board Diagnosis Logic ....................................183
DTC Confirmation Procedure ...............................184
Wiring Diagram .....................................................185
Diagnostic Procedure ...........................................186
Component Inspection ..........................................189
Removal and Installation ......................................190
DTC P0112, P0113 IAT SENSOR ...........................191
Component Description ........................................191
On Board Diagnosis Logic ....................................191
DTC Confirmation Procedure ...............................191
Wiring Diagram .....................................................192
Diagnostic Procedure ...........................................193
Component Inspection ..........................................194
Removal and Installation ......................................194
DTC P0117, P0118 ECT SENSOR ..........................195
Component Description ........................................195
On Board Diagnosis Logic ....................................195
DTC Confirmation Procedure ...............................196
Wiring Diagram .....................................................197
Diagnostic Procedure ...........................................198Component Inspection .......................................... 199
Removal and Installation ....................................... 200
DTC P0122, P0123 TP SENSOR ............................ 201
Component Description ........................................ 201
CONSULT-II Reference Value in Data Monitor Mode
. 201
On Board Diagnosis Logic .................................... 201
DTC Confirmation Procedure ................................ 202
Wiring Diagram ..................................................... 203
Diagnostic Procedure ............................................ 204
Component Inspection .......................................... 207
Removal and Installation ....................................... 207
DTC P0125 ECT SENSOR ...................................... 208
Component Description ........................................ 208
On Board Diagnosis Logic .................................... 208
DTC Confirmation Procedure ................................ 209
Diagnostic Procedure ............................................ 209
Component Inspection .......................................... 210
Removal and Installation ....................................... 210
DTC P0127 IAT SENSOR ........................................211
Component Description ........................................211
On Board Diagnosis Logic ....................................211
DTC Confirmation Procedure ................................211
Diagnostic Procedure ............................................ 212
Component Inspection .......................................... 213
Removal and Installation ....................................... 213
DTC P0128 THERMOSTAT FUNCTION ................. 214
On Board Diagnosis Logic .................................... 214
DTC Confirmation Procedure ................................ 214
Diagnostic Procedure ............................................ 214
Component Inspection .......................................... 215
Removal and Installation ....................................... 215
DTC P0138, P0158 HO2S2 ..................................... 216
Component Description ........................................ 216
CONSULT-II Reference Value in Data Monitor Mode
. 216
On Board Diagnosis Logic .................................... 216
DTC Confirmation Procedure ................................ 217
Wiring Diagram ..................................................... 218
Diagnostic Procedure ............................................ 221
Component Inspection .......................................... 223
Removal and Installation ....................................... 224
DTC P0139, P0159 HO2S2 ..................................... 225
Component Description ........................................ 225
CONSULT-II Reference Value in Data Monitor Mode
. 225
On Board Diagnosis Logic .................................... 225
DTC Confirmation Procedure ................................ 226
Overall Function Check ......................................... 226
Wiring Diagram ..................................................... 228
Diagnostic Procedure ............................................ 231
Component Inspection .......................................... 234
Removal and Installation ....................................... 235
DTC P0171, P0174 FUEL INJECTION SYSTEM
FUNCTION .............................................................. 236
On Board Diagnosis Logic .................................... 236
DTC Confirmation Procedure ................................ 236
Wiring Diagram ..................................................... 238
Diagnostic Procedure ............................................ 240