F 550 2WD Super Duty V8-7.3L DSL Turbo VIN F (2002)
Accelerator Pedal Position Sensor: Description and Operation
Electronic Throttle Control (ETC)
Electronic Throttle Control (ETC) - All, Except E-Series
The Electronic Throttle Control (ETC) combines the accelerator pedal sensor and idle validation switch into a single unit. The AP function provides
the PCM with the driver's demand for power. The ETC sensor portion is a three-wire potentiometer that receives VREF from the PCM and returns a
signal to the PCM directly proportional to the accelerator pedal position. The ETC signal is used in calculating fuel quantity. Also, the ETC input is
used by the PCM to control the exhaust back-pressure regulator (EBP system is not used on F-Series 650/750).
The idle validation function verifies when the accelerator pedal is in the idle position. This switch protects against in-range failure of the ETC sensor.
A PCM detected fault of the ETC sensor will illuminate the Malfunction Indicator Lamp in the instrument cluster. An ETC signal that is detected out
of range, high or low, will cause the PCM to only allow the engine to operate at low idle.
