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Home >> Buick >> 1987 >> Skylark Limited, 3.0 L >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - Direct Ignition System (Dis) >> Operation >> Dis Reference Signal
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Dis Reference Signal

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