Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING
ELECTRONIC POWER STEERING SYSTEM - PRECAUTION
- NOTICE:
- When disconnecting the negative (-) battery cable, initialize the following systems after the cable is reconnected.
| System Name | See Procedure |
| Parking Assist Monitor System | |
| Power Window Control System |
| 1.HANDLING PRECAUTIONS |
When handling the electronic parts:
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.
Do not expose any electronic parts to high temperature or humidity.
Do not touch the connector terminals in order to prevent deformation or malfunctions due to static electricity.
If the power steering ECU assembly has been replaced with a new one, initialize the rotation angle sensor value and calibrate the torque sensor zero point .
When handling the power steering gear assembly:
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.
Do not pull on the wire harness when moving the power steering gear assembly.
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 .
When disconnecting and reconnecting the connectors:
Turn the engine switch on (IG), center the steering wheel, and turn the engine switch off again before disconnecting the connectors related to the electronic power steering system.
Ensure that the engine switch is off before reconnecting the connectors related to the electronic 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.
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 .
| 2.PRECAUTIONS FOR CAN COMMUNICATION |
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.
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.
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 |
After repairing the bus line with solder, wrap the repaired part with electrical tape.
- NOTICE:
When installing, make sure to braid them.
CAN bus lines are likely to be influenced by electrical noise if they are not braided.
Do not use bypass wiring between the connectors.
- NOTICE:
- The ability of the braided bus lines to resist interference will be lost if bypass wiring is used.