Question

While having a discussion, Technician A says that a coolant position sensor attached to the throttle body on the air inlet senses how many degrees the throttle plate is open. Technician B says that an air charge temperature sensor senses how many degrees the throttle plate is open. Who is correct? A only, B only, Both A and B, Neither A nor B

Answer 1

Neither A nor B

Explanation:

There is no thing as coolant position sensor. We have either throttle position sensor (TPS) or Coolant Temperature Sensor (CTS). TPS is a sensor used to monitor throttle position of a vehicle. It is located on butterfly shaft to measure throttle position directly. So yes TPS cab be used for the purpose. CTS (or ETS) is a sensor used to measure cooolat temperature in cooling system indicating how much heat engine is giving off.

Air charge (or manifold) temperature sensor used by ECU to measure air density for fuel mixture control. This is used to supply air fuel ratio according to air density. It is located in inlet manifold or integrated into MAF sensor. So this sensor also cannot measure throttle plate degrees.