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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline) >> Input Devices >> Fuel Pump Feedback
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Fuel Pump Feedback

ECM monitors fuel pump circuit between fuel pump relay/oil pressure switch and fuel pump. This enables the ECM to determine if fuel pump is being energized by fuel pump relay or back-up oil pressure switch. A failure in this monitored circuit results in the setting of a related trouble code in ECM memory.

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