P1078

P1078 EVT CONTROL POSITION SENSOR

DTC Logic


DTC DETECTION LOGIC







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.
- 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 .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect exhaust valve timing (EVT) control position sensor harness connector.
3.Turn ignition switch ON.
4.Check the voltage between EVT control position sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK SENSOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check harness connector for short to power and short to ground, between the following terminals.





Is inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

3. CHECK EVT CONTROL POSITION SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between EVT control position sensor harness connector and ECM harness connector.





4.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.

4. CHECK EVT CONTROL POSITION SENSOR INPUT SIGNAL CIRCUIT

1.Disconnect ECM harness connector.
2.Check the continuity between EVT control position sensor harness connector and ECM harness connector.





3.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK EVT CONTROL POSITION SENSOR

Check the EVT control position sensor. .
Is the inspection result normal?
YES- GO TO 6.
NO- Replace EVT control position sensor. Removal And Installation.

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- Check intermittent incident. Intermittent Incident.
NO- Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Removal And Installation.


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.





5.Visually check the sensor for chipping.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace EVT control position sensor. Exploded View.

2. EVT CONTROL POSITION SENSOR-II

Check resistance EVT control position sensor terminals as shown below.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace EVT control position sensor. Exploded View.