Throttle Position Sensor: Description and Operation

Throttle Position Sensor:

PURPOSE
The sensor is a variable resistor (potentiometer) that is used by the ECM to detect throttle movement and position.

LOCATION
The throttle angle sensor is mounted on and driven by the throttle body unit.

CONSTRUCTION
The sensor is a variable resistor (potentiometer) that is used by the ECM to detect throttle movement and position.

OPERATION
A 5 volt reference signal is applied from the ECM and a ground signal. When the throttle is opened the sensor resistance changes which is read as a varying voltage signal. At idle position the sensor voltage is approx. 0.5V and approx. 4.5 V at full throttle.