Excursion 4WD V8-6.0L DSL Turbo VIN P (2004)
Engine Control Module: Description and Operation
FICM Guide
FICM Description and Basic Operation.
A drawing of the FICM (Fuel Injection Control Module) subsystem is shown in Figure 1.
The FICM drives the fuel injector solenoids based on fuel and timing commands (via *CAN2 link) from the PCM. It uses engine speed and position
signals (*CKPO, *CMPO) to determine when the injectors need to be activated.
The ignition switch provides *KEYPWR to the FICM. Once this signal is detected by the FICM, the *MPR output of the FICM will engage the FICM
relay. This in turn provides the *FICM PWR and *FICM Logic PWR voltages to the FICM.
The FICM provides a feedback signal to the PCM indicating when the FICM is providing control signals to the injector (fueling) (via CAN2 link and
*FICMM signal).
The FICM will cycle through the injector outputs when the key is placed in the ON position. This is called pre-cycle and the time of pre-cycle varies with
engine temperature. The pre-cycle is done as a self test of the injector circuits
*See Glossary for detailed definition or explanation.
