Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Control Actuator (FCA) is an electronically controlled solenoid valve. The Powertrain Control Module (PCM) provides a PWM driver circuit and ground circuit to the FCA. The PCM varies the current to this valve to provide the correct fuel flow to the High Pressure Pump based on operating conditions. The FCA is a normally open valve. High circuit resistance may cause fuel pressure to be higher than commanded at light loads. Although this is primarily an electrical diagnostic check, fuel supply issues and high pressure leaks can cause the PCM to force the Fuel Control Actuator into a region where this fault code becomes active. The PCM illuminates the MIL lamp and the ETC lamp immediately after the diagnostic runs and fails. During this time the customer may experience low power. The PCM turns off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles.