Power Steering System
POWER STEERING: POWER STEERING SYSTEM: PRECAUTION
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected.
1. HANDLING PRECAUTIONS
(a) 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 temperature or humidity.
(3) Do not touch the connector terminals in order to prevent deformation or malfunctions due to static electricity.
(4) If the power steering ECU has been replaced with a new one, initialize the rotation angle sensor value and calibrate the torque sensor zero point Power Steering System.
(b) When handling the power steering gear assembly:
(1) Avoid any impact to the power steering gear 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 gear assembly.
(3) If the power steering gear assembly has been replaced with a new one, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point Power Steering System.
(c) When disconnecting and reconnecting the connectors:
(1) Turn the engine switch on (IG), center the steering wheel, and turn the engine switch off before disconnecting the connectors related to the electric power steering system.
(2) Ensure that the engine switch is off before reconnecting the connectors related to the electric power steering system. After reconnection, center the steering wheel and turn the engine switch on (IG).
NOTICE:
Do not turn the engine 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 Power Steering System.
2. PRECAUTIONS FOR CAN COMMUNICATION
(a) CAN communication is used to receive information from the skid control ECU, power steering ECU, ECM and steering angle sensor, and to transmit warnings to the combination meter. It is also used for communication between terminals TC and TS of the DLC3. If there are any problems in the CAN communication lines, DTCs indicating communication line malfunctions are output.
(b) Perform troubleshooting for communication line problems if CAN communication DTCs are output. Be sure to start troubleshooting on the electric power steering system only when data communication is normal.
(c) Temporary fixing or repair with bypass wiring, etc. is impossible because the length and path of each CAN communication line is specified.
3. BUS LINE REPAIR
(a) After repairing the bus line with solder, wrap the repaired part with electrical tape.
NOTICE:
* The CANL bus line and CANH bus line must be installed together at all times.
When installing, make sure to braid them.
CAN bus lines are likely to be influenced by electrical noise if they are not braided.
* The difference in length between the CANL bus line and CANH bus line should be 100 mm (3.94 in.) or less.
* Leave approximately 80 mm (3.15 in.) loose in the braided wires around the connector.
(b) Do not use by-pass wiring between the connectors.
NOTICE:
The ability of the braided bus lines to resist interference will be lost if by-pass wiring is used.
4. 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.
5. 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 link.
(b) w/ VGRS:
If disconnecting the No. 2 steering intermediate shaft, steering sliding yoke and the pinion shaft of the power steering link, be sure to put matchmarks before starting the operation.
(c) w/o VGRS:
If disconnecting the No. 2 steering intermediate shaft, steering sliding yoke, steering intermediate shaft and the pinion shaft of the power steering link, be sure to put matchmarks before starting the operation.
(d) After replacing the power steering link or power steering ECU, clear the rotation angle sensor calibration value, initialize the rotation angle sensor, and calibrate torque sensor zero point Power Steering System.