Fuel Injector Driver Module (CNG): Testing and Inspection

PRINCIPLES OF OPERATION (HOW DOES IT WORK?)

The Natural Gas Vehicle (NGV) 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 carries out 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 carried out; 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.