Ignition Coils

Fig 1: Identifying Ignition Coils

Courtesy of VOLVO CARS CORPORATION

The ignition coils supply the spark plugs with high voltage to produce sparks. The engine control module (ECM) controls the ignition coils so that sparks are generated at the correct time.

Each ignition coil has its own integrated power stage.

The ignition coils are in the sparkplug wells above each spark plug.

The engine control module (ECM) can diagnose the ignition coils.