F 250 4WD Pickup V8-7.3L DSL Turbo VIN K (1994)
Throttle Position Sensor: Description and Operation
DESCRIPTION
The Fuel Injection Pump Lever (FIPL) sensor provides an electrical signal, which is proportional to the amount of fuel being delivered, as an
input to the Transmission Electronic Control (TEC) Processor. Based on this information, the TEC Processor provides the proper shift scheduling
and torque capacity.
OPERATION
Should a malfunction occur in the FIPL sensor circuit, the electrical signal sent to the TEC Processor will be recognized as erroneous. When this
out-of-specification signal is detected, the TEC Processor will provide a high capacity operating mode that protects the transmission from potential
damage. This operating mode includes the following:
1. Maximum Throttle Valve (TV) pressure, resulting in harsh upshifts and engagements.
2. 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.
