Electronic Power Steering System

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: PRECAUTION

PRECAUTION

1. FOR INITIALIZATION
NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.





2. FOR HYBRID SYSTEM ACTIVATION
NOTICE:
- When the warning light is illuminated or the battery has been disconnected and reconnected, pressing the power switch may not start the system on the first try. If so, press the power switch again.
- With the power switch's power mode changed to ON (IG), disconnect the battery. If the key is not in the key slot during reconnection, DTC B2799 may be output.

3. HANDLING PRECAUTIONS
(a) When handling the electronic parts:
(1) Avoid any impact to electronic parts such as ECUs and relays. Replace the parts with new ones if dropped or subjected to a severe impact.
(2) Do not expose any electronic parts to high temperature and humidity.
(3) Do not touch the connector terminals in order to prevent deformation or malfunctions due to static electricity.
(4) When the power steering ECU has been replaced with a new one, perform the torque sensor zero point calibration Programming and Relearning.
(b) When handling the steering column:
(1) Avoid any impact to the steering column, especially to the motor or torque sensor. Replace the parts with new ones if dropped or subjected to a severe impact.
(2) Do not pull on the wire harness when moving the steering column.
(3) When the steering column has been replaced, perform the torque sensor zero point calibration after initializing the torque sensor zero point calibration signal Programming and Relearning.
(c) When disconnecting and reconnecting the connectors:
(1) When disconnecting a connector related to the electric power steering system, turn the power switch ON (IG), center the steering wheel, turn the power switch OFF, and then disconnect the connector.
(2) When reconnecting a connector related to the electric power steering system, ensure that the power switch is OFF. Center the steering wheel and then turn the power switch ON (IG).
NOTE: 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 right and left steering effort. If there is a difference in right and left steering effort, perform the torque sensor zero point calibration Programming and Relearning.
4. PRECAUTIONS FOR CAN COMMUNICATION
(a) CAN communication is used to receive information from the skid control ECU and to transmit warnings to the meter and the multi-display. When there are any problems in the CAN communication lines, DTCs indicating the communication line malfunctions are output.
(b) Perform troubleshooting for the communication line problems when the CAN communication DTCs are output. Be sure to start troubleshooting on the electronic power steering system when data communication is normal.
(c) A temporary fix or repair with bypass wiring, etc. is impossible because the length and path of each CAN communication line is specific.