2007 INFINITI QX56 Factory Service Manual

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Page 2841 of 3061

INFINITI QX56 2007 Factory Service Manual ALL-MODE 4WD SYSTEM
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< SERVICE INFORMATION >
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*: When 4WD warning lamp is ON, all the 4WD shift indicator lamps turn OFF.
ATP WARNING LAMP
Even if A/T selector leve

ALL-MODE 4WD SYSTEM
TF-19
< SERVICE INFORMATION >
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*: When 4WD warning lamp is ON, all the 4WD shift indicator lamps turn OFF.
ATP WARNING LAMP
Even if A/T selector lever is in “P” position, vehicle may move because A/T parking mechanism does not oper-
ate when transfer is under neutral condition. ATP warning lamp is turned on so as to indicate this condition to
the driver.
SchematicINFOID:0000000003532518
COMPONENTS FUNCTION
High fluid temperature in transfer unitWhen fluid temperature is high or fluid temperature sensor cir-
cuit is shorted, it flickers twice every second.
It turns OFF when fluid temperature becomes normal.Flickers twice a second.
Other than above (System is normal.) Lamp is OFF. OFFCondition Content 4WD warning lamp
WDIA0164E
Component parts Function
Transfer control unit Controls transfer control device and control valves.
Transfer control device Actuator motor and actuator position switch are integrated so as to switch driving types.
2-4WD shift solenoid valve Controls oil pressure and allows selection between 2WD and 4WD.
Clutch pressure solenoid valve Controls oil pressure and distributes torque (front and rear).
Line pressure switch Detects line pressure.
Clutch pressure switch Detects clutch pressure.
Transfer fluid temperature sen-
sorDetects transfer fluid temperature.
Wait detection switch Detects whether or not 4WD lock gear is locked.
Neutral-4LO switch Detects that transfer is under neutral-4LO condition (or shifting through neutral).
ATP switch Detects that transfer is under neutral condition.
4WD shift switch Allows selection from 2WD, AUTO, 4H or 4LO.
4WD warning lamp• Illuminates if malfunction is detected in electrical system of 4WD system.
• There is 1 blink every 2 seconds if rotation difference of front wheels and rear wheels is large.
• There is 2 blinks every 1 second if high transfer fluid temperature is detected.
AT P w a r n i n g l a m pIndicates that A/T parking mechanism does not operate when A/T selector lever is in “P” position and
transfer is under neutral condition.
4WD shift indicator lamp Displays driving condition selected by 4WD shift switch.
4LO indicator lamp Displays 4LO condition.

Page 2842 of 3061

INFINITI QX56 2007 Factory Service Manual TF-20
< SERVICE INFORMATION >
ALL-MODE 4WD SYSTEM
CAN Communication
INFOID:0000000003532519
SYSTEM DESCRIPTION
Refer to LAN-4.
ABS actuator and electric unit
(control unit)Transmits vehicle speed si

Page 2843 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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< SERVICE INFORMATION >
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TROUBLE DIAGNOSIS
How to Perform Trouble DiagnosisINFOID:0000000003532520
BASIC CONCEPT
• To perform trouble diagnosis

Page 2844 of 3061

INFINITI QX56 2007 Factory Service Manual TF-22
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Location of Electrical Parts
INFOID:0000000003532521
WDIA0220E

Page 2845 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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Circuit DiagramINFOID:0000000003532522
BDWA0101E

Page 2846 of 3061

INFINITI QX56 2007 Factory Service Manual TF-24
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
Wiring Diagram - T/F -
INFOID:0000000003532523
BDWA0166E

Page 2847 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
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< SERVICE INFORMATION >
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BDWA0167E

Page 2848 of 3061

INFINITI QX56 2007 Factory Service Manual TF-26
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
BDWA0168E

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