DTC Description

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 independently). In CAN communication, control units are connected with 2 communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Signal Chart. Refer to CAN Communication Signal Chart

DTC DETECTION LOGIC

DTC No.	M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
U1000-01	CAN COMM CIRCUIT (CAN communication circuit)	Diagnosis condition	When ignition switch is ON
		Signal (terminal)	CAN communication signal
		Threshold	—
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

The system using the CAN communication signal from control unit which cannot communicate does not function.

CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

With M.U.T.-III SE

Turn ignition switch ON.
Turn ignition switch OFF and wait for 4 minutes.
Turn ignition switch ON and wait at least 1 minute or more.
Select “Self Diagnostic Result” mode of “MULTI AV” using M.U.T.-III SE.
Check DTC.

Is DTC U1000-01 detected?

Proceed to Diagnosis Procedure

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

-2Confirmation after repair: INSPECTION END