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	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U0122-00	VDC MDL (Lost communication with vehicle dynamics control module)	Diagnosis condition	-
		Signal (terminal)	-
		Threshold	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.
		Diagnosis delay time	-

POSSIBLE CAUSE 

• CAN communication line between ECM and ABS actuator and electric unit (control unit)
• (CAN communication line is open or shorted)

FAIL-SAFE 

Not applicable