Throttle Position Sensor

NOTE: The Throttle Position Sensor (TPS) is used only on vehicles equipped with an automatic transmission if equipped with a diesel engine. It is not used with the manual transmission.

Throttle Position Sensor Location:

LOCATION
The TPS is mounted on the side of the fuel injection pump. The TPS provides an input to the Powertrain Control Module (PCM). It senses how far the throttle is open (past the idle position). The PCM uses the TPS input, along with vehicle speed sensor and engine speed sensor inputs to determine 3-4 upshift (overdrive) and 4-3 downshift. It is also used with the vehicle speed sensor and engine speed sensor inputs to engage and disengage the torque convertor solenoid. This solenoid is used for torque convertor engagement.

OPERATION
The TPS is a linear potentiometer. The PCM supplies 5 volts to the sensor. TPS output to the PCM varies from approximately 1.0 volt at idle to 3.5 volts at wide open throttle (WOT).