Copyright Goodheart-Willcox Co., Inc. 218 • Ignition timing in modern vehicles is controlled by the ECM based on input data it receives from a variety of electronic sensors and components. • For correct ignition timing, each cylinder should receive a spark at the plug electrodes as the piston nears the top of its compression stroke (a few degrees before TDC). • Engine speed and load create a need to advance or retard ignition timing. Technical Terms advanced battery coil-near-plug ignition system coil-on-plug (COP) ignition system direct ignition system directional spark plugs distributor distributor cap distributor ignition system distributor rotor distributorless ignition system dual coil-on-plug ignition system electronic ignition systems field collapse flashover Hall-effect switch heat range ignition switch ignition timing light-emitting diode (LED) magnetic field magnetic pickup sensors optical sensor pencil ignition coils photosensitive diode plug gap polarity power transistor primary circuit primary windings projected-nose spark plug reluctor resistor resistor spark plugs retarded secondary circuit secondary windings self-induction spark plug spark plug electrodes spark plug insulators spark plug shell spark plug wires trigger wheel triggering devices waste spark waste spark ignition system Review Questions Answer the following questions using the information provided in this chapter. 1. What is the maximum voltage that some modern electronic ignition systems can produce? (A) 20,000 (B) 50,000 (C) 60,000 (D) 100,000 2. All of the following ignition system components are part of the primary ignition circuit, except: (A) ignition switch. (B) spark plugs. (C) ignition control module. (D) battery. 3. What controls electricity flow through the primary ignition circuit? (A) Ignition switch. (B) Voltage relay. (C) Secondary windings. (D) Distributor. 4. What is the primary job of the ignition coil? (A) Convert low voltage to high voltage. (B) Convert high voltage to low voltage. (C) Reduce primary voltage. (D) Reduce secondary voltage.
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Copyright Goodheart-Willcox Co., Inc. 218 • Ignition timing in modern vehicles is controlled by the ECM based on input data it receives from a variety of electronic sensors and components. • For correct ignition timing, each cylinder should receive a spark at the plug electrodes as the piston nears the top of its compression stroke (a few degrees before TDC). • Engine speed and load create a need to advance or retard ignition timing. Technical Terms advanced battery coil-near-plug ignition system coil-on-plug (COP) ignition system direct ignition system directional spark plugs distributor distributor cap distributor ignition system distributor rotor distributorless ignition system dual coil-on-plug ignition system electronic ignition systems field collapse flashover Hall-effect switch heat range ignition switch ignition timing light-emitting diode (LED) magnetic field magnetic pickup sensors optical sensor pencil ignition coils photosensitive diode plug gap polarity power transistor primary circuit primary windings projected-nose spark plug reluctor resistor resistor spark plugs retarded secondary circuit secondary windings self-induction spark plug spark plug electrodes spark plug insulators spark plug shell spark plug wires trigger wheel triggering devices waste spark waste spark ignition system Review Questions Answer the following questions using the information provided in this chapter. 1. What is the maximum voltage that some modern electronic ignition systems can produce? (A) 20,000 (B) 50,000 (C) 60,000 (D) 100,000 2. All of the following ignition system components are part of the primary ignition circuit, except: (A) ignition switch. (B) spark plugs. (C) ignition control module. (D) battery. 3. What controls electricity flow through the primary ignition circuit? (A) Ignition switch. (B) Voltage relay. (C) Secondary windings. (D) Distributor. 4. What is the primary job of the ignition coil? (A) Convert low voltage to high voltage. (B) Convert high voltage to low voltage. (C) Reduce primary voltage. (D) Reduce secondary voltage.
