DTC Description
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 transmits/receives data but selectively reads required data only.
DTC DETECTION LOGIC
| DTC No. | Trouble diagnosis name (Trouble diagnosis content) |
DTC detecting condition | Possible cause |
|---|---|---|---|
| U0122 | VDC MDL (Lost communication with vehicle dynamics control module) |
When ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) with ABS actuator and electric unit (control unit) for 2 seconds or more. | CAN communication line between ECM and ABS actuator and electric unit (control unit) (CAN communication line is open or shorted) |