System Description

SYSTEM

4WD SYSTEM : System Description

- In AUTO mode, distribution of traction force is controlled from 2WD status (0:100) to 4WD status (50:50)
according to signal from each sensor and switch.
- In accordance with fail-safe function, when system is malfunctioning, 4WD warning lamp on combination meter turns ON and 4WD control stops. For fail-safe function, refer to "4WD SYSTEM : Fail-Safe" Fail Safe.
- When a high load status continues for transfer assembly (transfer control actuator or transfer fluid), 4WD
control temporarily becomes 4H or 2WD status, according to protection function.
NOTE:
4WD system is not malfunctioning.

SYSTEM DIAGRAM







INPUT/OUTPUT SIGNAL

It transmits/receives each signal from the following transfer control unit via CAN communication line.






4WD SHIFT SWITCH AND 4WD SHIFT INDICATOR LAMP






*1: Blinking 2 times/1 second
*2: "4HI" and "4LO" blink alternately.

CONDITION FOR TURN ON THE WARNING LAMP

4WD Warning Lamp
- Turns ON when there is a malfunction in 4WD system. 4WD warning lamp indicates the vehicle is in fail-safe mode.
- Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF approximately for 1 second after the engine starts if system is normal.





ATP Warning Lamp
When the A/T shift selector is in P position, the vehicle may move if the transfer case in neutral. ATP warning lamp is turned on to indicate this condition to the driver.

CONDITION FOR OPERATE WARNING BUZZER

For preventing an incorrect operation during 4H to/from 4L switching, warning buzzer sounds from inside of transfer control unit and warns the driver, when certain conditions are satisfied.