POWER STEERING SYSTEM, Diagnostic DTC:C1581

DTC Code DTC Name
C1581 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's specified communication data.

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

  • Assist map not written

  • CAN communication system

  • Combination meter assembly

  • Power steering ECU assembly

CAUTION / NOTICE / HINT

Note

If the power steering ECU assembly is replaced with a new one, perform 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. Start the engine and idle it.

      Tech Tips

      The assist map is automatically selected and written in the power steering ECU assembly when the engine is started while the vehicle is stationary.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC C1581 is not output.

      Tech Tips

      DTC C1581 is cleared after the assist map is written.


    OK

    END

    NG

  3. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


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

      OK
      DTC is not output.

    NG

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

    OK

  4. CHECK COMBINATION METER ASSEMBLY


    1. Check if a combination meter assembly that complies with the vehicle specifications is installed.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  5. CLEAR ASSIST MAP

    Tech Tips

    Repeat the clear assist map process 2 or 3 times and check the results.


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / EMPS / Utility / Assist Map Confirmation / Clear.

    5. Clear the assist map following the instructions on the GTS screen.

    6. Start the engine.

      Tech Tips

      If no assist map is currently written, it will be written in the ECU when the engine is started while the vehicle is stationary.

    7. Enter the following menus: Chassis / EMPS / Utility / Assist Map Confirmation / Clear.

    8. Check that "MAP2" is displayed on the GTS screen.

      OK
      MAP2 is output.

    OK

    END

    NG

    REPLACE POWER STEERING ECU ASSEMBLY Click here