DYNAMIC TORQUE CONTROL AWD SYSTEM AWD Warning Light Remains ON

DESCRIPTION

The 4WD ECU assembly is connected to the combination meter assembly via the CAN communication system.


WIRING DIAGRAM

B0057VTE11

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When the 4WD ECU assembly is replaced with a normal 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. CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND DYNAMIC TORQUE CONTROL AWD SYSTEM)


    1. Check if the CAN communication system DTC is output.

      for LHD: Click here

      for RHD: Click here

    2. Check if the dynamic torque control AWD system DTC is output.

      Click here


      Chassis > Four Wheel Drive > Trouble Codes
      Result
      Result Proceed to
      Neither CAN communication system DTC nor dynamic control AWD system DTC is output A
      CAN communication DTC is output B
      Dynamic torque control AWD system DTC is output C

      Tech Tips

      When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.


    B

    GO TO CAN COMMUNICATION (HOW TO PROCEED WITH TROUBLESHOOTING) for LHD: Click here
    GO TO CAN COMMUNICATION (HOW TO PROCEED WITH TROUBLESHOOTING) for RHD: Click here

    C

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (DYNAMIC TORQUE CONTROL 4WD SYSTEM) Click here

    A

  2. CHECK 4WD ECU ASSEMBLY


    1. Check if the 4WD ECU assembly connector is securely connected.

      OK
      The connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK CHARGING SYSTEM for 3ZR-FAE: Click here
    CHECK CHARGING SYSTEM for 8AR-FTS: Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. B0058OUC49
      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the I55 4WD ECU assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I55-3 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the engine switch off.

    2. B0058OUC50
      *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
      I55-4 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. READ VALUE USING GTS (4WD WARNING LIGHT)


    1. Reconnect the I55 4WD ECU assembly connector.

    2. Turn the engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

    6. Enter the following menus: Chassis / Four Wheel Drive / Data List.

    7. According to the display on the GTS, read the Data List.


      Chassis > Four Wheel Drive > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      4WD Warning Light AWD warning (multi-information display) OFF or ON

      OFF: Warning off

      ON: Warning on

      		 -

      Chassis > Four Wheel Drive > Data List
      Tester Display
      4WD Warning Light

    8. Check the GTS display condition of the 4WD Warning Light.

      Result
      Proceed to
      Display of the Data List remains OFF
      Display of the Data List remains ON

    Display of the Data List remains OFF

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    Display of the Data List remains ON

    REPLACE 4WD ECU ASSEMBLY for LHD: Click here
    REPLACE 4WD ECU ASSEMBLY for RHD: Click here