F 150 Super Crew 4WD V8-5.4L Prop SOHC VIN Z (2003)
Alternative Fuel Control Module: Description and Operation
Alternative Fuel Control Module (AFCM)
The Alternative Fuel Control Module (AFCM) is incorporated within the compuvalve and allows communication between the compuvalve and the
powertrain control module (PCM). The AFCM communicates desired operating mode, ALT or GAS, to the PCM. This allows information to be
shared between modules and facilitates troubleshooting. When ALT mode is selected and operating conditions are satisfactory, the compuvalve,
through the AFCM, signals the PCM to turn off the gasoline fuel injectors. During alternative fuel operation, if the fuel source drops below a specified
amount, the compuvalve through the AFCM signals the PCM to turn on the gasoline fuel injectors while the compuvalve shuts off alternative fuel.
This allows smooth switching of fuel systems.
