System Description
System DescriptionTRANSFER CONTROL DEVICE
Actuator motor and actuator position switch are integrated. Transfer control device shifts from 4H-4LO and between 2WD-4WD.
Actuator Motor
Actuator motor is operated by signal from transfer control unit and it operates control shift rod so as to shift from 4H-4LO and between 2WD-4WD.
Actuator Position Switch
Actuator position switch detects actuator motor position and sends it to transfer control unit.
WAIT DETECTION SWITCH
Wait detection switch detects if transfer gear is in 4WD by 2-4 shift fork position.
NOTE: If 4WD shift switch is switched to 4H or 4LO, transfer is not in 4WD completely when gear does not engage. (Wait detection system is operating.)
4LO SWITCH
4LO switch detects if transfer gear is under 4LO condition by L-H shift fork position.
ATP SWITCH (A/T MODELS)
ATP switch detects if transfer gear is under neutral condition by L-H shift fork position.
NOTE: Transfer gear may be under neutral condition 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 by input signals of each sensor and each switch, 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
4WD shift switch is able to select from 2WD, 4H or 4LO.
4WD Shift Indicator Lamp
^ Displays driving conditions selected by 4WD shift switch with front, rear and center indicators, while engine is running. When shifting from 4H to 4LO, 4LO indicator lamp also turns on. And when 4WD warning lamp is turned on, all 4WD shift indicator lamps are turned off.
^ Turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately 1 second after the engine starts if system is normal.
4LO Indicator Lamp
^ Displays 4LO condition while engine is running and 4WD shift switch is in 4LO. 4LO indicator lamp flashes if transfer gear does not shift completely under 4H<->4LO. In this condition, transfer may be under neutral condition and A/T parking mechanism may not operate.
^ Turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately 1 second after the engine starts if system is normal.
4WD WARNING LAMP
Turns ON or FLASH 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.
NOTE: 4WD warning lamp is turned on when one or more of the following parts are malfunctioning.
^ Vehicle speed signal [from ABS actuator and electric unit (control unit)]
^ CAN communication line
^ AD converter
^ Engine speed signal
^ 4WD shift switch
^ Wait detection switch
^ Actuator motor
^ Transfer control device
^ Transfer shut off relays
^ Transfer shift high and low relays
^ PNP switch signal
ATP WARNING LAMP (FOR A/T MODELS)
When A/T selector lever is in "P" position, vehicle may move because A/T parking mechanism does not operate when transfer is under neutral condition. ATP warning lamp is turned on to indicate this condition to the driver.