2005 INFINITI QX4 Factory Service Manual

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INFINITI QX4 2005 Factory Service Manual TF-18
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
LINE PRESSURE SWITCH
With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front whee

TF-18
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
LINE PRESSURE SWITCH
With the transfer system design, control of the oil pressure provides the transmission of drive torque to the
front wheels. The main pressure to control the oil pressure is referred to as the line pressure.
The line pressure switch determines whether or not adequate line pressure has built up under different
operating conditions.
The line pressure switch turns ON when line pressure is produced.
The line pressure switch senses line pressure abnormalities and turns the 4WD warning lamp ON.
CLUTCH PRESSURE SWITCH
The clutch pressure switch determines whether or not adequate clutch pressure has built up under differ-
ent operating conditions.
The clutch pressure switch turns ON when clutch pressure is produced.
The clutch pressure switch senses clutch pressure abnormalities and turns the 4WD warning lamp ON.
TRANSFER FLUID TEMPERATURE SENSOR
The transfer temperature sensor detects the transfer fluid temperature and sends a signal to the transfer con-
trol unit.
TRANSFER CONTROL UNIT
Transfer control unit controls transfer control device by input signals of each sensor and each switch.
Self-diagnosis can be done.
TRANSFER CONTROL DEVICE
The transfer control device changes the state of transfer assembly between 2WD, AUTO, 4H⇔4LO with the
2WD, AUTO, 4H and 4LO signals of 4WD shift switch.
NOTE:
To shift between 4H⇔4LO, stop the vehicle, depress the brake pedal and shift the transmission selector
to the "N" position. Depress and turn the 4WD shift switch. The shift switch will not shift to the desired
mode if the transmission is not in "N" or the vehicle is moving. The 4LO indicator lamp will be lit when the
4LO is engaged.
Actuator motor and actuator position switch are integrated.
4WD SHIFT SWITCH AND INDICATOR LAMP
4WD Shift Switch
The 4WD shift switch allows selection from 2WD, AUTO, 4H or 4LO.
4WD Shift Indicator Lamp
Displays driving conditions selected by 4WD shift switch with 2WD, AUTO and 4H indicators while engine
is running. (When 4WD warning lamp is turned on, all 4WD shift indicator lamps are turned off.)
Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.
4LO Indicator Lamp
Displays 4LO condition while engine is running. 4LO indicator lamp flashes if transfer gear does not shift
completely under 2WD, AUTO, 4H⇔4LO. (When 4WD warning lamp is turned on, 4LO indicator lamp is
turned off.)
Turns ON for approximately 1 second when ignition switch is turned ON, for purpose of lamp check.

Page 3162 of 3419

INFINITI QX4 2005 Factory Service Manual ALL-MODE 4WD SYSTEM
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Revision: October 20052005 QX56
4WD WARNING LAMP
Turns ON or FLASH when there is a malfunction in 4WD system.
Also turns ON when ignition switch is

Page 3163 of 3419

INFINITI QX4 2005 Factory Service Manual TF-20
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
COMPONENTS FUNCTION
CAN CommunicationEDS002HC
SYSTEM DESCRIPTION
Refer to LAN-5, "CAN COMMUNICATION" .
Component parts Function
Transfer cont

TF-20
ALL-MODE 4WD SYSTEM
Revision: October 20052005 QX56
COMPONENTS FUNCTION
CAN CommunicationEDS002HC
SYSTEM DESCRIPTION
Refer to LAN-5, "CAN COMMUNICATION" .
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.
ATP warning lampIndicates 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.
ABS actuator and electric unit
(control unit)Transmits vehicle speed signal via CAN communication to transfer control unit.
TCMTransmits the following signals via CAN communication to transfer control unit.
Output shaft revolution signal
A/T position indicator signal (PNP switch signal)
ECMTransmits the following signals via CAN communication to transfer control unit.
Engine speed signal
Accelerator pedal position signal

Page 3164 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: October 20052005 QX56
TROUBLE DIAGNOSISPFP:00004
How to Perform Trouble DiagnosisEDS002HD
BASIC CONCEPT
To perform trouble diagnosis, it is

Page 3165 of 3419

INFINITI QX4 2005 Factory Service Manual TF-22
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
Location of Electrical PartsEDS002HE
WDIA0220E

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INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
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Circuit DiagramEDS002HF
WDWA0015E

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INFINITI QX4 2005 Factory Service Manual TF-24
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
Wiring Diagram — T/F —EDS002HG
WDWA0016E

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INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS
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Revision: October 20052005 QX56
WDWA0017E

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