The oil level sensor, if equipped, is located on the starboard side of the powerhead, at the base of the cylinder block. The
starboard air intake runner must be removed to access the oil level sensor.
a - Starboard air intake runner
b - Location of the oil level sensor
c - Starboard view of engine with intake runner removed
d - Top of the oil level sensor
Oil Level Sensor Test
Use the mechanical dipstick to ensure the oil level in the sump is within the standard operating range. Refer to the appropriate
Operation and Maintenance Manual or service manual for more information.
1. Use CDS G3 Live Data to read the value of the oil level sensor. The count range is 0–1024, with a normal oil level having a
value of roughly 500 counts. If the oil level is correct on the dipstick but significantly out of range on the Live Data value,
the wiring, connections, or sensor is likely at fault.
2. Disconnect the engine harness connector from the sensor.
3. Visually inspect the sensor pins and the wires coming from 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.
4. Perform a continuity check of the sensor wiring between the sensor connector and the PCM. Note that there are splices in
both the power and ground circuits.
DMT 2004 Digital Multimeter
91‑892647A01
Sensors
Page 5A-28 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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