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Home >> GMC >> 1991 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline) >> Input Devices >> Crank Signal
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Crank Signal

Crank signal is a 12-volt signal monitored by the ECM. Signal is present when ignition switch is in the START position. The ECM uses signal to determine the need for starting enrichment. ECM also cancels diagnostics until engine is running and 12-volt signal is no longer present.

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