POWER STEERING SYSTEM CALIBRATION


  1. ROTATION ANGLE SENSOR INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION

    Note

    Clear the rotation angle sensor calibration, initialize rotation angle sensor and calibrate torque sensor zero point if any of the following has occurred:


    • The power steering ECU assembly has been replaced.

    • The electric power steering column sub-assembly has been replaced.

    • The power steering motor assembly has been replaced.

    • Steering effort differs between left and right.


    1. Inspection before calibration


      1. Turn the power switch off.

      2. Connect the intelligent tester to the DLC3.

      3. Turn the power switch on (IG).

      4. Turn the intelligent tester on.

      5. Calibrate the power steering ECU. Enter the following menus: Chassis / EMPS / Data List.

      6. Check the values by referring to the table below.

        EMPS
        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        IG Power Supply

        ECU power source voltage/

        Min.: 0 V

        Max.: 20.1531 V

        		 11 to 14 V Power switch on (IG)

        Note

        If the IG power supply voltage is 9 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

      7. Rotation angle sensor calibration clear, rotation angle sensor initialization and torque sensor zero point calibration

        Note


        • If DTC C1516 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTC before starting calibration.

        • If DTC C1526 (Rotation Angle Sensor Initialization Incomplete) is stored, the rotation angle sensor cannot be initialized. Clear the DTC before starting initialization.


        1. Set the steering wheel to the center point and align the front tires straight ahead.

        2. Turn the power switch off.

        3. Connect the intelligent tester to the DLC3.

        4. Turn the power switch on (IG).

        5. Turn the intelligent tester on.

        6. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

          Note


          • Do not turn the steering wheel sharply.

          • Do not touch the steering wheel during the torque sensor zero point calibration (for 3 seconds).

        7. Check for DTCs Click here.

          Note


          • After rotation angle sensor initialization and zero point calibration is completed normally, confirm that DTC is not output.

          • If DTC C1515, C1516, C1525, C1526, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.

        8. Result
        Result See Procedure
        DTC C1515 is output.

        Click here

        DTC C1516 is output.

        Click here

        DTC C1525 is output.

        Click here

        DTC C1526 is output.

        Click here

        DTC C1534 is output.

        Click here

        DTC C1581 is output.

        Click here

  • ASSIST MAP WRITING

    Tech Tips

    If DTC C1581 is output after torque sensor zero point calibration, perform assist map writing.

    Note

    Perform assist map writing if any of the following conditions occur:


    • The power steering ECU assembly has been replaced.


    1. Turn the power switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / EMPS / Utility / Signal Check.

      Tech Tips


      • Follow the instructions on the intelligent tester to perform Signal Check.

      • With DTC C1581 output, performing Signal Check will cause the power steering ECU assembly to enter Test Mode and the assist map will be written automatically.

    6. Check for DTCs Click here.

      Tech Tips

      After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 Click here.