3500 4x2 Pickup L6-359 5.9L DSL Turbo (1994)
Throttle Position Sensor: Description and Operation
Throttle Position Sensor Location
LOCATION
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. The TPS is mounted on the side of the fuel injection pump.
OPERATION
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.
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).
