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 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. The most common symptoms of a failed FICM are: NO START or CONSTANT MISFIRE AT ALL ENGINE TEMPERATURES. Symptoms other than these are not likely to be caused by the FICM module.
Download pdf document:
http://www.ford-trucks.com/ford-manuals/6.0L%20Fuel%20Injection%20Control%20Module%20Tech%20Guide.pdf
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