Ignition Coil

An ignition coils are used with each spark plug and are mounted on the spark plug (coil over).

• The Auto Shutdown (ASD) relay provides battery voltage to the ignition coil.
• The PCM provides a ground path with an internal Low Side Driver (LSD).
• When the PCM opens the LSD, the ground path is broken and the energy in the coil primary re-energizes.
• The PCM will de-energize the ASD relay if it does not receive the crankshaft position sensor and camshaft position sensor inputs.