Oil Temperature Sensor For ECM: Description and Operation

ENGINE CONTROL COMPONENTS

Engine Oil Temperature (EOT) Sensor
The EOT sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases and the resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the powertrain control module (PCM) corresponding to temperature.

The EOT sensor is located at the rear of the engine on the oil filter adapter. The EOT sensor measures the temperature of the engine coolant and provides a feedback signal to the PCM. The PCM uses the EOT sensor input to calculate fuel quantity and injection timing.

At low ambient air temperatures and an oil temperature of less than 70°C (158°F), low idle is increased to maintain stable idle quality. Fuel quantity and timing is controlled throughout the total operating range to provide adequate torque and power.