Differential Lock Solenoid

DIFFERENTIAL LOCK SOLENOID

Description
When power and ground is supplied from the differential lock control unit, the differential lock solenoid will actuate to move the pressure plate against the cam ring to lock the differential. By reversing polarity at the differential lock control unit, the differential lock solenoid moves the pressure plate away from the cam ring to unlock the differential.

Component Function Check

1. CHECK DIFFERENTIAL SOLENOID CONTROL
1. Start engine.
2. Select "RELAY ON", "RELAY MTR", "SOL MTR" of DIFF LOCK data monitor.
3. Observe the display values while operating the differential lock system.





Are the display values as specified?
YES >> Differential lock solenoid control system is operating normally
NO >> Check the differential lock solenoid control circuit. Refer to "Diagnosis Procedure".

Diagnosis Procedure

DIAGNOSTIC PROCEDURE

1. CHECK DIFFERENTIAL LOCK SOLENOID RESISTANCE





1. Turn ignition switch OFF.
2. Disconnect differential lock solenoid harness connector C17.
3. Check resistance between differential lock solenoid terminals 2 and 4.
2-4: Approx. 3.4 Ohms
Is continuity as specified?
YES >> GO TO 2.
NO >> Replace differential solenoid.

2. CHECK DIFFERENTIAL LOCK SOLENOID OPERATION








Check operation by applying power and ground to the differential lock solenoid terminals.
Does the differential lock solenoid operate?
YES >> GO TO 3.
NO >> Check for a mechanical malfunction with the differential lock system. Replace differential solenoid.

3. CHECK DIFFERENTIAL LOCK SOLENOID CIRCUIT








1. Disconnect differential lock control unit harness connector B77.
2. Check continuity between differential lock control unit harness connector B77 (A) and differential lock solenoid harness connector C17 (B).
3. Check continuity between differential lock control unit harness connector B77 (A) and ground.





Are continuity test results as specified?
YES >> Replace the differential lock control unit.
NG >> Repair harness or connector.