Ignition coils

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Fig 1: Identifying Ignition Coil

Courtesy of VOLVO CARS OF NORTH AMERICA.

The ignition coils ignite the fuel / air mixture on command from the engine control module (ECM). The signal is re-transmitted so that the control module knows that it worked.

Each ignition coil has its own integrated power stage.

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

The ignition windings can be diagnosed by the Engine control module (ECM) and can be activated using VIDA.