Throttle Position Sensor: Description and Operation

Throttle Position Sensor Location:

OPERATION
The Throttle Position Sensor (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.

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).

CIRCUIT OPERATION
From the Powertrain Control Module (PCM), circuit K6 supplies 5 volts to the Throttle Position Sensor (TPS). Circuit K6 connects to cavity 6 of the PCM.

Circuit K22 delivers the TPS signal to the PCM. Circuit K22 connects to cavity 22 of the PCM.

The PCM provides a ground for the throttle position sensor signal (circuit K22) through circuit K4. Circuit K4 connects to cavity 4 of the PCM.