Ignition Coil: Description and Operation

Ignition Coil Assembly:

The ignition coils have a pair of high voltage output terminals that provide spark to two engine cylinders (spark plugs) at the same time. The #1 ignition coil supplies voltage to the spark plugs in engine cylinders 1 and 4. The #2 ignition coil supplies voltage to the spark plugs in engine cylinders 2 and 3. Each ignition coil assembly has a built-in ignition module, igniter, that controls the current flow in the primary coil winding. The secondary coil voltage travels simultaneously from both coil output terminals to the spark plugs.