POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU stores 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 to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.

DTC No. DTC Detection Condition Trouble Area
C1581 Assist map not written in power steering ECU

  • CAN communication system

  • Power steering converter assembly

  • Power steering ECU

INSPECTION PROCEDURE

Note

If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration Click here.

PROCEDURE


  1. INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT


    1. Initialize the rotation angle sensor value and calibrate the torque sensor zero point Click here.

      Tech Tips

      The assist map is automatically written during the rotation angle sensor initialization and torque sensor zero point calibration.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1581 is not output. A
      DTC C1581 is output. B

      Tech Tips

      DTC C1581 will be cleared after the assist map is written.


    B

    CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Click here

    A

    END

  3. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


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

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  4. CHECK POWER STEERING CONVERTER ASSEMBLY


    1. Check if a power steering converter assembly that complies with the vehicle specifications is installed.

      OK
      The power steering converter assembly that complies with vehicle specifications is installed.

    NG

    REPLACE POWER STEERING CONVERTER ASSEMBLY Click here

    OK

    REPLACE POWER STEERING ECU Click here