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Section 526 (Electric Power Steering System - Diagnosis): Calibration

WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. INITIALIZATION OF TORQUE SENSOR ZERO POINT CALIBRATION SIGNAL 
    NOTE: Under the following conditions, perform torque sensor zero point calibration after initializing the torque sensor zero point calibration signal in the ECU:
    • The steering column assy (containing the torque sensor) has been replaced. 
    • The power steering ECU assy has been replaced. 
    • The steering wheel has been replaced. 
    • The steering gear assy has been replaced. 
    • There is a difference in steering effort between right and left. 
    1. Center the steering wheel and align the front wheels straight ahead.
    2. Connect the hand-held tester to the DLC3.
    3. Turn the power switch on (IG) and then initialize the torque sensor zero point calibration signal by following the tester screen.
      NOTE: Do not turn the steering wheel while initializing the zero point calibration signal.
    4. Perform steering zero point calibration after turning the power switch off.
    NOTE: Zero point calibration cannot be carried out with the power switch on (IG) after initialization of the zero point calibration signal is completed.
    Fig 1: Scan Tool Display (1 Of 4)
    G02918358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Scan Tool Display (2 Of 4)
    G02918359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. TORQUE SENSOR ZERO POINT CALIBRATION 
    1. Center the steering wheel and align the front wheels straight ahead.
    2. Connect the hand-held tester to the DLC3.
    3. Turn the power switch on (IG) and then perform the zero point calibration by following the tester screen.
      NOTE:
      • The vehicle is stopped.
      • Do not start the engine. (Do not turn the power switch on (READY).)
      • Do not turn the steering wheel.
      • The vehicle is on level ground.
    4. Confirm that no DTCs are output after completing the operation.
      1. When DTC C1515 is output, see DTC C1515 TORQUE SENSOR ZERO POINT ADJUSTMENT UNDONE  .
      2. When DTC C1516 is output, see DTC C1516 TORQUE SENSOR ZERO POINT ADJUSTMENT INCOMPLETE  .
      3. When DTC C1534 is output, see DTC C1531 ECU ABNORMAL DTC C1532 ECU ABNORMAL DTC C1533 ECU ABNORMAL DTC C1534 ECU ABNORMAL  .
    Fig 3: Scan Tool Display (3 Of 4)
    G02918360Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Scan Tool Display (4 Of 4)
    G02918361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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