Nissan Frontier. Manual - part 277

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4WD SYSTEM

SYSTEM DESCRIPTION

4WD SYSTEM

System Diagram

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COMPONENT DESCRIPTION

ALDIA0423GB

Components

Function

Transfer control unit

Controls transfer control device and controls shifts between 2WD/4WD and 4H/4LO.

Transfer control device

Integrates actuator motor and actuator position switch.

Actuator motor

Moves shift rods when signalled by transfer control unit.

Actuator position switch

Detects actuator motor position.

Wait detection switch

Detects if transfer case is in 4WD.

4LO switch

Detects if transfer case is in 4LO.

ATP switch (A/T models)

Detects if transfer case is in neutral.

4WD shift switch

Allows driver to select from 2WD/4WD and 4H/4LO.

4WD warning lamp

• Illuminates if malfunction is detected in 4WD system.
• Flashes (1 flash / 2 seconds) if rotation difference of front wheels and rear wheels is large.

ATP warning lamp (A/T models)

Indicates that A/T parking mechanism does not operate when A/T selector lever is in “P” position be-
cause transfer case is in neutral.

4WD shift indicator lamp

Displays driving range selected by 4WD shift switch.

4LO indicator lamp

Displays 4LO range.

PNP switch
(M/T models)

Detects if manual transmission is under neutral condition.

ABS actuator and electric unit 
(control unit)

Transmits the following signals via CAN communication to transfer control unit.
• Vehicle speed signal
• Stop lamp switch signal (brake signal)

4WD SYSTEM

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System Description

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TRANSFER CONTROL DEVICE

Integrates actuator motor and actuator position switch.

Actuator Motor

Moves shift rods when signalled by transfer control unit.

Actuator Position Switch

Detects actuator motor position and then sends signal to transfer control unit.

WAIT DETECTION SWITCH

Detects if transfer case is in 4WD by the 2-4 shift fork position.

NOTE:

If 4WD shift switch is switched to 4H or 4LO and the transfer case is not in 4WD completely, the wait detection

system will operate.

4LO SWITCH

4LO switch detects if the transfer case is in 4LO by the position of the L-H shift fork.

ATP SWITCH (A/T MODELS)

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.

PNP SWITCH (M/T models)

PNP switch detects if manual transmission is under neutral condition.

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 RELAYS

Transfer shut off relays 1 and 2 apply power supply to transfer control unit.

4WD SHIFT SWITCH AND INDICATOR LAMP

TCM (A/T models)

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 engine speed signal via CAN communication to transfer control unit.

Combination meter

Receives the following signals via CAN communication from transfer control unit.
• 4WD warning lamp signal
• ATP warning lamp signal (A/T models)
• 4WD shift indicator signal
• 4LO indicator signal

Components

Function

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4WD SYSTEM

4WD Shift Switch

4WD shift switch is able to select from 2WD, 4H or 4LO.

4WD Shift Indicator Lamp

• Displays driving conditions selected by the 4WD shift switch while engine is running. When the 4WD warning

lamp is turned on, all 4WD shift indicator lamps will turn off.

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

ond after the engine starts if system is normal.

4LO Indicator Lamp

• Displays 4LO while engine is running. 4LO indicator lamp flashes if transfer gear does not shift completely

into 4H

⇔4LO. In this condition, the transfer case may be in neutral and the A/T parking mechanism may not

operate.

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

ond after the engine starts if system is normal.

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 for 1

second after the engine starts if system is normal.

4WD Warning Lamp Indication

ATP WARNING LAMP (A/T MODELS)

SDIA3290E

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)

4WD SYSTEM

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

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

Component Parts Location

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1.

Fuse and relay box
A: Transfer shut off relay 1 E156
B: Transfer shift high relay E46
C: Transfer shift low relay E47
D: Transfer shut off relay 2 E157

2.

A: ATP switch F55 (A/T models)
B: 4 LO switch F60
(View with front propeller shaft re-
moved.)

3.

Wait detection switch F59

WDIA0345E