DYNAMIC TORQUE CONTROL AWD SYSTEM TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the 4WD ECU assembly to display a DTC on the multi-information display.

Tech Tips

When each warning light remains blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal short to ground in each ECU is suspected.

WIRING DIAGRAM

B008JIRE23
*a 4WD ECU Assembly
*b CAN Communication Line

CAUTION / NOTICE / HINT

Note

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)


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

      Click here

      Result
      Proceed to
      CAN communication system DTC is not output
      CAN communication system DTC is output

    CAN communication system DTC is output

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

    CAN communication system DTC is not output

  2. INSPECT DLC3


    1. B008I5KC23
      *a Front view of DLC3

      Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I7-13 (TC) - I7-4 (CG) Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TC OF DLC3 - TC OF ECM AND BODY GROUND) Click here

    OK

  3. REPLACE ECM


    1. B008I5KC23
      *a Front view of DLC3

      Replace the ECM.

      for 8AR-FTS: Click here

      for 3ZR-FAE: Click here

    2. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

      SST
      09843-18040

    3. Turn the engine switch on (IG).

    4. Check that the "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed.

      Result
      Result Proceed to
      "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed A
      "DIAG AWD FF" and "DIAG AWD XX (DTC)" are not displayed B

    A

    END

    B

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

  4. CHECK HARNESS AND CONNECTOR (TC OF DLC3 - TC OF ECM AND BODY GROUND)


    1. Turn the engine switch off.

    2. Disconnect the A35 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I7-13 (TC) - A35-33 (TC) Always Below 1 Ω
      I7-13 (TC) or A35-33 (TC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (CG OF DLC3 - BODY GROUND)


    1. Reconnect the A35 ECM connector.

    2. B008I5KC24
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I7-4 (CG) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE ECM


    1. B008I5KC23
      *a Front view of DLC3

      Replace the ECM.

      for 8AR-FTS: Click here

      for 3ZR-FAE: Click here

    2. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

      SST
      09843-18040

    3. Turn the engine switch on (IG).

    4. Check that the "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed.

      Result
      Result Proceed to
      "DIAG AWD FF" or "DIAG AWD XX (DTC)" is displayed A
      "DIAG AWD FF" and "DIAG AWD XX (DTC)" are not displayed B

    A

    END

    B

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