Chapter 8 Ignition System Fundamentals 145 Copyright by Goodheart-Willcox Co., Inc. Figure 8-1. Ignition system schematics. A—A coil-on-plug ignition system. B—A waste-spark ignition system. C—A distributor-type ignition system. Note the dotted line distinguishing the secondary circuit in each schematic. (Goodheart-Willcox Publisher) Coil packs Spark plug Spark plug Spark plug ECM B A C Ignition switch Battery Camshaft position sensor Crankshaft position sensor Ignition module ECM Battery Camshaft position sensor Crankshaft position sensor Ignition module Ignition module Ignition switch ECM Battery Ignition switch Internal coil and spark plug assembly Distributor Crankshaft position sensor Signal rotor Distributor rotor Ignition coil