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		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
U0146	00	LOST COMM (CGW) (Lost communication with gateway "A" )	Diagnosis condition	Ignition switch ON
			Signal (terminal)	CAN communication signal
			Threshold	When ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) with CGW
			Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication line between CGW and ECM (CAN communication line is open or shorted)

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait at least 3 seconds.
Check DTC.

Is DTC detected?

Refer to DTC Diagnosis Procedure

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END