E 250 3/4 Ton Van V8-5.4L CNG VIN M (1997)
Fuel Gauge Module (CNG): Description and Operation
The Natural Gas Vehicle (NGV) module assembly:
Consists of:
a 60-pin module,
a bracket,
a marine cover and
four marine cover retainers.
It also houses the unique electronics required for natural gas fuel systems.
The NGV module assembly:
Performs the following functions:
Note: no injector calculations are performed; the injector driver output is not determined by the NGV module.
Injector drivers: the NGV module accepts eight unmodified injector signals from the powertrain control module (PCM) and allows a peak-and-sustain
current to flow through the injector solenoids.
Fuel gauge driver: the NGV module uses tank temperature and fuel tank pressure inputs to calculate the density of the fuel; a look-up table is used to
determine the output signal to the fuel gauge.
