Power Steering: Service Precautions

Power steering system

Precautions

1. Correct handling and precautions for operation.
(1) Handling of electrical parts.
(a) Do not apply any impact to any electrical parts such as the power steering computer ASSY. Be sure to replace with a new part if strong impact is applied (such as hitting or dropping the part).
(b) Do not expose electric parts to extreme temperatures or high humidity.
(c) Do not touch the connector terminals as they may become deformed, or damaged due to static electricity discharge.
(2) Handling of the power steering computer ASSY.
(a) Be sure to use new replacement parts when replacing the power steering computer ASSY.

CAUTION:
Do not install any power steering computer ASSY that is designed to be used with other vehicles (such as demonstration models).

(b) Always perform a steering zero point calibration after replacing the power steering computer ASSY.
(3) Precautions when connecting or disconnecting connectors.
(a) Before you disconnect any connectors related to the power steering system, turn the ignition to IG ON and set the steering to the straight-ahead position. Turn the ignition to IG OFF and disconnect the connector after disconnecting the negative battery terminal.
(b) Before you connect any connectors related to the power steering system, confirm that the ignition is turned to IG OFF, connect the connector and turn the ignition to IG ON while the steering is in the straight-ahead position.

CAUTION:
Do not turn the ignition to IG ON if the steering is not in the straight-ahead position.

(c) If the above procedures are not carried out, the steering neutral (zero point) position can shift and you may experience a difference in the steering effort required for the left and right directions. Please perform a zero point calibration if you notice any difference in the steering effort for the left and right directions.
2. Precautions regarding CAN communication.
(1) CAN communication is used for sending and receiving information from each computer, sending warning signals to the combination meter ASSY, and communication with the DLC3. A communication error code is output if there is a problem with the CAN communication line.
(2) If a CAN communication error code is output, repair the malfunction causing the communication line error and perform power steering system troubleshooting under a normal data communication state.