U1003

U0113, U1003 CAN COMM CIRCUIT





Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- tiplex communication line with high data communication speed and excellent error detection ability. ECM and
VVEL control module are connected with two communication lines (CAN H line and CAN L line) and transmit/receive data. ECM shares information and links with the VVEL control module during operation.




DTC Logic

DTC DETECTION LOGIC

NOTE:
If DTC U0113 or U1003 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to P0607.

DTC Detection Logic:

DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 3 seconds.
2. Check DTC.
Is DTC detected?
YES - Go to U0113.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK VVEL CAN COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect VVEL control module harness connector.
4. Check the continuity between ECM harness connector and VVEL control module harness connector.





5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E10, F10
- Harness for open or short between ECM and VVEL control module
- Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace.
4.REPLACE VVEL CONTROL MODULE
1. Replace VVEL control module.
2. Perform Description Special Repair Requirement Description
- GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select "SELF DIAGNOSTIC RESULT" mode with CONSULT-III.
4. Touch "ERASE".
5. Perform DTC Confirmation Procedure.
See U0113.
With GST
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select Service $04 with GST.
4. Perform DTC Confirmation Procedure.
See U0113.
Is the DTC U0113 or U1003 displayed again?
YES - GO TO 6.
NO - INSPECTION END
6.REPLACE ECM
1. Replace ECM.
2. Perform Special Repair Requirement.
- INSPECTION END