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Home >> Geo >> 1989 >> Metro Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation >> Computerized Engine Controls >> Input Devices >> Engine Start Signals
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Engine Start Signals

Engine start signal, sent from starter circuit, is used by ECM to determine whether engine is cranking or not. Based on this determination, ECM calculates fuel injection timing, ISC solenoid valve operation, throttle opener and Positive Temperature Coefficient (PTC) operation (Tracker A/T).

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