DTC Diagnosis Procedure

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.

   ECM		VVEL control module		Continuity
   Connector	Terminal	Connector	Terminal
   E20	137	F56	24	Existed
   	138		11

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.

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.

Refer to Inspection .

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace.

1. Replace VVEL control module.
2. Perform additional service when replacing VVEL control module. Refer to Work Procedure .

GO TO 5.

WITH CONSULT

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select "SELF DIAGNOSTIC RESULT" mode with CONSULT.
4. Touch "ERASE".
5. Perform DTC Confirmation Procedure.

   Refer to DTC Description .

WITH GST

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select Service $04 with GST.
4. Perform DTC Confirmation Procedure.

   Refer to DTC Description .

Is the DTC U1024 displayed again?

YES

GO TO 6.

NO

INSPECTION END

1. Replace ECM.
2. Perform additional service when replacing ECM. Refer to Work Procedure .

INSPECTION END