P1078

P1078 EVT CONTROL POSITION SENSOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
If DTC P0340 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
"DTC Logic" P0643.






DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10.5 V with ignition switch ON.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and let it idle for 10 seconds.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" P0340.
NO- INSPECTION END


Diagnosis Procedure


1. CHECK GROUND CONNECTION

1.Turn ignition switch OFF.
2.Check ground connection E15. Refer to Ground Inspection in "Circuit Inspection" Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.

2. CHECK EXHAUST CAMSHAFT POSITION SENSOR POWER SUPPLY CIRCUIT

1.Disconnect exhaust camshaft position sensor harness connector.
2.Turn ignition switch ON.
3.Check the voltage between exhaust camshaft position sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair open circuit or short to ground or short to power in harness or connectors.

3. CHECK EXHAUST CAMSHAFT POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connectors.
3.Check the continuity between exhaust camshaft position sensor harness connector and ECM harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK EXHAUST CAMSHAFT POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Check the continuity between exhaust camshaft position sensor harness connector and ECM harness connector.





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair open circuit or short to ground or short to power in harness or connectors.

5. CHECK EXHAUST CAMSHAFT POSITION SENSOR

Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 6.
NO- Replace exhaust camshaft position sensor. Refer to "Exploded View" Exploded View.

6. CHECK CAMSHAFT (EXT)

Check the following.





- Accumulation of debris to the signal plate of camshaft rear end
- Chipping signal plate of camshaft rear end
Is the inspection result normal?
YES- GO TO 7.
NO- Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to "Removal and Installation" Removal And Installation.

7. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END


Component Inspection


1. EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR-I

1.Turn ignition switch OFF.
2.Disconnect EVT control position sensor harness connector.
3.Loosen the fixing bolt of the sensor.
4.Remove the sensor. Refer to "Exploded View" Exploded View.





5.Visually check the sensor for chipping.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace camshaft position sensor. Refer to "Exploded View" Exploded View.

2. CHECK CAMSHAFT POSITION SENSOR-II

Check resistance camshaft position sensor terminals as follows.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace camshaft position sensor. Refer to "Exploded View" Exploded View.