2009 Lexus LS 600hLFACTORY OEM SERVICE PROCEDURE

Power Steering System

  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 has been replaced.
    • The power steering gear assembly has been replaced.
    • Steering effort differs between left and right.
    1. Inspection before calibration.
      1. Connect the Techstream to the DLC3.
      2. Turn the power switch ON (IG).
      3. Turn the Techstream on.

        Select "IG Supply" from the Data List.

      4. Check the IG power supply voltage on the Techstream screen.
      EMPS

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG Supply ECU power source voltage/
      Min.: 0 V, Max.: 25.5 V      		 Power switch ON (IG): 11 to 14 V When malfunction occurs, problem may be ECU power supply

      Standard voltage

      11 to 14 V

      NOTE:

      If the IG power supply voltage is less than 11 V, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

    2. Clearing rotation angle sensor calibration value, 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 (Motor Rotation Angle Sensor Initialization Incomplete) is stored, the rotation angle sensor value cannot be initialized. Clear the DTC before starting initialization.
        1. Connect the Techstream to the DLC3.
        2. Turn the power switch ON (IG).
        3. Turn the Techstream on.

          Select "Torque Sensor Adjustment".

        4. Follow the procedures on the Techstream display to clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point.
          NOTE:
          • When initializing the rotation angle sensor value, observe the following to stabilize sensor voltage:

            After turning the power switch ON (IG), 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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.