Tracker 4WD L4-2.0L VIN C (1999)
Throttle Position Sensor: Description and Operation
Throttle Position (TP) Sensor
Throttle Position (TP) Sensor
The Throttle Position (TP) sensor (1) is located on the side of the throttle body. The TP sensor detects the throttle valve opening. The TP sensor is a
potentiometer. The potentiometer is connected to the throttle valve shaft on the throttle body and is responsible for sending the throttle position signal to
the Powertrain Control Module (PCM).
A 5 volt reference voltage is applied to the TP sensor from the PCM. The voltage reading at the PCM changes as the throttle plate opening increases.
The PCM can calculate the throttle valve opening by monitoring the TP sensor output voltage.
The PCM uses the TP sensor signal for one of the inputs in order to control the fuel injector, the idle speed control motor, the exhaust gas recirculation
solenoid valve and ignition timing control. The PCM also converts the TP sensor voltage input into an ON/OFF signal for use by the automatic
transmission.
