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

  • Power management 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 written -

CAUTION / NOTICE / HINT

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

Tech Tips

Related parts store information necessary for assist map writing.

Related Part:


  • Power management 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.

      Click here


      Chassis > EMPS > Utility
      Tester Display
      Signal Check

    2. Check for DTCs.

      Click here


      Chassis > EMPS > Trouble Codes
      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 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


    1. Confirm if the related parts have the correct part number.

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

      Note

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


      Result
      Result Proceed to
      All of the related parts have the correct part number. A
      Any of the related parts has the incorrect part number. B

    B

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

    A

  4. CHECK FOR DTC


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

      Tech Tips

      If system DTCs of the related parts 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 parts are output. A
      System DTCs of the related parts are not output. B

    A

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

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


    1. Replace the related parts with ones that have the correct part number.


      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      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 Click here