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

  • Skid control ECU (Brake actuator assembly)

  • ECM

  • 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, perform assist map writing and torque sensor zero point calibration.

Click here

Tip:

Related parts store information necessary for assist map writing.

Related Part:

  • Skid control ECU (Brake actuator assembly)

  • ECM

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 hereClick 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 hereClick here

    A

  3. CHECK RELATED PART

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

      Related Part

      Skid control ECU (Brake actuator assembly)

      ECM
      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 NUMBERClick here

    A

  4. CHECK FOR DTC

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

      Tip:

      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

    Click here

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

    1. Replace the related part with one that has 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