Ford Transit 2002 Owner's Manual page 1023

LPG Select Switch
The LPG select switch is located in the center console. The switch outputs a 12 volt signal to
the alternative fuel control module which opens the LPG fuel shutoff solenoid inside the fuel
vaporizer and the fuel tank solenoid valve inside the fuel tank. An integrated light emitting
diode indicator (LED) is illuminated when the switch is activated. The LPG select switch will
not illuminate if the vehicle is running on petrol.
LPG Fuel Injectors
The sequential LPG fuel injectors are located on the underside of the intake manifold and
are controlled by the LPG alternative fuel control module.
LPG Fuel Vaporizer
The LPG fuel vaporizer changes liquid gas from the LPG tank to a dry gas. The vaporizer is
connected to the engine coolant system and will only switch to LPG if the coolant
temperature is above 10 degrees centigrade.
Alternative Fuel Control Module
The alternative fuel control module monitors the various engine sensors when the vehicle is
operating on LPG. If the LPG fuel tank runs dry or the engine is operating on a weak fuel
mixture the alternative fuel control module will pick up a signal from the heated oxygen
sensor (HO2S) and switch the vehicle to petrol operation.
LPG Fuel System DLC
The LPG fuel system is diagnosed through a separate DLC. WDS connects to this DLC and
will diagnose any alternative fuel system concerns. The DLC is located in the glove
compartment area.
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