Engine Temperature Sensor: Description and Operation

ENGINE TEMPERATURE SENSOR



The Boxster's engine temperature sensor is a double NTC. It comprises the sensor housing with two resistors and a new plug contact.

One temperature resistor (resistance can be measured between contact 2 and 3 in the plug housing) supplies the signal used to display the coolant temperature on the instrument cluster. The other temperature resistor (can be measured between contact 1 and 4 in the plug housing) informs the DME control unit of the coolant temperature.

Engine Temperature Sensor:

The engine temperature sensor is bolted into the coolant duct housing.

The signal from the temperature sensor is used by the control unit to calculate the injection signal during warm-up phase in order to enrich the mixture when the engine is started, to determine the ignition angle in the warm-up phase, and to control the electric fans.