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

  • ECM

  • Main body ECU (Multiplex network body ECU)

  • Skid control ECU (Brake actuator 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

Tip:

The related parts store information necessary for assist map writing.

Related Part:

  • ECM

  • Main body ECU (Multiplex network body ECU)

  • Skid control ECU (Brake actuator 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.

      w/ Central Gateway ECU:Click here

      w/o Central Gateway ECU:Click here

    Result

    Result

    Proceed to

    DTCs are not output.

    A

    DTCs are output.

    B
    B

    GO TO CAN COMMUNICATION SYSTEM

    w/ Central Gateway ECU:Click here

    w/o Central Gateway ECU:Click here

    A

  3. CHECK RELATED PART

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

      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.

      Result

      Result

      Proceed to

      All installed related parts have correct part number.

      A

      Part with incorrect part number is installed.

      B
    B

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBERClick 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.

      Tip:

      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