Ignition Coil: Description and Operation

IGNITION COIL
The coil assemblies for this engine are mounted on the intake manifold. They are coil on plug assemblies and each cylinder has an ignition coil assembly.

The Auto Shutdown (ASD) relay provides battery voltage to the ignition coil. The PCM provides a ground contact (circuit) for energizing the coil. When the PCM breaks the contact, the magnetic energy in the coil transfers to the secondary causing the spark. The PCM will de-energize the ASD relay if it does not receive the crankshaft position sensor and camshaft position sensor inputs. Refer to Auto Shutdown (ASD) Relay-PCM Output, for relay operation.

IGNITION COIL CAPACITOR
There is a coil capacitor added to each bank of cylinders for radio noise suppression.