P1839

Differential Lock Position Switch

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE:

DIFFERENTIAL CONTROL UNIT TERMINALS AND REFERENCE VALUE:

DIAGNOSTIC PROCEDURE

1. CHECK DIFFERENTIAL LOCK POSITION SWITCH SIGNAL

With CONSULT-II
1. Start engine.
2. Select "DATA MONITOR" mode for "DIFF LOCK" with CONSULT-II.








3. Read out ON/OFF switching action of "D-LOCK POS SW SIG".

Without CONSULT-II
1. Start engine.








2. Check voltage between differential lock control unit harness connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.

2. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect differential lock position switch harness connector.





3. Check continuity between differential lock position switch harness connector C16 terminal 3 and ground.
Continuity should exist.
Also check harness for short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to power in harness or connectors.

3. CHECK DIFFERENTIAL LOCK POSITION SWITCH

With CONSULT-II
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode for "DIFF LOCK" with CONSULT-II.








3. Read out ON/OFF switching action of "D-LOCK POS SW SIG" while connecting and disconnecting jumper wire between differential lock position switch harness connector C16 terminals 1 and 3.

Without CONSULT-II
1. Turn ignition switch ON.








2. Check voltage between differential lock control unit harness connector B77 terminal 20 and ground while connecting and disconnecting jumper wire between differential lock position switch harness connector C16 terminals 1 and 3.
OK or NG
OK >> Replace differential lock position switch.
NG >> GO TO 4.

4. CHECK HARNESS BETWEEN DIFFERENTIAL LOCK CONTROL UNIT AND DIFFERENTIAL LOCK POSITION SWITCH
1. Turn ignition switch OFF.
2. Disconnect differential lock control unit harness connector.





3. Check continuity between differential lock control unit harness connector B77 terminal 20 and differential lock position switch harness connector C16 terminal 1.
Continuity should exist.
Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.

5. 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 6.
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.

6. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> INSPECTION END
NG >> Replace differential lock control unit.