Toyota CH-R Service Manual: Precaution

PRECAUTION

IGNITION SWITCH EXPRESSION

HINT:

The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

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

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

(b) When disconnecting the steering intermediate shaft assembly, be sure to place matchmarks before starting the operation.

(c) After replacing the electric power steering column sub-assembly or power steering ECU assembly, calibrate the torque sensor zero point.

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HANDLING PRECAUTION

(a) When handling electronic parts:

(1) Do not subject any parts such as ECUs and relays to any impact. Replace them with new ones if dropped or subjected to a strong impact.

(2) Do not expose any electronic parts to high temperatures or humidity.

(3) In order to prevent deformation or malfunctions due to static electricity, do not touch the connector terminals.

(b) When handling the power steering ECU assembly:

(1) When the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

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(c) When handling the electric power steering column sub-assembly:

(1) Do not subject the electric power steering column sub-assembly (especially the motor and torque sensor) to any impact. Replace the electric power steering column sub-assembly with a new one if subjected to a strong impact.

(2) Do not pull the wire harness when moving the electric power steering column sub-assembly.

(3) If the electric power steering column sub-assembly has been replaced, perform torque sensor zero point calibration.

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(d) When disconnecting and reconnecting the connectors:

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

(2) Before reconnecting connectors related to the power steering system, ensure that the ignition switch is off. Then center the steering wheel and turn the ignition switch to ON.

NOTICE:

Do not turn the ignition switch to ON 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 torque sensor zero point calibration after initializing the torque sensor zero point.

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PRECAUTIONS FOR CAN COMMUNICATION

(a) CAN communication lines are used to receive information from the skid control ECU (brake actuator assembly) and ECM and to transmit warnings to the combination meter assembly. When problems are detected in the CAN communication lines, CAN communication DTCs are stored.

(b) If any CAN communication system DTCs are output, perform troubleshooting for the CAN communication system first.

(c) The wiring used for each communication line is a twisted pair of wires that have an equal length. Do not temporarily repair a CAN communication line with a bypass wire or equivalent.