2004 INFINITI QX56 relay

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-45
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
MA
B
BRC
Revision: August 20072004 QX56
3. CHECKING ABS MOTOR AND MOTOR RELAY POWER SYSTEM
1. Check voltage between ABS actuator and electric unit (control
unit) harness connector E125 and body ground.
2. Check resistance between ABS actuator and electric unit (con-
trol unit) connector E125 and body ground.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-66, "
Removal and Installation" .
NG >> Repair the circuit.
Stop Lamp Switch System InspectionEFS003R5
INSPECTION PROCEDURE
1. SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
Yes >> GO TO 2.
No >> Inspection End.
2. CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125 and stop lamp switch connec-
tor E38.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.ABS actuator and electric
unit (control unit)
connector E125Body
groundMeasured
value
(Approx.)
1 (Y) — 12V
WFIA0209E
ABS actuator and electric
unit (control unit)
harness connector E125Body
groundMeasured
value Ω
(Approx.)
16 (B) — 0Ω
47 (B) — 0Ω
WFIA0196E
Self-diagnosis results
STOP LAMP SW

BRC-46
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
3. STOP LAMP SWITCH INSPECTION
Check the voltage between the ABS actuator and electric unit (con-
trol unit) harness connector E125 terminal 41 (R/B) and body
ground.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-66, "
Removal and Installation" .
NG >> GO TO 4.
4. STOP LAMP RELAY CIRCUIT INSPECTION
1. Disconnect the stop lamp relay harness connector E12.
2. Check the continuity between the ABS actuator and electric unit
(control unit) harness connector E125 terminal 41 (R/B) and
stop lamp relay harness connector E12 terminal 4 (R/B).
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-66, "
Removal and Installation" .
NG >> Refer to LT-103, "
STOP LAMP" .
ABS/TCS/VDC Control Unit Power and Ground Systems InspectionEFS003R6
INSPECTION PROCEDURE
1. SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
Yes >> GO TO 2.
No >> Inspection End.
2. CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.Brake pedal depressed : Battery voltage
(approx. 12V)
Brake pedal not depressed : Approx. 0V
WFIA0198E
Continuity should exist
LFIA0218E
Self-diagnosis results
BATTERY VOLTAGE

DI-44
WARNING CHIME
Revision: August 20072004 QX56
System DescriptionEKS007EF
FUNCTION
Power is supplied at all times

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70, and

through 10A fuse [No. 19, located in the fuse block (J/B)]

to key switch and key lock solenoid terminal 3.
With ignition switch in ON or START position, power is supplied

through 10A fuse [No. 59, located in the fuse and relay box)

to BCM terminal 38.
Ground is supplied

to BCM terminal 67

through body grounds M57, M61, and M79.
NOTE:
When ignition key warning chime, light warning chime, and seat belt warning chime are required at the same
time, the priorities for each chime are the following.
1. Light warning chime
2. Ignition key warning chime
3. Seat belt warning chime
IGNITION KEY WARNING CHIME
With the key inserted in the ignition switch, the ignition switch in OFF position, and the driver's door open, the
warning chime will sound.
Power is supplied

through key switch and key lock solenoid terminal 4

to BCM terminal 37.
Ground is supplied

to BCM terminal 47

through front door switch LH terminal 2.
Front door switch LH is case grounded.
BCM detects key inserted into the ignition switch, and sends key warning signal to combination meter via CAN
communication lines. When the combination meter receives key warning signal, it sounds warning chime.
LIGHT WARNING CHIME
With the key removed from the ignition switch, the driver's door open, and the lighting switch (part of the com-
bination switch) in 1st or 2nd position, the warning chime will sound. [Except when headlamp battery saver
control operates (5 minutes after ignition switch is turned to OFF or ACC position) and headlamps do not illu-
minate.]
Signal is supplied

from combination switch (lighting switch) terminals 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10

to BCM terminals 2, 3, 4, 5, 6, 32, 33, 34, 35 and 36.
NOTE:
BCM detected lighting switch in 1st or 2nd position. Refer to BCS-3, "
COMBINATION SWITCH READING
FUNCTION" .
Ground is supplied

to BCM terminal 47

through front door switch LH terminal 2.
Front door switch LH is case grounded.
BCM detects headlamps are illuminated, and sends light warning signal to combination meter CAN communi-
cation lines. When the combination meter receives light warning signal, it sounds warning chime.
SEAT BELT WARNING CHIME
When the ignition switch is turned ON with the seat belt unfastened (seat belt buckle switch LH unfastened),
warning chime will sound for approximately 6 seconds.

DI-60
REAR SONAR SYSTEM
Revision: August 20072004 QX56
System DescriptionEKS007ET
FUNCTION
With the ignition switch in the ON or START position, power is supplied

through 10A fuse [No. 12 , located in the fuse block (J/B)]

to sonar control unit terminal 8, and

through 10A fuse [No. 51, located in the IPDM E/R]

to back-up lamp relay terminals 1 and 3.
Ground is supplied

to sonar control unit terminal 6

through body grounds B7 and B19.
With the ignition switch in the ON or START position, and the transmission gear selector lever in the R posi-
tion, power is supplied

to sonar control unit terminal 5

from back-up lamp relay terminal 5.
With power and ground supplied, transmission gear selector lever in R position, and the rear sonar system
OFF switch ON, the rear sonar system will detect obstacles within 1.8 m (5.9 ft.) of the rear sonar sensors.
The vehicle operator is notified of obstacles by varied rate of tone from the sonar buzzer depending on dis-
tance of obstacle being sensed.
REAR SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in R position, the
sonar system can be disabled and the sonar buzzer silenced by momentarily pressing the rear sonar system
OFF switch. The rear sonar system OFF indicator lamp will be illuminated in the rear sonar system OFF
switch.
To disable the rear sonar system, ground is supplied

to sonar control unit terminal 13

through rear sonar system OFF switch terminal 1

through rear sonar system OFF switch terminal 2

from body grounds M57, M61, and M79.
To light the rear sonar system OFF indicator, power is supplied

to the rear sonar system OFF switch terminal 5

from sonar control unit terminal 4.
Ground is supplied

to the rear sonar system OFF switch terminal 6

from body grounds M57, M61, and M79.
The rear sonar system and buzzer will be disabled and the rear sonar system OFF indicator will be illuminated
until the ignition switch is turned OFF. When the ignition switch is turned ON, the rear sonar system will be
enabled. Depressing the rear sonar system OFF switch momentarily will enable the rear sonar system also.
Enabling the rear sonar system will cause the rear sonar system OFF indicator to go out.
SONAR BUZZER
With power supplied to the sonar control unit and the transmission gear selector lever in R position, a station-
ary object that is at least 7.0 cm (2.8 in.) wide and 1.0 m (39.0 in.) tall and that is closer than 1.8 meters (5.9 ft.)
will be detected by the rear sonar sensors, causing the sonar buzzer to sound a tone. As the vehicle moves
closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10 in.) from the
rear bumper, the tone will sound continuously.
Power is supplied

to sonar buzzer terminal +

from sonar control unit terminal 7.
Ground is supplied

to sonar buzzer terminal -

from sonar control unit terminal 3.

DI-72
REAR VIEW MONITOR
Revision: August 20072004 QX56
REAR VIEW MONITORPFP:28260
System DescriptionEKS007R4

When the A/T selector is in the reverse position, the display shows view to the rear of the vehicle.

Lines which indicate the vehicle clearance and distances are displayed on the monitor.
POWER SUPPLY AND GROUND
Power is supplied at all times

through 20A fuse [No. 31, located in the fuse and fusible link box]

to rear view camera control unit terminal 1.
When ignition switch is in ACC or ON position, power is supplied

through 10A fuse [No. 4, located in the fuse block (J/B)]

to rear view camera control unit terminal 2.
Ground is supplied

to rear view camera control unit terminal 3 and

to rear view camera terminal 2

through grounds B7 and B19.
AV COMMUNICATION LINE
Rear view camera control unit is connected to the following units with AV communication line. Each unit trans-
mits/receives data with AV communication line.

NAVI control unit

Display unit

Display control unit

AV switch
REAR VIEW CAMERA OPERATION
When ignition switch is in ON or START position, power is supplied

through 10A fuse (No. 51, located in the IPDM E/R)

to back-up lamp relay terminals 1 and 3.
When A/T selector lever is in reverse position, power is supplied

through back-up lamp relay terminal 2

to TCM terminal 7.
Then, when back-up lamp relay is energized,

from back-up lamp relay terminal 5

to rear view camera control unit terminal 4.
Then, rear view camera control unit is sent camera ON signal

through rear view camera control unit terminal 8

to rear view camera terminal 1.
An image taken by rear view camera is sent

through rear view camera terminals 3 and 4

to rear view camera control unit terminals 10 and 9.
Then an image is sent

through rear view camera control unit terminals 11 and 12

to the display unit terminals 4 and 15.
An image of rear view will be projected on the display.
Side Distance Guideline
When A/T selector lever is in reverse position, rear view camera control unit is sent rear view camera guideline
image

through rear view camera control unit terminals 11 and 12

to the display unit terminals 4 and 15.

DI-84
REAR VIEW MONITOR
Revision: August 20072004 QX56
Rear View Is Not Displayed With The A/T Selector Lever In R PositionEKS007RC
1. BACK-UP LAMP INSPECTION
1. Turn ignition switch ON.
2. Shift A/T selector lever to R position.
Does back-up lamp illuminate?
YES >> GO TO 2.
NO >> Check back-up lamp system. Refer to LT-106, "
BACK-UP LAMP" .
2. CHECK REVERSE POSITION INPUT SIGNAL
With CONSULT-II
Select “DATA MONITOR” of “REARVIEW CAMERA”. Operate igni-
tion switch with “R POSI SIG” of “DATA MONITOR” and check oper-
ate status.
Without CONSULT-II
1. Turn ignition switch OFF.
2. Disconnect rear view camera control unit connector.
3. Turn ignition switch ON.
4. Shift A/T selector lever to R position.
5. Check voltage between rear view camera control unit harness
connector B73 terminal 4 (G/W) and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open or short between rear view
camera control unit and back-up lamp relay.
3. CHECK DISPLAY CONTROL UNIT OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect rear view camera control unit connector.
3. Turn ignition switch ON.
4. Check voltage between rear view camera control unit harness
connector B73 terminal 5 (BR) and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
SKIA7147E
Battery voltage should exist.
SKIA5086E
Voltage : Approx. 5V
SKIA7148E

EC-4Revision: August 20072004 QX56 Overall Function Check ........................................326
Diagnostic Procedure ...........................................327
DTC P0460 FUEL LEVEL SENSOR .......................334
Component Description ........................................334
On Board Diagnosis Logic ....................................334
DTC Confirmation Procedure ...............................334
Diagnostic Procedure ...........................................335
Removal and Installation ......................................335
DTC P0461 FUEL LEVEL SENSOR .......................336
Component Description ........................................336
On Board Diagnosis Logic ....................................336
Overall Function Check ........................................336
Diagnostic Procedure ...........................................337
Removal and Installation ......................................337
DTC P0462, P0463 FUEL LEVEL SENSOR CIR-
CUIT ........................................................................338
Component Description ........................................338
On Board Diagnosis Logic ....................................338
DTC Confirmation Procedure ...............................338
Diagnostic Procedure ...........................................339
Removal and Installation ......................................339
DTC P0500 VSS ......................................................340
Description ............................................................340
On Board Diagnosis Logic ....................................340
DTC Confirmation Procedure ...............................340
Overall Function Check ........................................340
Diagnostic Procedure ...........................................341
DTC P0506 ISC SYSTEM .......................................342
Description ............................................................342
On Board Diagnosis Logic ....................................342
DTC Confirmation Procedure ...............................342
Diagnostic Procedure ...........................................343
DTC P0507 ISC SYSTEM .......................................344
Description ............................................................344
On Board Diagnosis Logic ....................................344
DTC Confirmation Procedure ...............................344
Diagnostic Procedure ...........................................345
DTC P0550 PSP SENSOR ......................................346
Component Description ........................................346
CONSULT-II Reference Value in Data Monitor Mode
.346
On Board Diagnosis Logic ....................................346
DTC Confirmation Procedure ...............................346
Wiring Diagram .....................................................347
Diagnostic Procedure ...........................................348
Component Inspection ..........................................350
Removal and Installation ......................................350
DTC P0605 ECM .....................................................351
Component Description ........................................351
On Board Diagnosis Logic ....................................351
DTC Confirmation Procedure ...............................351
Diagnostic Procedure ...........................................352
DTC P1031, P1032, P1051, P1052 A/F SENSOR 1
HEATER ..................................................................354
Description ............................................................354
CONSULT-II Reference Value in Data Monitor Mode
.354
On Board Diagnosis Logic ....................................354
DTC Confirmation Procedure ...............................354Wiring Diagram ..................................................... 355
Diagnostic Procedure ............................................ 358
Component Inspection .......................................... 360
Removal and Installation ....................................... 360
DTC P1065 ECM POWER SUPPLY ........................ 361
Component Description ........................................ 361
On Board Diagnosis Logic .................................... 361
DTC Confirmation Procedure ................................ 361
Wiring Diagram ..................................................... 362
Diagnostic Procedure ............................................ 363
DTC P1121 ELECTRIC THROTTLE CONTROL
ACTUATOR ............................................................. 365
Component Description ........................................ 365
On Board Diagnosis Logic .................................... 365
DTC Confirmation Procedure ................................ 365
Diagnostic Procedure ............................................ 366
DTC P1122 ELECTRIC THROTTLE CONTROL
FUNCTION .............................................................. 367
Description ............................................................ 367
On Board Diagnosis Logic .................................... 367
DTC Confirmation Procedure ................................ 367
Wiring Diagram ..................................................... 368
Diagnostic Procedure ............................................ 369
Component Inspection .......................................... 372
Remove and Installation ....................................... 372
DTC P1124, P1126 THROTTLE CONTROL MOTOR
RELAY ..................................................................... 373
Component Description ........................................ 373
CONSULT-II Reference Value in Data Monitor Mode
. 373
On Board Diagnosis Logic .................................... 373
DTC Confirmation Procedure ................................ 373
Wiring Diagram ..................................................... 375
Diagnostic Procedure ............................................ 376
DTC P1128 THROTTLE CONTROL MOTOR ......... 378
Component Description ........................................ 378
On Board Diagnosis Logic .................................... 378
DTC Confirmation Procedure ................................ 378
Wiring Diagram ..................................................... 379
Diagnostic Procedure ............................................ 380
Component Inspection .......................................... 381
Removal and Installation ....................................... 382
DTC P1146, P1166 HO2S2 ..................................... 383
Component Description ........................................ 383
CONSULT-II Reference Value in Data Monitor Mode
. 383
On Board Diagnosis Logic .................................... 383
DTC Confirmation Procedure ................................ 384
Overall Function Check ......................................... 384
Wiring Diagram ..................................................... 386
Diagnostic Procedure ............................................ 389
Component Inspection .......................................... 392
Removal and Installation ....................................... 394
DTC P1147, P1167 HO2S2 ..................................... 395
Component Description ........................................ 395
CONSULT-II Reference Value in Data Monitor Mode
. 395
On Board Diagnosis Logic .................................... 395
DTC Confirmation Procedure ................................ 396

ENGINE CONTROL SYSTEM
EC-25
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
System ChartUBS00GZD
*1: This sensor is not used to control the engine system. This is used only for the on board diagnosis.
*2: This sensor is not used to control the engine system under normal conditions.
*3: This input signal is sent to the ECM through CAN communication line.
*4: This output signal is sent from the ECM through CAN communication line.Input (Sensor) ECM Function Output (Actuator)

Camshaft position sensor (PHASE)

Crankshaft position sensor (POS)

Mass air flow sensor

Engine coolant temperature sensor

A/F sensor 1

Throttle position sensor

Accelerator pedal position sensor

Park/neutral position (PNP) switch

Intake air temperature sensor

Power steering pressure sensor

Ignition switch

Battery voltage

Knock sensor

Refrigerant pressure sensor

Stop lamp switch

ASCD steering switch

ASCD brake switch

Fuel level sensor*1 *3

EVAP control system pressure sensor

Fuel tank temperature sensor*1

Heated oxygen sensor 2*2

TCM (Transmission control module)*3

ABS actuator and electric unit (control unit)*3

Air conditioner switch*3

Wheel sensor*3

Electrical load signal*3
Fuel injection & mixture ratio control Fuel injector
Electronic ignition system Power transistor
Nissan torque demand control system

Electric throttle control actuator

Fuel injector
Fuel pump control Fuel pump relay
ASCD vehicle speed control Electric throttle control actuator
On board diagnostic system
MIL (On the instrument panel)*
4
A/F sensor 1 heater control A/F sensor 1 heater
Heated oxygen sensor 2 heater control Heated oxygen sensor 2 heater
EVAP canister purge flow controlEVAP canister purge volume control
solenoid valve
Air conditioning cut control
Air conditioner relay*
4
Cooling fan control
Cooling fan relay*4
ON BOARD DIAGNOSIS for EVAP system EVAP canister vent control valve