There is a small assembly cover on the top of the FICM, that is normally held down by two torx T20 screws. If you find that your symptoms align with the hard starts and rough running cold, then the testing may be as simple as grabbing your multimeter and a friend to help. However some tests are fairly simple using hand tools and a multimeter. There are many ways to test the FICM and some of them require specialized diagnostic equipment. Simply put, the engine will not run without the FICM, which makes this a top priority when reliability and longevity are being discussed. As you probably guessed, the logic side is what controls fuel injection timing and duration, the power side is what supplies power – 48 volts – to the two small coils on the injectors. To better visualize the FICM, you need to know that it has two ‘halves’, one half is referred to as the logic side/half and the other is the power supply side/half. There are three large electrical connections on the bottom side of the FICM, one for the engine control module (ECM) communication and the other two are connections to the eight fuel injectors. The FICM is mounted on supporting brackets above the valve cover on the driver’s side of the engine and was used on the 6.0 Power Stroke engines. The fuel injection system is quite complicated, so for an effective and definitive diagnosis it may require specialized training and/or tools.Ī 6.0 FICM or fuel injection control module is what provides power and control to the fuel injectors. This symptom can normally be traced back to a failed injector, but in some cases has proven to be a FICM logic side failure as well. Another symptom commonly seen is the engine is running rough or misfiring all of the time, or after the engine is warmed up. This may be related to either a completely failed power supply side of the FICM (20 volts or less output), or in some rare cases a failed logic side. One would be a complete no start situation where the engine cranks over, but will not run. As it relates to the FICM, there are a few other symptoms to mention. These symptoms are going to be most likely related to a power supply side failure, where the power to the injectors is inadequate or less than 48 volts. This can mean that the engine cranks over for longer than normal before firing off and/or the engine starts, but then dies and after many attempts, finally starts, but runs rough for a while.
What are the symptoms of a failing 6.0 FICM?Ī failing FICM can cause all sorts of problems, but one of the most common symptoms is an engine that is hard to get started, especially when the engine is cold or has sat overnight.