Electronic Power Steering System Precaution

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 assembly has been replaced with a new one, initialize the rotation angle sensor and calibrate the torque sensor zero point (Click here).
   

When handling the power steering link assembly:

1. Avoid any impact to the power steering link assembly, especially to the motor or torque sensor. Replace with new parts if dropped or subjected to a severe blow.
   

2. Do not pull on the wire harness when moving the power steering link assembly.
   

3. If the power steering link assembly has been replaced with a new one, clear the rotation angle sensor calibration value, initialize the rotation angle sensor, and calibrate the torque sensor zero point (Click here).
   

4. 3UZ-FE:
   If replacing the power steering link assembly, perform VGRS actuator angle initialization and VGRS actuator angle neutral calibration after wheel alignment adjustment (Click here for INITIALIZATION, Click here for CALIBRATION).
   

When disconnecting and reconnecting the connectors:

1. 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.
   

2. 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.

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 (Click here).
   

CAN communication is used to receive information from the skid control ECU, steering control ECU, absorber control 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.

After repairing the bus line with solder, wrap the repaired part with vinyl tape.

NOTICE:

1. The CANL bus line and CANH bus line must be installed together all the time.
   When installing, make sure to twist them.
   CAN bus lines are likely to be influenced by noise if the bus lines are not twisted.
   
2. The difference in length of the CANL bus line and CANH bus line should be within 100 mm (3.937 in.).
   
3. Leave approximately 80 mm(3.150 in.) loose in the twist around the connector.
   

Do not use bypass wiring between the connectors.

NOTICE:

The feature of the twisted wire harness will be lost if you use bypass wiring.