Description And Operation: Operation

• 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.
• The PCM will de-energize the ASD relay if it does not receive the crankshaft position sensor and camshaft position sensor inputs

For ignition standard diagnostics, please. Refer to DIAGNOSIS AND TESTING .