Fuel Gauge Module (CNG): Description and Operation

WARNING:
^ DO NOT MODIFY THE SYSTEM CONFIGURATION OR COMPONENTS OR REPLACE COMPONENTS WITH PARTS NOT SPECIALLY DESIGNED FOR USE WITH NATURAL GAS. FORD MOTOR COMPANY HAS SPECIALLY DESIGNED THE MATERIALS, COMPONENTS AND SYSTEM CONFIGURATION, AND EACH PARTICULAR SYSTEM IS PRECISELY CALIBRATED FOR EFFICIENT OPERATION. THE USE OF DIFFERENT PARTS OR MATERIALS CAN PRODUCE AN UNTESTED CONFIGURATION THAT COULD RESULT IN FIRE OR PERSONAL INJURY OR CAUSE ENGINE DAMAGE.
^ IT IS IMPORTANT THAT YOUR NATURAL GAS VEHICLE BE PROPERLY MAINTAINED BY FORD NATURAL GAS TRAINED PERSONNEL. IF A PROBLEM OCCURS, IT IS IMPORTANT THAT PROPERLY TRAINED PERSONNEL DIAGNOSE THE CAUSE. IF THE PROBLEM RELATES TO THE FUEL SYSTEM, PROPER PART REPLACEMENT IS IMPERATIVE TO KEEP YOUR VEHICLE OPERATING AT NORMAL PERFORMANCE. NATURAL GAS COMPONENTS AND GASOLINE FUEL COMPONENTS ARE NOT INTERCHANGEABLE. IF YOUR VEHICLE IS NOT SERVICED IN ACCORDANCE WITH NATURAL GAS-FUELED VEHICLE PROCEDURES, DAMAGE CAN OCCUR AND YOUR WARRANTY MAY BE INVALIDATED.

The Natural Gas Vehicle module assembly:
^ Consists of a 60-pin module, a bracket, a marine cover and four marine cover retainers.
^ Houses the unique electronics required for natural gas fuel systems.
^ Is located on the center radiator support, behind the radiator grille.

The NGV module assembly performs the following functions:
^ 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.

NOTE: No injector calculations are performed; the injector driver output is not determined by the NGV module.

^ 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.