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Electronic Power Steering System: Calibration

  1. ROTATION ANGLE SENSOR VALUE INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION 
    NOTE: Clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point if any of the following has occurred:
    • The power steering ECU assembly has been replaced.
    • The power steering link assembly has been replaced.
    • Steering effort differs between left and right.
    1. Inspection before calibration
      1. Connect the intelligent tester to the DLC3.
      2. Turn the ignition switch on.
      3. Turn the intelligent tester on.
      4. Select "IG SUPPLY" from the data list.
      5. Check the IG power supply voltage on the tester screen.
        REFERENCE VALUE

        Item Measurement Item/Range (Display) Inspection Condition Reference Value
        IG SUPPLY ECU power source voltage/ Min.: 0 V, Max.: 25.5 V Ignition switch on 10 to 14V

        Voltage: 

        10 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. Rotation angle sensor calibration value clear, rotation angle sensor value 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 value cannot be initialized. Clear the DTC before starting initialization.
      1. Connect the intelligent tester to the DLC3.
      2. Put the vehicle into the READY-on state.
      3. Turn the intelligent tester on.
      4. Select "TRQ SENSOR ADJUST".
      5. Follow the procedures on the tester display to clear the rotation angle sensor calibration value, initialize the rotation angle sensor and, and calibrate the torque sensor zero point.
        NOTE:
        • When initializing the rotation angle sensor value, observe the following to stabilize sensor voltage:

          After putting the vehicle into the READY-on state, wait for at least 2.5 seconds before turning the steering wheel. Do not turn the steering wheel quickly.

        • The steering wheel will vibrate during torque sensor zero point calibration. Do not touch the steering wheel while it is vibrating or for 2 seconds after it stops.
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