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Home >> Pontiac >> 2003 >> Sunfire Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 2.2L >> Computerized Engine Controls >> Fuel Injector Control Module >> Communication Circuits

Communication Circuits

The PCM monitors the FICM diagnostic circuit to set FICM related DTCs. The FICM diagnostic circuit is a 5 volt circuit that is pulse width modulated by the FICM to communicate diagnostic information to the PCM.

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