Nissan Sentra Service Manual: P0520 EOP System

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0520 EOP System

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0520	EOP SENSOR/SWITCH (Engine oil pressure sensor/ switch circuit)	ECM detects the following status continuously for 5 seconds or more: A voltage signal transmitted from the engine oil pressure sensor is lower than 0.3 V. A voltage signal transmitted from the engine oil pressure sensor is higher than 5.02 V.	Harness or connectors (EOP sensor circuit is open or shorted) EOP 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.CHECK ENGINE OIL LEVEL

Turn ignition switch OFF.
Check engine oil level. Refer to LU-7, "Inspection".

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

NO >> Check engine oil leak. Refer to LU-6, "Engine Lubrication System Schematic".

3.PERFORM DTC CONFIRMATION PROCEDURE

Start engine and let it idle for at least 5 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-340, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK EOP SENSOR POWER SUPPLY CIRCUIT-1

Turn ignition switch OFF.
Disconnect EOP sensor harness connector.
Turn ignition switch ON.
Check the voltage between EOP sensor harness connector terminals.

Is the inspection result normal?

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

NO >> GO TO 4.

2.CHECK EOP SENSOR SIGNAL CIRCUIT

Turn ignition switch OFF
Disconnect ECM harness connectors.
Check the continuity between EOP sensor harness connector and ECM harness connector.

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

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

NO >> Repair or replace error-detected parts.

3.CHECK EOP SENSOR

Check EOP sensor. Refer to EC-342, "Component Inspection (EOP Sensor)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace EOP sensor. Refer to EM-94, "Exploded View".

4.CHECK EOP SENSOR POWER SUPPLY CIRCUIT-2

Check the voltage between EOP sensor harness connector terminal and ground.

Is the inspection result normal?

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

NO >> GO TO 5.

5.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.

6.CHECK EOP SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between EOP sensor harness connector and ECM harness connector.

Is the inspection result normal?

Is the inspection result normal? YES >> GO TO 7.

NO >> Repair or replace error-detected parts.

7.CHECK ECM GROUND CIRCUIT

Check the continuity between ECM harness connector and ground.

Is the inspection result normal?

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Repair or replace error-detected parts.

Component Inspection (EOP Sensor)

1.CHECK EOP SENSOR

Turn ignition switch OFF.
Disconnect EOP sensor harness connector.
Check the resistance between EOP sensor connector terminals.

Is the inspection result normal?

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace EOP sensor. Refer to EM-94, "Exploded View".

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