POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU assembly outputs this DTC when it 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

  • Power steering ECU assembly

  • CAN communication system

  • ECM

CAUTION / NOTICE / HINT

Note


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

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Perform assist map writing Click here.


    NEXT

  2. CONFIRM DTC


    1. Check for DTCs Click here.

      OK
      DTC C1581 is not output.

      Tech Tips

      DTC C1581 will be cleared after the assist map is written.


    OK

    END

    NG

  3. CHECK CAN COMMUNICATION SYSTEM


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


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

  4. CHECK ECM


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

      OK
      The ECM that complies with vehicle specifications is installed.
      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 2NR-FKE) C
      NG (for 1ND-TV without DPF) D
      NG (for 1ND-TV with DPF) E

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here

    A

  5. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here