POWER STEERING SYSTEM PRECAUTION


  1. IGNITION SWITCH EXPRESSION


    1. The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

      Expression Ignition Switch (Position) Power Switch (Condition)
      Ignition switch off LOCK Off (Lock)
      Ignition switch ACC ACC On (ACC)
      Ignition switch ON (IG) ON (IG) On (IG)
      Ignition switch ON (READY) ON (READY) On (Ready)

  2. HANDLING PRECAUTION


    1. When handling the electronic parts:


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

      • Do not expose to high temperatures or humidity.

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

      • When the power steering ECU assembly has been replaced with a new one, perform the torque sensor zero point calibration and assist map writing Click here.

    2. When handling the steering column sub-assembly and power steering motor assembly:


      • Avoid any impact to the steering column sub-assembly, especially to the motor and torque sensor. Replace with new ones if dropped or subjected to a severe blow.

      • Do not pull the wire harness when moving the steering column sub-assembly.

      • When the steering column sub-assembly and power steering motor assembly has been replaced, perform the torque sensor zero point calibration after initializing the torque sensor zero point Click here.

  3. PRECAUTIONS FOR CAN COMMUNICATION


    1. CAN communication lines are used to receive information from the brake booster with master cylinder assembly (skid control ECU) and power management control ECU, and to transmit warnings to the combination meter assembly. When there are any problems in the CAN communication lines, DTCs of the CAN communication line are output.

    2. Perform troubleshooting of the communication line problems when the CAN communication DTCs are output. Be sure to start troubleshooting on the electronic power steering system after confirming that the CAN communication system is normal.

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

  4. POWER STEERING SYSTEM FUNCTIONS


    1. If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist may be reduced and the EPS warning light may come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.

      Tech Tips

      If the EPS warning light comes on but no DTCs are stored, check the Data List "Battery Voltage Lo Record" Click here.