POWER STEERING SYSTEM, Diagnostic DTC:C1581/26

DTC Code DTC Name
C1581/26 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
C1581/26 Assist Map Number Un-Writing Assist map not written in power steering ECU assembly

  • CAN communication system

  • SFI system

  • Brake control system

  • Main body ECU (multiplex network body ECU)

  • Power steering ECU assembly

 On Assist map written

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly has been replaced, perform assist map writing Click here.

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Perform the assist map writing.

      Click here


      Chassis > EMPS > Utility
      Tester Display
      Signal Check

    2. Check for DTCs.

      Click here


      Chassis > EMPS > Trouble Codes
      Result
      Proceed to
      DTC C1581/26 is output.
      DTC C1581/26 is not output.

      Note

      DTC C1581/26 is cleared after the assist map is written.


    DTC C1581/26 is not output.

    END

    DTC C1581/26 is output.

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs.

      Click here


      Chassis > EMPS > Trouble Codes
      Result
      Proceed to
      DTCs is not output
      DTCs is output

    DTCs is output

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) for RHD: Click here

    DTCs is not output

  3. CHECK RELATED PART (ECM, MAIN BODY ECU AND SKID CONTROL ECU)


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

      Related Part ECM
      Main body ECU (multiplex network body ECU)
      Skid control ECU (brake actuator assembly)

      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 ECM (for 1AD-FTV).

        Click here

      • Refer to the following procedures to remove the ECM (for 2AD-FHV).

        Click here

      • Refer to the following procedures to remove the ECM (for 2AD-FTV).

        Click here

      • Refer to the following procedures to remove the ECM (for 2AR-FE).

        Click here

      • Refer to the following procedures to remove the ECM (for 3ZR-FAE).

        Click here

      • Refer to the following procedures to remove the ECM (for 3ZR-FE).

        Click here

      • Refer to the following procedures to remove the main body ECU (multiplex network body ECU) (for LHD).

        Click here

      • Refer to the following procedures to remove the main body ECU (multiplex network body ECU) (for RHD).

        Click here

      • Refer to the following procedures to remove the skid control ECU (brake actuator assembly) (w/ VSC).

        Click here

      • Refer to the following procedures to remove the skid control ECU (brake actuator assembly) (w/o VSC).

        Click here

      Tech Tips


      • DTC C1581/26 is stored when a part with an incorrect part number is installed for the related parts listed above.

      • When DTC C1581/26 is output when parts have not been exchanged, replace the power steering ECU assembly as it may have an internal malfunction.

      Result
      Proceed to
      All installed related parts have correct part number
      Part with incorrect part number is installed

    All installed related parts have correct part number

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    Part with incorrect part number is installed

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER