POWER STEERING SYSTEM TC and CG Terminal Circuit

DESCRIPTION

Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs by blinking the EPS warning light.

WIRING DIAGRAM

B002EKGE04
*a Power Steering ECU Assembly
*b CAN Communication Line

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing, rotation angle sensor initialization and torque sensor zero point calibration.

Click here

Tech Tips

When the warning lights continue to blink, a short to ground in the wiring of terminal TC of the DLC3 or an internal short to ground in one or more ECUs is suspected.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs.

      for RHD: Click here

      for LHD: Click here

      Result
      Result Proceed to
      CAN communication system DTCs are not output. A
      CAN communication system DTCs are output. (for RHD) B
      CAN communication system DTCs are output. (for LHD) C

    B

    GO TO CAN COMMUNICATION Click here

    C

    GO TO CAN COMMUNICATION Click here

    A

  2. INSPECT DLC3


    1. B002ES5C03
      *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
      K16-13 (TC) - K16-4 (CG) Engine switch on (IG) 9 to 16 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM) Click here

    OK

  3. REPLACE ECM


    1. B002ES5C03
      *a Front view of DLC3

      Turn the engine switch off.

    2. Replace the ECM.

      Click here

    3. Using SST, connect terminals TC and CG of the DLC3.

      SST
      09843-18040

      Note

      Connect the terminals properly to avoid a malfunction.

    4. Check that the EPS warning light is blinking.

      OK
      The EPS warning light is blinking.

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part.

      Click here

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)


    1. Disconnect the A12 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K16-13 (TC) - A12-19 (TC) Always Below 1 Ω
      K16-13 (TC) or A12-19 (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. B002D8KC02
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K16-4 (CG) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

    OK

  6. REPLACE ECM


    1. B002ES5C03
      *a Front view of DLC3

      Replace the ECM.

      Click here

    2. Using SST, connect terminals TC and CG of the DLC3.

      SST
      09843-18040

      Note

      Connect the terminals properly to avoid a malfunction.

    3. Check that the EPS warning light is blinking.

      OK
      The EPS warning light is blinking.

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part.

      Click here

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here