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Electronic Spark Timing: Description and Operation
High Energy Ignition (HEI) System - PFI

The Electronic Spark Control (ESC) system module sends a voltage signal (8 to 10 volts) to the ECM when no spark knocking is detected by the ESC
knock sensor, and the ECM provides normal spark advance. When the knock sensor detects spark knock, the module turns "OFF" the circuit to the ECM
(0 volts). The ECM then retards EST to reduce spark knock. 

Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Electronic Spark Timing <--> [Electronic Spark Control Module] > Component Information > Description and Operation > High Energy Ignition (HEI) System - PFI

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