POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU stores this DTC when it determines that the assist map is not written in the ECU.

Tech Tips

The assist map is data written in the power steering ECU assembly to control the degree of power assist. The assist map is selected based on the vehicle's specified communication data.

DTC Code DTC Detection Condition Trouble Area
C1581 The assist map is not written in the power steering ECU.

  • assist map not written

  • CAN communication system

  • ECM

  • Power steering ECU assembly

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly is replaced with a new one, perform rotation angle sensor initialization and torque sensor zero point calibration Click here.

PROCEDURE


  1. INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT


    1. Initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.

      Tech Tips

      The assist map is automatically written during the rotation angle sensor initialization and torque sensor zero point calibration.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC C1581 is not output.

      Tech Tips

      DTC C1581 is cleared after the assist map is written.


    OK

    END

    NG

  3. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system Click here.

      OK
      DTC is not output.

    NG

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

    OK

  4. CHECK ENGINE TYPE


    1. Check the engine type.

      Result
      Result Proceed to
      1AD-FTV A
      2AD-FTV B
      2AD-FHV C

    B

    CHECK ECM Click here

    C

    CHECK ECM Click here

    A

  5. CHECK ECM


    1. Check if an ECM that complies with the vehicle specifications is installed.

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

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE ECM Click here

  6. CHECK ECM


    1. Check if an ECM that complies with the vehicle specifications is installed.

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

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE ECM Click here

  7. CHECK ECM


    1. Check if an ECM that complies with the vehicle specifications is installed.

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

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE ECM Click here