DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM 4WD Warning Light Remains ON

DTC Code DTC Name
4WD Warning Light Remains ON

DESCRIPTION

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

  • for Segment Display Type:

    If the 4WD ECU assembly stores any DTCs which are related to the dynamic torque control 4WD/AWD system , the 4WD/AWD warning light comes on in the combination meter assembly.

  • for Dot Display Type:

    If the 4WD ECU assembly stores any DTCs which are related to the dynamic torque control AWD system , the master warning light comes on and the warning message is displayed on the multi-information display in the combination meter assembly.

WIRING DIAGRAM

C278461E03

CAUTION / NOTICE / HINT

Note:

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

Tip:

Check the condition of each related circuit connector before troubleshooting.

Click here

PROCEDURE

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM)

    1. Check if CAN communication system DTCs are output.

      for LHD:Click here

      for RHD:Click here

    2. Check if the dynamic torque control 4WD/AWD system DTC is output.

      Click here

      Chassis > Four Wheel Drive > Trouble Codes

    Result

    Result

    Proceed to

    Neither CAN communication system DTC nor dynamic torque control 4WD/AWD system DTC is output

    A

    CAN communication DTC is output (for LHD)

    B

    CAN communication DTC is output (for RHD)

    C

    Dynamic torque control 4WD/AWD system DTC is output

    D
    Tip:

    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)

    Click here

    C

    GO TO CAN COMMUNICATION (HOW TO PROCEED WITH TROUBLESHOOTING)

    Click here

    D

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (DYNAMIC TORQUE CONTROL 4WD/AWD SYSTEM)

    Click here

    A

  2. CHECK IF 4WD ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

    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 (for 2AR-FE)

    NG (for 2AD-FHV)

    NG (for 2AD-FTV)

    NG (for 3ZR-FAE)

    NG (for 3ZR-FE)
    NG (for 2AR-FE)

    CHECK CHARGING SYSTEM

    Click here

    NG (for 2AD-FHV)

    CHECK CHARGING SYSTEM

    Click here

    NG (for 2AD-FTV)

    CHECK CHARGING SYSTEM

    Click here

    NG (for 3ZR-FAE)

    CHECK CHARGING SYSTEM

    Click here

    NG (for 3ZR-FE)

    CHECK CHARGING SYSTEM

    Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

    1. C270074C06

      *a

      Front view of wire harness connector

      (to 4WD ECU Assembly)

      Disconnect the 4WD ECU assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G86-3 (IG1) - Body ground

      Ignition switch ON

      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 ignition switch off.

    2. C270074C07

      *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

      G86-4 (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. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS the DLC3.

    4. Turn the ignition switch to ON.

    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

      4WD/AWD warning Light*1

      AWD warning*2

      OFF or ON

      OFF: Warning light off*1

      OFF: Warning off*2

      ON: Warning light on*1

      ON: Warning on*2

      -

      • *1: for Segment Display Type

      • *2: for Dot Display Type

      Chassis > Four Wheel Drive > Data List

      Tester Display

      4WD Warning Light

    8. Check the GTS diplay condition of the 4WD/AWD 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

    Click here