Do timing control modules have coils in the module to control ignition timing?

• A. Yes
• B. No
• C. Sometimes
• D. Not Applicable

Answer: (B)

Ignition timing is controlled by an electronic signal, not by the coil itself. The timing control module provides the precise timing signals that trigger the ignition coils or coil packs; the coils are the separate components that generate the high voltage for the spark plugs. Because of this separation of duties, the timing control module does not contain the ignition coil windings. You’ll see coils mounted separately (or as coil packs/coil-on-plug units) while the timing logic sits in the module or engine computer. So the correct understanding is that timing control modules do not have coils inside them.