Throttle Position Sensor

NOTE: The Throttle Position Sensor (TPS) is used only on diesel powered engines equipped with an automatic transmission and/or an EGR system.

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 volts at idle to 3.2 to 3.9 volts at wide open throttle (WOT).