F 350 4WD Pickup V8-7.3L DSL Turbo VIN F (1994)
Throttle Position Sensor/Switch: Description and Operation
Fuel Injector Pump Lever (FIPL) Sensor
Description
The Throttle Position or Fuel Injection Pump Lever (FIPL) sensor is a potentiometer attached to the fuel injection pump and is operated by the
throttle lever.
Operation
The FIPL sensor is incorporated to provide an electrical signal, which is proportional to the amount of fuel being delivered, as an input to the
Transmission Electronic Control Assembly (TECA). Based on this information, the FIPL sensor provides the proper shift scheduling and torque
capacity.
High-Capacity Operating Mode
Should a malfunction occur in the FIPL sensor circuit, the electrical signal sent to the TECA will be recognized as erroneous. When this
out-of-specification signal is detected, the TECA will provide a high-capacity operating mode that protects the transmission from potential
damage. This operating mode includes maximum Throttle Valve (TV) pressure, resulting in harsh upshifts and engagements and a singular shift
schedule regardless of accelerator pedal position, resulting in the 1-2, 2-3 and 3-4 shifts occurring at a speed commensurate with a heavy (but not
wide open) throttle setting.
