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

DESCRIPTION

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


WIRING DIAGRAM

B002AETE04

CAUTION / NOTICE / HINT

Note

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

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 4WD/AWD SYSTEM)


    1. Check if CAN communication system DTCs are output.

      for LHD with Central Gateway ECU: Click here

      for RHD with Central Gateway ECU: Click here

      for LHD without Central Gateway ECU: Click here

      for RHD without Central Gateway ECU: 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 with Central Gateway ECU) B
      CAN communication DTC is output (for RHD with Central Gateway ECU) C
      CAN communication DTC is output (for LHD without Central Gateway ECU) D
      CAN communication DTC is output (for RHD without Central Gateway ECU) E
      Dynamic torque control 4WD/AWD system DTC is output F

      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 SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    E

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    F

    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. B002AOGC06
      *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. B002AOGC07
      *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

      4WD/AWD warning (multi-information display)*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 TFT 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