P1839

P1839 Position Switch On

Description

The differential lock position switch sends a signal to the differential lock control unit when the differential lock is engaged. The differential lock control unit monitors the left and right rear wheel speed sensor signals to determine wheel slippage. When the differential lock is engaged the left and right rear wheel speed sensor signals should match.

DTC Logic






Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Differential Lock Control Unit: Wiring Diagram] [1][2]Differential Lock.

1. CHECK DIFFERENTIAL LOCK POSITION SWITCH SIGNAL

1 Start engine.
2 Using SDT, select "D-LOCK POS SW SIG" of "Diff Lock" data list.
3 Activate the differential lock according to the directions listed in the table and monitor the display value.






Is the inspection result normal?
YES
Differential lock position switch is operating normally.
NO
GO TO 2.

2. CHECK DIFFERENTIAL LOCK POSITION SWITCH

1 Disconnect differential lock position switch harness connector.





2 Turn ignition switch ON.
3 Select "D-LOCK POS SW SIG" of "Diff Lock" data list.
4 Monitor the display value while connecting and disconnecting a jumper wire between differential lock position switch harness connector C116 terminals 1 and 3.






Is the inspection result normal?
YES
Check the mechanical operation of the differential lock. Replace the differential lock position switch. Refer to [Differential Lock Position Switch: Removal and Installation] Service and Repair.
NO
GO TO 3.

3. CHECK DIFFERENTIAL LOCK POSITION SWITCH VOLTAGE

Check voltage between differential lock position switch harness connector C116 terminal 3 and ground.











Is the inspection result normal?
YES
GO TO 4.
NO
GO TO 5.

4. CHECK GROUND CIRCUIT

1 Turn ignition switch OFF.





2 Check continuity between differential lock position switch harness connector C116 terminal 1 and ground.






Is the inspection result normal?
YES
Replace the differential lock control unit. Refer to [Differential Lock Control Unit: Removal and Installation] Service and Repair.
NO
Repair harness or connector.

5. 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 M70 (A) terminal 20 and differential lock position switch harness connector C116 (B) terminal 3.






4 Check continuity between differential lock control unit harness connector M70 (A) terminal 20 and ground.






Is the inspection result normal?
YES
Replace differential lock control unit. Refer to [Differential Lock Control Unit: Removal and Installation] Service and Repair.
NO
Repair harness or connector.