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
U1000	01	CAN COMM CIRCUIT(Manufacturer Controlled DTC)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	CAN communication signal
			Threshold	ATR control module is not transmitting or receiving CAN communication signal
			Diagnosis delay time	10 seconds or more

POSSIBLE CAUSE

NOTE:

Confirm if DTC is PAST or CRNT. If DTC is CRNT, proceed with Diagnosis Procedure. If DTC is PAST, clear DTC. Do not replace the ECM for a PAST DTC.

Harness or connectors (CAN communication line is open or shorted)

FAIL-SAFE

ATR control module stops signal to the ATR actuator

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check DTC.
Is DTC detected?

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Proceed to Diagnosis Procedure .

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To check malfunction symptom before repair: Refer to Intermittent Incident

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Confirmation after repair: INSPECTION END