DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM AWD Control Switch Circuit

DESCRIPTION

The 4WD ECU assembly changes the control mode in response to "Auto Mode" and "Lock Mode" signals from the AWD lock switch (differential lock switch).

WIRING DIAGRAM

A018GUEE11
*1 AWD Lock Switch (Differential Lock Switch)
*2 4WD ECU Assembly

CAUTION / NOTICE / HINT

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. INSPECT 4WD LOCK LIGHT


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Four Wheel Drive / Active Test


      Chassis > Four Wheel Drive > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      4WD LOCK Light AWD lock mode indicator light Indicator light OFF/ON Observe combination meter assembly

      Chassis > Four Wheel Drive > Active Test
      Tester Display
      4WD LOCK Light

    6. When performing the 4WD Warning Light Active Test, check 4WD Warning Light in the Data List.


      Chassis > Four Wheel Drive > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      4WD LOCK Light AWD lock mode indicator light OFF or ON

      OFF: AWD lock mode indicator light off

      OFF: AWD lock mode indicator light on

      		 -

      Chassis > Four Wheel Drive > Data List
      Tester Display
      4WD LOCK Light
      Result
      Result Proceed to
      Changes between ON and OFF A
      Does not change between ON and OFF B

    B

    REPLACE 4WD ECU ASSEMBLY Click here

    A

  2. INSPECT DIFFERENTIAL LOCK SWITCH


    1. Remove the AWD lock switch (differential lock switch).

      Click here

    2. Inspect the AWD lock switch (differential lock switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DIFFERENTIAL LOCK SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (DIFFERENTIAL LOCK SWITCH - BODY GROUND)


    1. A018IH2C03
      *a

      Front view of wire harness connector

      (to AWD Lock Switch (Differential Lock Switch))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F56-6 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (DIFFERENTIAL LOCK SWITCH - 4WD ECU ASSEMBLY)


    1. Reinstall the AWD lock switch (differential lock switch).

      Click here

    2. Disconnect the F14 4WD ECU assembly connector.

    3. A018L1NC31
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F14-10 (4WDL) - Body ground AWD lock switch on Below 1 Ω
      AWD lock switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4WD ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR