DIFFERENTIAL SYSTEM INSPECTION


  1. INSPECT DIFFERENTIAL LOCK SYSTEM

    A01DU9U

    1. Inspect the indicator light.


      1. Check that the indicator light lights up approximately 1 second after the ignition switch is turned to ON.

    2. Inspect the differential lock operation.


      1. Jack up the vehicle and start the engine.

      2. Set the transfer to L4 or L4L.

      3. When the differential lock control switch is set to the ON position, check that the indicator light turns on. Differential lock is applied to the rear wheels at this time.

        Tech Tips

        If the gears of the differential lock system are not engaged, the indicator light continues blinking, so rotate the tires to engage the gears.

      4. When the differential lock control switch is in the OFF position, check that the indicator light goes off. The rear differential lock is released at this time.

      5. Stop the engine and lower the vehicle.

  2. INSPECT FOUR WHEEL DRIVE CONTROL ECU (POWER SUPPLY)

    A01DOEME24
    Text in Illustration
    *a

    Component with harness connected

    (Four Wheel Drive Control ECU)

    1. Check the harness and connector (ECU - battery and body ground).


      1. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G54-3 (IG) - Body ground Ignition switch ON 11 to 14 V

        If the result is not as specified, inspect the harness and connector or 4WD fuse. If the harness is malfunctioning, repair or replace the harness and connector or 4WD fuse. If the harness and connector are normal, replace the four wheel drive control ECU Click here.

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        G54-4 (GND) - Body ground Always Below 1 Ω

        If the result is not as specified, repair or replace the harness or connector.

  3. INSPECT CENTER CLUSTER MODULE SWITCH (REAR DIFFERENTIAL LOCK CONTROL SWITCH)


    1. Check the harness and connector (center cluster module switch (rear differential lock control switch) - ECU).


      1. Disconnect the G53 ECU connector.

      2. Disconnect the G156 switch connector.

      3. Measure the resistance according to the value(s) in the table below.

        A01DTMKE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to center cluster module switch (rear differential lock control switch))

        		 *b

        Front view of wire harness connector

        (to Four Wheel Drive Control ECU)
        Standard Resistance
        Tester Connection Condition Specified Condition
        G156-15 (B) - G53-3 (R) Always Below 1 Ω
        G156-24 (E) - Body ground Always Below 1 Ω
        G156-24 (E) - G53-3 (R) Always 100 kΩ or higher

        If the result is not as specified, repair or replace the harness or connector.

    2. Check the center cluster module switch (rear differential lock control switch).


      1. Turn the ignition switch to ON.

      2. Connect the G156 switch connector.

      3. Connect the G53 ECU connector.

      4. A01DOEME26
        Text in Illustration
        *a

        Component with harness connected

        (Four Wheel Drive Control ECU)

        Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G53-3 (R) - Body ground center cluster module switch (rear differential lock control switch) on Below 1.5 V
        center cluster module switch (rear differential lock control switch) off 11 to 14 V

  4. INSPECT REAR DIFFERENTIAL LOCK SHIFT ACTUATOR


    1. Check the harness and connector (rear differential lock actuator - ECU).


      1. Disconnect the E1 differential lock actuator connector.

      2. Disconnect the G53 and G54 ECU connectors.

      3. Measure the resistance according to the value(s) in the table below.

        A01DOD0E04
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Four Wheel Drive Control ECU)

        		 *b

        Front view of wire harness connector

        (to Differential Lock Shift Actuator)
        Standard Resistance
        Tester Connection Condition Specified Condition
        G53-10 (RLY2) - E1-5 (RLY2) Always Below 1 Ω
        G53-10 (RLY2) - Body ground Always 100 kΩ or higher
        G53-9 (RLY1) - E1-6 (RLY1) Always Below 1 Ω
        G53-9 (RLY1) - Body ground Always 100 kΩ or higher
        G54-5 (M2) - E1-2 (M2) Always Below 1 Ω
        G54-5 (M2) - Body ground Always 100 kΩ or higher
        G54-1 (M1) - E1-3 (M1) Always Below 1 Ω
        G54-1 (M1) - Body Ground Always 100 kΩ or higher
        E1-4 (GND2) - Body Ground Always Below 1 Ω

    2. Check the free to lock switch.


      1. Connect lines via a relay as shown in the illustration and check that the actuator fork moves from the free to the lock position.

        Note


        • Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.

        • When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

        Tech Tips

        When performing the operation described above, use the DEF relay.

        A01DNXKE09
        Text in Illustration
        *1 DEF Relay - -
        *a

        Front view of wire harness connector

        (to Differential Lock Shift Actuator)

        		 - -

      2. After the free to lock switch is complete, check the limit switch.

        Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        5 (RLY2) - 4 (GND2) After free to lock switch is complete Below 12.5 Ω
        6 (RLY1) - 4 (GND2) After free to lock switch is complete 500 kΩ or higher

        If the result is not as specified, replace the differential lock shift actuator assembly.

    3. Check the lock to free switch.


      1. Connect lines via a relay as shown in the illustration and check that the actuator fork moves from the lock to the free position.

        Note


        • Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.

        • When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.

        Tech Tips

        When performing the operation described above, use the DEF relay.

        A01DRSAE04
        Text in Illustration
        *1 DEF Relay - -
        *a

        Front view of wire harness connector

        (to Differential Lock Shift Actuator)

        		 - -

      2. After the lock to free switch is complete, check the limit switch.

        Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        5 (RLY2) - 4 (GND2) After lock to free switch is complete 500 kΩ or higher
        6 (RLY1) - 4 (GND2) After lock to free switch is complete Below 12.5 Ω

        If the result is not as specified, replace the differential lock shift actuator assembly.

  5. INSPECT DIFFERENTIAL LOCK POSITION SWITCH


    1. Inspect the rear differential lock position switch.


      1. Remove the rear differential lock position switch Click here.

      2. A01DTIHE06
        Text in Illustration
        *a

        Component without harness connected

        (Rear Differential Lock Position Switch)
        *b Pushed
        *c Released

        Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        2 (+B) - 1 (GND) Pushed Below 1 Ω
        Released 100 kΩ or higher

        If the result is not as specified, replace the rear differential lock position switch.

    2. Check the harness and connector (ECU - differential lock position switch).


      1. Disconnect the E2 differential lock position switch connector.

      2. Disconnect the G53 ECU connector.

      3. Measure the resistance according to the value(s) in the table below.

        A01DOPLE02
        Text in Illustration
        *a

        Component without harness connected

        (Rear Differential Lock Position Switch)

        		 *b

        Component without harness connected

        (Four Wheel Drive Control ECU)
        Standard Resistance
        Tester Connection Condition Specified Condition
        G53-15 (RLP) - E2-2 (+B) Always Below 1 Ω
        G53-15 (RLP) - Body ground Always 100 kΩ or higher
        E2-1 (GND) - Body ground Always Below 1 Ω

        If the result is not as specified, repair or replace the harness or connector.