POWER STEERING SYSTEM (for 2GR-FXE) PRECAUTION


  1. PRECAUTIONS FOR INSPECTING THE HIGH-VOLTAGE PARTS


    1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

      Note


      • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

      • After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) unless instructed by the repair manual.

    2. After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals Click here.

      Tech Tips

      Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

    3. Check the voltage at the terminals in the inspection point in the inverter with converter assembly Click here.

      CAUTION:

      Be sure to wear insulated gloves.

    4. When turning the power switch on (IG) during inspections, do not press the power switch with the brake pedal depressed.

      CAUTION:

      Pressing the power switch with the brake pedal depressed causes the system to enter the READY-on state. This is very dangerous because high voltage may be applied to the inspection area.

    5. Turn the power switch off, wear insulated gloves, and disconnect the cable from the negative (-) terminal of the auxiliary battery before touching any of the orange-colored wires of the high-voltage system.

      Note

      After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

    6. Turn the power switch off before performing any resistance checks.

    7. Turn the power switch off before disconnecting or reconnecting any connectors.

    8. When performing work involving high-voltage wires, use either a tool wrapped with vinyl insulation tape or an insulated tool.

    9. When high-voltage connectors are removed, wrap the connectors with insulation tape to prevent them from contacting foreign objects.

  2. HANDLING PRECAUTIONS


    1. When handling the electronic parts:


      1. Avoid any impact to electronic parts such as ECUs and relays. Replace these parts with new ones if dropped or subjected to a severe blow.

      2. Do not expose any electronic parts to high temperatures or humidity.

      3. Do not touch the connector terminals in order to prevent deformation or malfunctions due to static electricity.

    2. When handling the power steering ECU:


      1. If replacing the power steering ECU assembly, always replace it with a new one (if the power steering ECU assembly is not replaced with a new one, DTCs may be stored).

        Note

        Do not use a power steering ECU assembly from another vehicle (display model, etc.).

      2. After replacing the power steering ECU assembly, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value, calibrate the torque sensor zero point and perform assist map writing Click here.

    3. When handling the power steering link assembly:


      1. Avoid any impact to the power steering link assembly, especially to the motor or torque sensor. Replace these parts with new ones if dropped or subjected to a severe blow.

      2. Do not pull on the wire harness when moving the power steering link assembly.

      3. If the power steering link assembly has been replaced with a new one, clear the motor rotation angle sensor calibration value, initialize the motor rotation angle sensor value, and calibrate the torque sensor zero point Click here.

    4. Precautions related to the Variable Gear Ratio Steering System:


      1. As the steering wheel may become off-center if parts between the steering wheel and tires are removed and installed, replaced or adjusted (for example, the power steering link assembly is replaced or removed and installed, the intermediate shaft is disconnected, the tie rods are adjusted, etc.), be sure to perform actuator angle neutral point calibration and initialization Click here.

    5. Precautions related to the Dynamic Rear Steering System:


      1. If the DRS ECU (rear steering control ECU), rear steering link assembly or the rear suspension are removed and installed, replaced, or adjusted, perform neutral position memorization and motor rotation angle sensor calibration, as the steering may have become off-centered Click here.

    6. When disconnecting and reconnecting the connectors:


      1. Turn the power switch on (IG), center the steering wheel, and then turn the power switch off before disconnecting the connectors related to the power steering system.

      2. Make sure that the power switch is off before reconnecting the connectors related to the power steering system. After reconnection, 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 right and left. If there is a difference in steering effort between right and left, perform steering zero point calibration Click here.

  3. PRECAUTIONS FOR CAN COMMUNICATION


    1. CAN communication is used to receive information from the skid control ECU, power steering ECU, power management control ECU, etc., and to transmit warnings to the combination meter. If there are any problems in the CAN communication lines, DTCs indicating communication line malfunctions are stored.

    2. Perform troubleshooting for communication line problems if CAN communication DTCs are output. Be sure to start troubleshooting on the power steering system only when data communication is normal.

    3. Since the CAN communication line has a specific length and route, it cannot be repaired temporarily with a bypass wire, etc.

  4. HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM

    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 Supplemental Restraint System Click here.

  5. PRECAUTIONS FOR REMOVAL, INSTALLATION AND REPLACEMENT OF POWER STEERING COMPONENTS


    1. Be sure to align the front wheels straight ahead when removing and installing the power steering link assembly.

    2. If disconnecting the No. 2 steering intermediate shaft assembly or the steering sliding with shaft yoke sub-assembly of the power steering link assembly, be sure to put matchmarks on the parts before starting the procedure.

  6. PRECAUTIONS FOR POWER STEERING SYSTEM


    1. When the auxiliary battery voltage is low, windshield deicer, rear window defogger, outer mirror heater, PTC heater and seat heater operation may be limited as part of power steering system load control.

    2. When the auxiliary battery voltage is low, which may result in an increase in the force required to steer, the power steering warning light is turned on to warn the driver.