Nissan Sentra Service Manual: P1078 EVT Control position sensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P1078 EVT Control position sensor

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P1078	EXH TIM SEN/CIRC-B1 (Exhaust valve timing control position sensor circuit bank 1)	An excessively high or low voltage from the sensor is sent to ECM.	Harness or connectors (Exhaust valve timing control position sensor circuit is open or shorted) Accumulation of debris to the signal pick-up portion of the camshaft Exhaust valve timing control position sensor Sensor power supply 2 circuit

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

Start engine and let it idle for 10 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-359, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

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

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

Is the inspection result normal?

Is the inspection result normal? YES >> GO TO 3.

NO >> GO TO 2.

2.CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Check sensor power supply 2 circuit. Refer to EC-444, "Diagnosis Procedure".

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

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

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

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

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. Refer to EC-360, "Component Inspection (EVT Control Position Sensor)".

Is the inspection result normal? YES >> GO TO 6.

NO >> Replace EVT control position sensor. Refer to EM-60, "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. Refer to GI-39, "Intermittent Incident".

NO >> Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to EM-60, "Removal and Installation".

Component Inspection (EVT Control Position Sensor)

Component Inspection (EVT Control Position Sensor)

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

Turn ignition switch OFF.
Disconnect EVT control position sensor harness connector.
Loosen the fixing bolt of the sensor.
Remove EVT control position sensor.
Visually check the sensor for chipping.

Is the inspection result normal? YES >> GO TO 2.

NO >> Replace EVT control position sensor. Refer to EM-60, "Removal and Installation".

2.EVT CONTROL POSITION SENSOR-2

2.EVT CONTROL POSITION SENSOR-2

Check resistance EVT control position sensor terminals as shown below.

Is the inspection result normal?

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace EVT control position sensor. Refer to EM-60, "Removal and Installation".

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