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 Note
C1581 Assist Map Number Un-Writing Assist map not written in power steering ECU assembly

  • CAN communication system

  • Hybrid vehicle control ECU assembly

  • AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)

  • Power steering ECU assembly

 EPS warning light: Comes on -

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing, rotation angle sensor initialization 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 assembly

  • AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)

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
      CAN communication system DTCs are not output. A
      CAN communication system 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 Hybrid vehicle control ECU assembly
      AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)

      Note

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


      • Hybrid vehicle control ECU assembly

        Click here

      • AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)

        Click here

      Result
      Result Proceed to
      All of the related parts have the correct part number. A
      Any of the related parts has an 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 for LHD: Click here
    REPLACE POWER STEERING ECU ASSEMBLY for RHD: 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.


      • Hybrid vehicle control ECU assembly

        Click here

      • AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)

        Click here

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