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. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
C1581 Assist Map Number Un-Writing Assist map not written in power steering ECU assembly

  • CAN communication system

  • Hybrid vehicle control ECU

  • Main body ECU (Multiplex network body ECU)

  • Skid control ECU (Brake booster with master cylinder assembly)

  • Power steering ECU assembly

 EPS warning light: Comes on Assist Map Writing is performed or the power switch is turned on (IG) again -

CAUTION / NOTICE / HINT

Note

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

Click here

Tech Tips

Related parts store information necessary for assist map writing.

Related Part:


  • Hybrid vehicle control ECU

  • Main body ECU (Multiplex network body ECU)

  • Skid control ECU (Brake booster with master cylinder assembly)

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Perform assist map writing.


      Chassis > EMPS > Utility
      Tester Display
      Signal Check
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.


      Chassis > EMPS > Trouble Codes
      Result
      Result Proceed to
      C1581 is output A
      C1581 is not output B

      Note

      DTC C1581 is cleared after the assist map is written.


    B

    END

    A

  3. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs.

      Tech Tips

      Click here

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  4. CHECK RELATED PART


    1. Confirm if the related part has the correct part number.

      Related Part Hybrid vehicle control ECU
      Main body ECU (Multiplex network body ECU)
      Skid control ECU (Brake booster with master cylinder assembly)

      Note

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


      Result
      Result Proceed to
      The related part has the correct part number. A
      The related part has an incorrect part number. B

    B

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER Click here

    A

  5. CHECK FOR DTC


    1. Select Health Check on the GTS screen and check if system DTCs of the related part are output.

      Tech Tips

      If system DTCs of the related part are stored, assist map writing to the power steering ECU assembly may not be performed properly.

      Result
      Result Proceed to
      System DTCs of the related part are output. A
      System DTCs of the related part are not output. B

    A

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE

    B

    REPLACE POWER STEERING ECU ASSEMBLY for LHD: Click here
    REPLACE POWER STEERING ECU ASSEMBLY for RHD: Click here

  6. REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER


    1. Replace the related part with one that has the correct part number.


      • Hybrid vehicle control ECU

        Tech Tips

        Click here

      • Main body ECU (Multiplex network body ECU)

        Tech Tips

        Click here

      • Skid control ECU (Brake booster with master cylinder assembly)

        Tech Tips

        for LHD: Click here

        for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs.


      Chassis > EMPS > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    A

    END

    B

    REPLACE POWER STEERING ECU ASSEMBLY for LHD: Click here
    REPLACE POWER STEERING ECU ASSEMBLY for RHD: Click here