Fuel Injector Coil Test: Description

The Fuel Injector Control Module (FICM) enables the appropriate CNG fuel injector on the intake stroke for each cylinder. A voltage is supplied to the CNG fuel injectors through a pair of fuel injector relays. The FICM controls each fuel injector by grounding the control circuit via a solid state device called a driver. A fuel injector coil winding resistance that is too high, or low, will affect engine driveability. A fuel injector control circuit DTC may not set, but a misfire may be apparent. The fuel injector coil windings are affected by temperature. The resistance of the fuel injector coil windings will increase as the temperature of the fuel injector increases.