ECU IDENTIFICATION
Displays the part number stored in the control unit.
Description
- In general, customers have their own criteria for a problem. Therefore, it is important to understand the symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all the information for the diagnosis, prepare the interview sheet referring to the interview points.
- In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
Scheme 2
EPS control unit receives the vehicle speed signal from ABS actuator and electric unit (control unit) via CAN communication line.
EPS control unit receives the engine status signal from ECM via CAN communication line.
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit communicate data but selectively reads required data only.
EPS warning lamp does not turn ON when turning ignition switch ON from OFF. (Check the illumination of the EPS warning lamp.)
EPS warning lamp does not turn OFF several seconds after engine started.
Steering wheel turning force is heavy or light.
Unbalance steering wheel turning force and return between right and left.
Unbalance steering wheel turning force (torque variation).