Ignition Coils
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
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 spark plug wells above each spark plug.
The ignition windings can be diagnosed by the Engine control module (ECM) and can be activated using VIDA.