Click here

POWER STEERING SYSTEM CALIBRATION

Click here
Click here
Click here

  1. TORQUE SENSOR ZERO POINT CALIBRATION

    Note:

    Perform the torque sensor zero point calibration if any of the following conditions occur:


    • The steering column assembly (containing the torque sensor) has been replaced.

    • The power steering motor assembly has been replaced.

    • The power steering ECU assembly has been replaced.

    • There is a difference in steering effort between turning right and left.

    Tip:

    When torque sensor zero point calibration is performed, the assist map is written automatically at the same time.


    1. Inspection before calibration.


      1. Turn the ignition switch off.

      2. Connect the intelligent tester to the DLC3.

      3. Turn the ignition switch to ON.

      4. Turn the tester on.

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

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

        Table 1. 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 Ignition switch ON
        Standard voltage
        11 to 14 V
        Note:

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

    2. Perform the 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.


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

      2. Turn the ignition switch off.

      3. Connect the intelligent tester to the DLC3.

      4. Start the engine.

      5. Turn the tester on.

      6. Calibrate the power steering ECU assembly. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

        Note:

        • Do not touch the steering wheel during the torque sensor zero point calibration.

        • Perform the calibration only when the vehicle is stopped.

      7. Check for DTCs (Click here).

        Note:

        • After zero point calibration is completed normally, confirm that DTC is not output.

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

        Table 2. Result
        Result Proceed to
        DTC C1515 is output.

        Click here
        DTC C1516 is output.

        Click here
        DTC C1534 is output.

        Click here
        DTC C1581 is output.

        Click here

  2. ASSIST MAP WRITING

    Tip:

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


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

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

      Tip:

      • 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).

      Tip:

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