Oil Pressure Sensor Installation
1. Ensure that the O‑ring is in good condition and is installed on the sensor.
2. Install the oil pressure sensor into the engine.
3. Tighten the sensor to the specified torque.
Description Nm lb‑in. lb‑ft
Oil pressure sensor 15 132.8 –
4. Connect the engine harness to the sensor.
Oil Temperature Sensor
The oil temperature sensor is a thermistor immersed in the engine oil passageway. It supplies the PCM with engine oil
temperature information. Low oil temperature produces high resistance, while high temperature causes low resistance. Outside
air temperature and the temperature of the water that the engine is operating in will directly affect the engine oil temperature.
The oil temperature sensor is located next to the oil filter, near the top of the port side of the engine.
Port top view of engine (V8 shown, V6
similar)
a - Oil temperature sensor
b - Oil filter
Oil Temperature Sensor Test
Monitor the oil temperature (data item OilTemp) on the CDS G3 Live Data screen. With the engine not running and cold, the oil
temperature should be approximately the same as the ambient air temperature. After the engine is started, the temperature
sensor should indicate a rise in oil temperature to approximately 75–110 °C (167–230 °F).
CDS G3 Interface Kit
8M0138392
If the oil temperature sensor does not indicate a temperature change, shake or move the sensor harness and connector. If the
temperature begins to change, look for a broken, loose, or corroded wire.
Continue testing with the engine OFF:
1. Disconnect the engine harness connector from the sensor.
2. Visually inspect the sensor pins and the wires to the engine harness connector. Look for broken, bent, or corroded pins at
the sensor and loose, broken, or corroded wires at the engine harness connector.
3. Test the sensor with an ohmmeter.
a. Disconnect the engine harness connector from the sensor and remove the sensor.
b. Immerse the tip of the sensor in a controlled temperature medium. If the readings do not match those in the table,
replace the sensor and retest.
a -
Pin A—ground (–)
b - Oil temperature sensor
c - Pin B—oil temperature signal (+)
Sensors
Page 5A-32 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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