U1024

U1024 CAN COMM CIRCUIT





DTC Logic

DTC DETECTION LOGIC

NOTE:
If DTC U1024 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. P0607.






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 10 V or more 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 - Proceed to SEE Diagnosis Procedure.
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 for open or short between ECM and VVEL control module
- Loose or poor connection for each connector and harness
- Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace.
4.REPLACE VVEL CONTROL MODULE
Replace VVEL control module. Service and Repair .
- 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 SEE DTC Logic.
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 SEE DTC Logic.
Is the DTC U1024 displayed again?
YES - GO TO 6.
NO - INSPECTION END
6.REPLACE ECM
Replace ECM. Service and Repair.
- INSPECTION END