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 No. DTC Detection Condition Trouble Area
C1581 Assist map not written in power steering ECU assembly

  • CAN communication system

  • Incorrect hybrid vehicle control ECU

  • Power steering ECU assembly

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced with a new one, perform assist map writing and the 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

      Note

      DTC C1581 is cleared after the assist map is written.


    B

    END

    A

  2. CHECK CAN COMMUNICATION SYSTEM


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


      Result
      Result Proceed to
      DTC is not output A
      DTC is output (w/o Toyota Safety Sense) B
      DTC is output (w/ Toyota Safety Sense) C

    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

    A

  3. CHECK RELATED PART (HYBRID VEHICLE CONTROL ECU)


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

      Related Part Hybrid vehicle 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 hybrid vehicle 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 (for LHD) A
      All installed related parts have correct part number (for RHD) B
      Part with incorrect part number is installed C

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER