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.
   CONTINUITY REFERENCE TABLE
   
   

   ECM		VVEL control module		Continuity
   Connector	Terminal	Connector	Terminal
   F111	89	E16	24	Existed
   M160	93		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 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.

Refer to INTERMITTENT INCIDENT .

Is the inspection result normal? 

YES: GO TO  4.

NO: Repair or replace.

1. Replace VVEL control module.
2. Perform ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL MODULE): SPECIAL REPAIR REQUIREMENT .

   GO TO  5.

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 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 DTC LOGIC .

   Is the DTC U1024 displayed again? 

   YES: GO TO  6.

   NO: INSPECTION END

1. Replace ECM.
2. Go to ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM): SPECIAL REPAIR REQUIREMENT .

   INSPECTION END