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Home >> Chevrolet >> 1997 >> Astro Van Cargo, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing 4.3L >> Ignition System >> Circuit Description

Circuit Description

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System includes a distributor, ignition coil, ignition control module, secondary wires, spark plugs, VCM and crank sensor. Ignition system is controlled by Vehicle Control Module (VCM). The VCM monitors the information from various engine sensors, computes the desired spark timing and controls the dwell and firing of the ignition coil via an (IC) line to the ignition control module.