Infiniti QX56 (JA60). Manual - part 272

 

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Infiniti QX56 (JA60). Manual - part 272

 

 

4WD SYSTEM

DLN-11

< FUNCTION DIAGNOSIS >

[ATX14B]

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System Description

INFOID:0000000005148771

CONTROL SYSTEM

ABS actuator and electric unit 
(control unit)

Transmits vehicle speed signal via CAN communication to transfer control unit.

TCM

Transmits the following signal via CAN communication to transfer control unit.
• Output shaft revolution signal
• A/T position indicator signal (transmission range switch signal)

ECM

Transmits the following signals via CAN communication to transfer control unit.
• Engine speed signal
• Accelerator pedal position signal

Components

Function

DLN-12

< FUNCTION DIAGNOSIS >

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4WD SYSTEM

ALL-MODE 4WD Transfer Basic Control

SDIA3396E

4WD SYSTEM

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Hydraulic Control Circuits

TRANSFER CONTROL UNIT

• Transfer control unit controls transfer control device and it directs shifts from 4H-4LO and 2WD-4WD.

• Self-diagnosis can be done.

TRANSFER SHIFT HIGH AND LOW RELAYS

Transfer shift high and low relays apply power supply to transfer control device (actuator motor).

TRANSFER SHUT OFF RELAY

Transfer shut off relay applies power supply to transfer motor relay.

4WD SHIFT SWITCH AND INDICATOR LAMPS

4WD Shift Switch

Able to select 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

LDIA0055E

WDIA0163E

DLN-14

< FUNCTION DIAGNOSIS >

[ATX14B]

4WD SYSTEM

• 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.

4WD WARNING LAMP

Turns on or flashes when there is a malfunction in 4WD system.

Also turns on when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately 1 sec-

ond after the engine starts if system is normal.

4WD Warning Lamp Indication

ATP WARNING LAMP

When the A/T selector lever is in P position, the vehicle may move if the transfer case is in neutral.  ATP warn-

ing lamp is turned on to indicate this condition to the driver.

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 oper-

ating conditions. 

• The line pressure switch closes 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 different

operating conditions. 

• The clutch pressure switch closes when clutch pressure is produced.

• The clutch pressure switch senses clutch pressure abnormalities and turns the 4WD warning lamp ON.

WAIT DETECTION SWITCH

• The wait detection switch operates when there is circulating torque produced in the propeller shaft (L

→H) or

when there is a phase difference between 2-4 sleeve and clutch drum (H

→L). After the release of the circu-

lating torque, the wait detection switch helps provide the 4WD lock gear (clutch drum) shifts. A difference

may occur between the operation of the 4WD shift switch and actual drive mode. At this point, the wait

detection switch senses an actual drive mode.

• The wait detection switch operates as follows.

- 4WD lock gear (clutch drum) locked: ON

- 4WD lock gear (clutch drum) released: OFF

• The wait detection switch senses an actual drive mode and the 4WD shift indicator lamp indicates the vehi-

cle drive mode. 

ATP SWITCH

ATP switch detects if transfer case is in neutral by the position of the L-H shift fork.

NOTE:

Transfer case may be in neutral when shifting between 4H-4LO.

NEUTRAL-4LO SWITCH

The neutral-4LO switch detects that transfer gear is in neutral or 4LO (or shifting from neutral to 4LO) condi-

tion by L-H shift fork position.

Condition

4WD warning lamp

System normal

OFF

Lamp check

Turns ON when ignition switch is turned ON.

Turns OFF after engine start.

4WD system malfunction

ON

During self-diagnosis

Flashes malfunction mode.

Large difference in diameter of front/
rear tires

Flashes slow (1 flash / 2 seconds)

(Continues to flash until the ignition switch is turned OFF)

High fluid temperature in transfer case

Flashes rapidly (2 flashes / 1 second)

(Continues to flash until fluid temperature returns to normal)

 

 

 

 

 

 

 

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