Nissan Sentra Service Manual: P0197, P0198 EOTSensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0197, P0198 EOTSensor

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0197	EOT SEN/CIRC (Engine oil temperature sensor circuit low)	An excessively low voltage from the engine oil temperature sensor is sent to ECM.	Harness or connectors (EOT sensor circuit is open or shorted.) Engine oil temperature sensor
P0198	EOT SEN/CIRC (Engine oil temperature sensor circuit high)	An excessively high voltage from the engine oil temperature sensor is sent to ECM.

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 wait at least 5 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-264, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK ENGINE OIL TEMPERATURE SENSOR POWER SUPPLY

Turn ignition switch OFF
Disconnect engine oil temperature (EOT) sensor harness connector.
Turn ignition switch ON.
Check the voltage between EOT 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 ENGINE OIL TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

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

Also check harness for short to ground.

Is the inspection result normal? YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace error-detected parts.

3.CHECK EOT SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Check the continuity between EOT 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 ENGINE OIL TEMPERATURE SENSOR

Check the engine oil temperature sensor. Refer to EC-265, "Component Inspection (EOT Sensor)".

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

NO >> Replace engine oil temperature sensor. Refer to EM-94, "Exploded View".

Component Inspection (EOT Sensor)

1.CHECK ENGINE OIL TEMPERATURE SENSOR

Turn ignition switch OFF.
Disconnect engine oil temperature sensor harness connector
Remove engine oil temperature sensor.
Check resistance between engine oil temperature sensor terminals by heating with hot water as shown in the figure.

Is the inspection result normal?

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace engine oil temperature sensor. Refer to EM-94, "Exploded View".

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