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
U1010	49	CONTROL UNIT (CAN) [Control unit (CAN) ]	Diagnosis condition	Ignition switch ON
			Signal (terminal)	-
			Threshold	Detecting error during the initial diagnosis of CAN controller of ATR control module.
			Diagnosis delay time	10 seconds or more

POSSIBLE CAUSE

ATR control module

FAIL-SAFE

ATR control module stops signal to the ATR actuator

DTC CONFIRMATION PROCEDURE

PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted. always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Check DTC.
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GO TO 2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check DTC.
Is 1st trip 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