DTC Diagnosis Procedure

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

Is applicable DTC detected?

YES

Perform the diagnosis of the applicable. Refer to DTC Description .

NO

GO TO 2.

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
   E77	137	F84	24	Existed
   	138		11

5. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

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.

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

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.

   See 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.

   See 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 Description .

INSPECTION END