Tacoma Extra Cab 4WD L4-2693cc 2.7L DOHC MFI (1997)
Switch: Testing and Inspection
1. Inspect relay operation.
a. Jack up the vehicle.
b. Use a heater main relay and connect it, as shown below.
c. Rotate the tire and check that differential lock has occurred. if operation is not as specified, replace the actuator.
2. Inspect Diff. Lock control switch continuity. Inspect the switch continuity between terminal 1 to terminal 4.
HINT: If it is not continuity, replace the switch.
3. Inspect Diff. Lock position switch.
a. Check that there is continuity between terminals when the switch is pushed (differential connected position).
b. Check that there is no continuity when the switch is free (differential disconnected position).
HINT: If operation is not as specified, replace the switch.
4. Inspect transfer 4WD switch.
5. Inspect vehicle speed sensor.
