4WD System System Description

4WD System: System Description

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





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 second 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 second 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)

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.