relay INFINITI QX56 2004 Factory Repair Manual

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
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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

EC-30Revision: August 2007
ENGINE CONTROL SYSTEM
2004 QX56
Air Conditioning Cut ControlUBS00GZH
INPUT/OUTPUT SIGNAL CHART
*1: Signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.

When the accelerator pedal is fully depressed.

When cranking the engine.

At high engine speeds.

When the engine coolant temperature becomes excessively high.

When operating power steering during low engine speed or low vehicle speed.

When engine speed is excessively low.

When refrigerant pressure is excessively low or high.
Fuel Cut Control (at No Load and High Engine Speed)UBS00GZI
INPUT/OUTPUT SIGNAL CHART
*1: Signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 1,400 rpm under no load (for example, the shift position is neutral and engine
speed is over 1,400 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,000 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System, EC-26
.
Sensor Input signal to ECM ECM function Actuator
Air conditioner switch*
1Air conditioner ON signal
Air conditioner
cut controlAir conditioner relay Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Wheel sensor*
1Vehicle speed
Sensor Input signal to ECM ECM function Actuator
Park/neutral position (PNP) switch Neutral position
Fuel cut control Fuel injector Accelerator pedal position sensor Accelerator pedal position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
Wheel sensor*
1Vehicle speed

EC-78Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting MIL up when
there is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands
the driver to repair the malfunction.
P0122
P0123
P0222
P0223
P2135Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
P1121 Electric throttle control
actuator(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,
the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P1122 Electric throttle control
functionECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1124
P1126Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1128 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1229 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2122
P2123
P2127
P2128
P2138Accelerator pedal position
sensorThe ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor. DTC No. Detected items Engine operating condition in fail-safe mode
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut

TROUBLE DIAGNOSIS
EC-97
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Revision: August 20072004 QX563LThrottle control motor relay
power supply[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
4 L/W Throttle control motor (Close)[Ignition switch: ON]

Engine stopped

Shift lever position: D

Accelerator pedal: Released0 - 14V
5 L/B Throttle control motor (Open)[Ignition switch: ON]

Engine stopped

Shift lever position: D

Accelerator pedal: Fully depressed0 - 14V
6GRHeated oxygen sensor 2
heater (bank 1)[Engine is running]

Engine speed is below 3,600 rpm after the
following conditions are met.
–Engine: After warming up
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load0 - 1.0V
[Ignition switch: ON]

Engine stopped
[Engine is running]

Engine speed is above 3,600 rpm.BATTERY VOLTAGE
(11 - 14V)
12 RPower steering pressure
sensor[Engine is running]

Steering wheel is being turned.0.5 - 4.5V
[Engine is running]

Steering wheel is not being turned.0.4 - 0.8V
13 OCrankshaft position sensor
(POS)[Engine is running]

Warm-up condition

Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.1.0 - 2.0V
[Engine is running]

Engine speed is 2,000 rpm.1.0 - 2.0V TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIB1104E
PBIB1105E
PBIB1041E
PBIB1042E

EC-102Revision: August 2007
TROUBLE DIAGNOSIS
2004 QX56
99 G/YICC steering switch
(models with ICC system)[Ignition switch: ON]

ICC steering switch: OFFApproximately 4.3V
[Ignition switch: ON]

ON/OFF(MAIN) switch: PressedApproximately 0V
[Ignition switch: ON]

CANCEL switch: PressedApproximately 1.3V
[Ignition switch: ON]

DISTANCE switch: PressedApproximately 2.2V
[Ignition switch: ON]

COAST/SET switch: PressedApproximately 3.0V
[Ignition switch: ON]

ACCEL/RESUME switch: PressedApproximately 3.7V
99 G/YASCD steering switch
(models with ASCD system)[Ignition switch: ON]

ASCD steering switch: OFFApproximately 4V
[Ignition switch: ON]

ON/OFF(MAIN) switch: PressedApproximately 0V
[Ignition switch: ON]

CANCEL switch: PressedApproximately 1V
[Ignition switch: ON]

COAST/SET switch: PressedApproximately 2V
[Ignition switch: ON]

ACCEL/RESUME switch: PressedApproximately 3V
101 R/W Stop lamp switch[Ignition switch: OFF]

Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]

Brake pedal: DepressedBATTERY VOLTAGE
(11 - 14V)
102 GR/R PNP switch[Ignition switch: ON]

Shift lever position: P or NApproximately 0V
[Ignition switch: ON]

Except the above gear positionBATTERY VOLTAGE
(11 - 14V)
104 O Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
106 BR/WAccelerator pedal position
sensor 1[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released0.5 - 1.0V
[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed3.9 - 4.7V
107 V/RFuel tank temperature sen-
sor[Engine is running]Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature.
108 BR/W ASCD brake switch[Ignition switch: ON]

Brake pedal: DepressedApproximately 0V
[Ignition switch: ON]

Brake pedal: Fully releasedBATTERY VOLTAGE
(11 - 14V) TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)

TROUBLE DIAGNOSIS
EC-103
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Revision: August 20072004 QX56
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
CONSULT-II FunctionUBS00H05
FUNCTION
*1: The following emission-related diagnostic information is cleared when the ECM memory is erased.

Diagnostic trouble codes

1st trip diagnostic trouble codes

Freeze frame data

1st trip freeze frame data 109 B/R Ignition switch[Ignition switch: OFF]0V
[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
111 W /BECM relay
(Self shut-off)[Engine is running]
[Ignition switch: OFF]

For a few seconds after turning ignition
switch OFF0 - 1.5V
[Ignition switch: OFF]

More than a few seconds after turning igni-
tion switch OFFBATTERY VOLTAGE
(11 - 14V)
113 GR Fuel pump relay[Ignition switch: ON]

For 1 second after turning ignition switch
ON
[Engine is running]0 - 1.5V
[Ignition switch: ON]

More than 1 second after turning ignition
switch ONBATTERY VOLTAGE
(11 - 14V)
11 5
11 6B
B/WECM ground[Engine is running]

Idle speedBody ground
11 7 L / YEVAP canister vent control
valve[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
11 9
120BR
BRPower supply for ECM[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
121 WPower supply for ECM
(Back-up)[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V) TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
Diagnostic test mode Function
Work supportThis mode enables a technician to adjust some devices faster and more accurately by following the
indications on the CONSULT-II unit.
Self-diagnostic resultsSelf-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*
1
Data monitor Input/Output data in the ECM can be read.
Data monitor (SPEC)Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the
other data monitor items can be read.
CAN diagnostic support
monotorThe results of transmit/receive diagnosis of CAN communication can be read.
Active testDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also
shifts some parameters in a specified range.
DTC & SRT confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
Function test This mode is used to inform customers when their vehicle condition requires periodic maintenance.
ECM part number ECM part number can be read.

TROUBLE DIAGNOSIS
EC-105
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Revision: August 20072004 QX56
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-54, "
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME
DATA" .
INSPECTION PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
1. Turn ignition switch OFF.
2. Connect “CONSULT-II” and “CONSULT-II CONVERTER” to
data link connector, which is located under LH dash panel near
the center console.
3. Turn ignition switch ON.
4. Touch “START (NISSAN BASED VHCL)”.
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Injector×× ×
Power transistor (Ignition timing)×× ×
Throttle control motor relay×××
Throttle control motor×
EVAP canister purge volume con-
trol solenoid valve×××××
Air conditioner relay××
Fuel pump relay××××
Cooling fan relay××××
A/F sensor 1 heater××××
Heated oxygen sensor 2 heater××××
EVAP canister vent control valve×× ×××
Calculated load value××× ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*1FREEZE
FRAME
DATA*2SRT
STATUSDTC
WORK
SUP-
PORT
BBIA0369E
BCIA0029E