Power Steering System

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: PRECAUTION

1. HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM

(a) 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 Service Precautions.

2. PRECAUTIONS FOR REMOVAL, INSTALLATION AND REPLACEMENT OF ELECTRONIC MOTOR POWER STEERING COMPONENTS

(a) Be sure to align the front wheels straight ahead when removing and installing the power steering gear assembly.

(b) When disconnecting the No. 2 steering intermediate shaft assembly, be sure to place matchmarks before starting the operation.

(c) After replacing the power steering ECU, clear the rotation angle sensor calibration value, initialize the rotation angle sensor, calibrate the torque sensor zero point and assist map writing Programming and Relearning.

3. HANDLING PRECAUTION

(a) When handling the electronic parts:

(1) Avoid any impact to electronic parts such as ECUs and relays. Replace them 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.

(b) When handling the power steering ECU:

(1) When the power steering ECU has been replaced with a new one, perform the assist map writing, the rotation angle sensor value initialization and the torque sensor zero point calibration Programming and Relearning.

(c) When disconnecting and 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).

NOTICE:
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 Programming and Relearning.

4. PRECAUTIONS FOR CAN COMMUNICATION

(a) CAN communication lines are used to receive information from the skid control ECU and the hybrid vehicle control ECU, and to transmit warnings to the combination meter.

When there are any problems in the CAN communication lines, DTCs of the CAN communication line are output.

(b) Perform troubleshooting for the communication line problems when the CAN communication DTCs are output. Be sure to start troubleshooting on the power steering system after confirming that the CAN communication system is normal.

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