POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU assembly outputs this DTC when it determines that the assist map is not written in the ECU.

Tech Tips

The assist map is data written in the power steering ECU assembly to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data (designation and grade package information).

DTC No. DTC Detection Item Trouble Area
C1581 Assist map is not written in the power steering ECU assembly.

  • ECM

  • Gateway ECU

  • Power steering ECU assembly

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Turn the engine switch on (IG), and wait at least 30 seconds.

      Tech Tips

      The assist map is automatically written when approximately 30 seconds have elapsed after the engine switch is turned on (IG). DTC C1581 will be cleared after the assist map is written.

    2. Check for DTCs.

      OK
      DTC C1581 is not output.

    NG

    CHECK CAN COMMUNICATION SYSTEM Click here

    OK

    END

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system.

      OK
      DTCs are not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  3. CHECK MULTIPLEX COMMUNICATION SYSTEM


    1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the multiplex communication system (BEAN).

      OK
      DTCs are not output.

    NG

    GO TO MULTIPLEX COMMUNICATION SYSTEM Click here

    OK

  4. CHECK ECM


    1. Check if the correct ECM is installed.

      OK
      The correct ECM is installed.

    NG

    REPLACE ECM Click here

    OK

  5. CHECK GATEWAY ECU


    1. Check if the correct gateway ECU is installed.

      OK
      The correct gateway ECU is installed.

      Note

      If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.


    NG

    REPLACE GATEWAY ECU

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here