Power Steering System

POWER STEERING: POWER STEERING SYSTEM: PRECAUTION

1. HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM

(a) The vehicle is equipped with an SRS (Supplemental Restraint System) such as airbags. 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 column assembly.

(b) If disconnecting the steering sliding yoke sub-assembly and the pinion shaft on the power steering column assembly, be sure to place matchmarks before starting the operation.

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

3. HANDLING PRECAUTION

(a) When handling the electronic parts:

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

* Do not expose any electronic parts to high temperatures and humidity.

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

(b) When handling the steering column assembly:

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

* Do not pull the wire harness when moving the steering column assembly.

(c) When disconnecting and reconnecting the connectors:

When disconnecting the connectors related to the power steering system, turn the ignition switch to ON, center the steering wheel, turn the ignition switch off, and then disconnect the connectors.

4. PRECAUTIONS FOR CAN COMMUNICATION

(a) CAN communication lines are used to receive information from the skid control ECU and the ECM, 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.

5. POWER STEERING SYSTEM FUNCTIONS

(a) If the 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 battery voltage recovers.

HINT
If the EPS warning light comes on but no DTCs are stored, check the Data List "Battery Voltage Lo Record" Data List / Active Test.