POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 Assist Map Number Un-Writing

DESCRIPTION

This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU.

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

  • Main body ECU (multiplex network body ECU)

  • Brake actuator assembly (skid control ECU)

  • Power steering ECU assembly

INSPECTION PROCEDURE

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing and torque sensor zero point calibration Click here.

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Perform assist map writing Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1581 is output A
      DTC C1581 is not output B

      Tech Tips

      DTC C1581 is cleared after the assist map is written.


    B

    END

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK RELATED PART (ECM, MAIN BODY ECU AND SKID CONTROL ECU)


    1. Check if any of the parts listed below have been replaced with an incorrect part in the past.

      Related Part ECM
      Main body ECU (multiplex network body ECU)
      Brake actuator assembly (skid control ECU)

      Note

      When removing a related part to check it, be sure to follow the appropriate procedures and precautions.


      • Refer to the following procedures to remove the ECM (for 2AR-FE) Click here.

      • Refer to the following procedures to remove the ECM (for 2GR-FE) Click here.

      • Refer to the following procedures to remove the ECM (for 1AZ-FE) Click here.

      • Refer to the following procedures to remove the Main body ECU (multiplex network body ECU) Click here.

      • Refer to the following procedures to remove the brake actuator assembly (skid control ECU) Click here.

      Tech Tips


      • DTC C1581 is stored when a part with an incorrect part number is installed for the related parts listed above.

      • When DTC C1581 is output when parts have not been exchanged, replace the power steering ECU assembly as it may have an internal malfunction.

      Result

      Result

      Proceed to
      All installed related parts have correct part number A
      Part with incorrect part number is installed B

    B

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here