POWER STEERING SYSTEM (for 2AR without Wireless Door Lock) CALIBRATION

  1. TORQUE SENSOR ZERO POINT CALIBRATION

    Note

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

    • The power steering ECU assembly has been replaced.

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

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

    Tech Tips

    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 Techstream to the DLC3.

      3. Turn the ignition switch to ON.

      4. Turn the Techstream 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.

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

        ECU power source voltage/

        Min.: 0.0000 V

        Max.: 20.1531 V

        		 9 to 16 V Ignition switch ON

        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.

      7. 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 DTCs 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 Techstream to the DLC3.

        4. Start the engine.

        5. Turn the Techstream 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 torque sensor zero point calibration.

          • Perform calibration only when the vehicle is stopped.

        7. Wait for at least 5 seconds.

        8. Check for DTCs Click here.

          Note

          • After zero point calibration has completed normally, confirm that no DTCs are not output.

          • If DTC C1515, C1516, 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 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.

    1. Turn the ignition switch off.

    2. Connect the Techstream to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the Techstream on.

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

      Tech Tips

      • Follow the instructions on the Techstream 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. Wait for at least 1 second.

    7. 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.