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Home >> Buick >> 1988 >> Regal Custom >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Ignition System - Direct >> Operation >> Ignition Reference Signal
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Ignition Reference Signal

The crankshaft position sensor sends a signal to the DIS ignition module which results in a reference signal being sent to the ECM. The ECM uses this signal to calculate the crankshaft position, engine RPM and injector pulse width.