POWER STEERING SYSTEM (for 2AR-FSE), Diagnostic DTC:C1581/26

DTC Code DTC Name
C1581/26 Assist Map Number Un-Writing

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area
C1581/26 The assist map is not written in the power steering ECU assembly.

  • CAN communication system

  • Power management control ECU

  • Absorber control ECU (w/ Adaptive Variable Suspension System)

  • Power steering ECU assembly

INSPECTION PROCEDURE

Note

If the power steering ECU assembly is replaced with a new one, perform assist map writing, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value and calibrate the torque sensor zero point Click here.

PROCEDURE


  1. PERFORM ASSIST MAP WRITING


    1. Perform assist map writing Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1581/26 is output A
      DTC C1581/26 is not output B

      Tech Tips

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


    B

    END

    A

  2. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output for LHD B
      for RHD C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  3. CHECK RELATED PART


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

      Related Part Power management control ECU
      Absorber control ECU (w/ Adaptive Variable Suspension System)

      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 power management control ECU Click here.

      • Refer to the following procedures to remove the absorber control ECU (w/ Adaptive Variable Suspension System) Click here.

      Tech Tips

      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

      Result

      Proceed to
      All installed related parts have correct part numbers A
      Part with incorrect part number is installed B

    B

    REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here