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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.
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