2012 Toyota Prius TwoFACTORY OEM SERVICE PROCEDURE

Steering System: Precaution: Precaution

  1. HANDLING PRECAUTIONS FOR STEERING SYSTEM 
    1. Care must be taken when replacing parts. Incorrect replacement may affect the performance of the steering system and result in a driving hazard.
  2. HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM 
    1. The vehicle is equipped with a Supplemental Restraint System (SRS). Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing. This may cause a serious accident. Before servicing (including inspection, replacement, removal, and installation of parts), be sure to read the precautionary notices for the Supplemental Restraint System. Refer to PRECAUTION .
  3. HANDLING PRECAUTIONS FOR STEERING COLUMN (for Brushless Type Motor) 
    1. When handling the steering column assembly:
      1. Avoid any impact to the electric power steering column sub-assembly, especially to the torque sensor. Replace the electric power steering column sub-assembly with a new one if it is dropped or subjected to any severe impacts.
      2. Avoid any impact to the power steering motor assembly. Replace the power steering motor assembly with a new one if it is dropped or subjected to any severe impacts.
      3. Do not pull the wire harness when moving the steering column assembly.
      4. When the electric power steering column sub-assembly has been replaced, perform the rotation angle sensor value initialization and the torque sensor zero point calibration after initializing the torque sensor zero point. Refer to CALIBRATION .
      5. Do not release the tilt lever when the electric power steering column sub-assembly is not installed on the vehicle.
    2. When disconnecting or reconnecting the connectors:
      1. Before disconnecting the connectors related to the power steering system, turn the power switch on (IG), center the steering wheel, turn the power switch off, and then disconnect the connectors.
      2. Before reconnecting the connectors related to the power steering system, ensure that the power switch is off. Then center the steering wheel and turn the power switch on (IG).
        NOTE:

        Do not turn the power switch on (IG) when the steering wheel is not centered.

      3. If the above operations are not carried out properly, the steering center point (zero point) will deviate, which may lead to a difference in steering effort between turning right and left. If there is a difference in steering effort between turning right and left, perform the rotation angle sensor value initialization and the torque sensor zero point calibration after initializing the torque sensor zero point. Refer to CALIBRATION .
  4. HANDLING PRECAUTIONS FOR STEERING COLUMN (for Brush Type Motor) 
    1. When handling the steering column assembly:
      1. Avoid any impact to the electric power steering column sub-assembly, especially to the torque sensor. Replace the electric power steering column sub-assembly with a new one if it is dropped or subjected to any severe impacts.
      2. Avoid any impact to the power steering motor assembly. Replace the power steering motor assembly with a new one if it is dropped or subjected to any severe impacts.
      3. Do not pull the wire harness when moving the steering column assembly.
      4. When the electric power steering column sub-assembly has been replaced, perform the torque sensor zero point calibration after initializing the torque sensor zero point. Refer to CALIBRATION .
      5. Do not release the tilt lever when the electric power steering column sub-assembly is not installed on the vehicle.
    2. When disconnecting or reconnecting the connectors:
      1. Before disconnecting the connectors related to the power steering system, turn the power switch on (IG), center the steering wheel, turn the power switch off, and then disconnect the connectors.
      2. Before reconnecting the connectors related to the power steering system, ensure that the power switch is off. Then center the steering wheel and turn the power switch on (IG).
        NOTE:

        Do not turn the power switch on (IG) when the steering wheel is not centered.

      3. If the above operations are not carried out properly, the steering center point (zero point) will deviate, which may lead to a difference in steering effort between turning right and left. If there is a difference in steering effort between turning right and left, perform the torque sensor zero point calibration after initializing the torque sensor zero point. Refer to CALIBRATION .
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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.