Air Temperature Sensor ( Ambient / Intake ): Description and Operation

Charge Temperature Sensor:

LOCATION

The Charge Temperature sensor is mounted in the throttle body adapter at the rear of the intake manifold.


FUNCTION

The sensor element extends into the manifold airstream to measure the temperature of the air passing through the intake manifold.


OPERATION

The engine controller sends out a reference voltage of approximately five (5) volts to the coolant temperature sensor. As air temperature changes, the internal resistance of the sensor will change, causing a varying voltage drop across the sensor. The engine controller reads the voltage drop across the sensor as charge air temperature.

The engine controller uses this information to calculate the proper injector pulse width and spark advance.