DYNAMIC TORQUE CONTROL AWD SYSTEM AWD Control Switch Circuit

DESCRIPTION

The 4WD ECU assembly changes the control mode in response to the "Lock Mode" signal from the AWD lock switch (integration control and panel assembly*1 or combination switch assembly*2).

Tech Tips


  • *1: for 8AR-FTS

  • *2: for 2GR-FKS

WIRING DIAGRAM

B005LOYE17
for 8AR-FTS
*1 AWD Lock Switch (Integration Control and Panel Assembly)
*2 4WD ECU Assembly
B005LOYE15

CAUTION / NOTICE / HINT

Note

When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.

Click here

Tech Tips

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE


  1. INSPECT AWD LOCK MODE INDICATOR LIGHT


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. According to the display on the GTS, perform the 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 the combination meter assembly

    7. When performing the 4WD LOCK Light Active Test, check 4WD LOCK 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

      ON: AWD lock mode indicator light on

      		 -

      Chassis > Four Wheel Drive > Active Test
      Active Test Display
      4WD LOCK Light
      Data List Display
      4WD LOCK Light
      Result
      Result Proceed to
      Data List item 4WD LOCK Light changes according to the Active Test (for 8AR-FTS) A
      Data List item 4WD LOCK Light changes according to the Active Test (for 2GR-FKS) B
      Data List item 4WD LOCK Light does not change according to the Active Test C

    B

    INSPECT COMBINATION SWITCH ASSEMBLY Click here

    C

    REPLACE 4WD ECU ASSEMBLY Click here

    A

  2. INSPECT INTEGRATION CONTROL AND PANEL ASSEMBLY


    1. Turn the engine switch off.

    2. Remove the AWD lock switch (integration control and panel assembly).

      Click here

    3. Inspect the AWD lock switch (integration control and panel assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL AND PANEL ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J84-18 (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 (INTEGRATION CONTROL AND PANEL ASSEMBLY - 4WD ECU ASSEMBLY)


    1. Reinstall the AWD lock switch (integration control and panel assembly).

      Click here

    2. Disconnect the R10 4WD ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      R10-10 (4WDS) - Body ground Switch pressed and held Below 100 Ω
      Switch released 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4WD ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT COMBINATION SWITCH ASSEMBLY


    1. Turn the engine switch off.

    2. Remove the AWD lock switch (combination switch assembly).

      Click here

    3. Inspect the AWD lock switch (combination switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J35-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - 4WD ECU ASSEMBLY)


    1. Reinstall the AWD lock switch (combination switch assembly).

      Click here

    2. Disconnect the R10 4WD ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      R10-10 (4WDS) - Body ground Switch pressed and held Below 100 Ω
      Switch released 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE 4WD ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR