3. Remove the sensor from the exhaust manifold.
a - Engine coolant temperature sensor
b - Cable tie
c - Sensor harness connector
d - Top of the exhaust manifold
ECT Sensor Installation
NOTE: Refer to the preceding illustration, as required.
1. Ensure that the O‑ring is in good condition and is installed on the sensor.
2. Install the engine coolant temperature sensor into the exhaust manifold.
3. Tighten the sensor to the specified torque.
Description
Nm lb‑in. lb‑ft
Engine coolant temperature sensor 15 132.8 –
4. Connect the sensor harness to the engine harness.
5. Secure the sensor harness connector to the engine harness with a cable tie.
Exhaust Gas Temperature (EGT) Sensor
The exhaust gas temperature (EGT) sensor is a thermistor inserted into the exhaust gas stream. The sensor provides exhaust
temperature information to the PCM.
The EGT sensor is located in the lower port side of the exhaust manifold, above the lower exhaust tube and below the electrical
panel.
a - Electrical panel
b - EGT sensor
c - View with items removed for clarity
d - Lower exhaust tube (typical)
EGT Sensor Test
Monitor the exhaust gas temperature (data item EGT) on the CDS G3 Live Data screen. With the engine cold and not running,
exhaust gas temperature should be approximately the same as the ambient air temperature. After the engine is started, the
temperature sensor should indicate a rise in temperature.
Sensors
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5A-19