Power Supply Circuit For Differential Lock Control Unit
Power Supply Circuit For Differential Lock Control UnitDIAGNOSTIC PROCEDURE
1. CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect differential lock control unit harness connector.
3. Check voltage between differential lock control unit harness connector terminals and ground.
4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between differential lock control unit harness connector terminals and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
^ 10A fuse [No. 3 or 19, located in fuse block (J/B)]
^ Harness for short or open between battery and differential lock control unit harness connector terminal 15
^ Harness for short or open between ignition switch and differential lock control unit harness connector terminals 1 and 2
^ Battery and ignition switch.
2. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between differential lock control unit harness connector M70 terminals 3, 10 and ground.
Continuity should exist.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK DIFFERENTIAL LOCK CONTROL UNIT
Check differential lock control unit input/output signal.
OK or NG
OK >> GO TO 4.
NG >> Check differential lock control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
4. CHECK DTC
Perform the self-diagnosis, after driving the vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace differential lock control unit.