Power Supply Circuit For Differential Lock Control Unit

Power Supply Circuit For Differential Lock Control Unit

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE:

DIFFERENTIAL LOCK CONTROL UNIT TERMINALS AND REFERENCE VALUE:

DIAGNOSTIC 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. 15 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. Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT". Power Supply Routing Circuit Schematic

2. CHECK GROUND CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect differential lock control unit harness connector.





3. Check continuity between differential lock control unit harness connector B77 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. Refer to RFD-49, "Differential Lock Control Unit Input/Output Signal Reference Values". Pinout Values and Diagnostic Parameters
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.