4WD Change-Over Electric Control Inspection
INSPECTION OF ELECTRIC CONTROL COMPONENTSElectric Control Circuit Diagram:
1. INSPECT FOUR-WHEEL DRIVE CHANGE-OVER ELECTRIC SYSTEM
a. Turn on the ignition switch.
b. Turn on the 4WD change-over switch.
c. At this time confirm that there is an operation sound from the 4WD change-over solenoid.
If there is no sound, check the 4WD change-over switch, solenoid and circuit.
2. INSPECT FOUR-WHEEL DRIVE CHANGE-OVER SWITCH
a. Disconnect the 4WD change-over switch connector.
b. Using an ohmmeter, check the continuity of the terminals for each switch position.
c. Connect the 4WD change-over switch connector.
3. INSPECT FOUR-WHEEL DRIVE CHANGE-OVER SOLENOID
a. Disconnect the solenoid connector. Using an ohmmeter, measure the solenoid coil resistance between terminal 2 and 3.
Resistance: 13 Ohm
b. Connect the battery positive (+) lead to terminal 3 and the negative lead to terminal 2 , and check for a solenoid operation sound.
c. Remove the solenoid valve and place a Mighty-Vac hose over solenoid valve hole. Apply vacuum and check for leaks.
d. Install the solenoid.
4. INSPECT WATER THERMO SWITCH
a. Remove the water thermo switch.
b. Using an ohmmeter, measure the resistance between the terminal and ground.
c. Install the thermo switch.
5. INSPECT OIL TEMPERATURE SWITCH
a. Remove the oil temperature switch.
b. Using an ohmmeter, measure the resistance between the terminal and ground.
c. Install the oil temperature switch.
TROUBLESHOOTING OF ELECTRIC CONTROL
Trouble 1. No 4WD change-over
Part 1:
Part 2:
Trouble 2. No return to front-wheel drive
NOTE: During acceleration, etc. when drive force is applied to the drive axis, there will be no immediate change-over to front-wheel drive even when the switch is turned off.