July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Diagnostic Aids
Vehicle will start and run after an extended crank because when Code 12 sets, the PCM will use the spark reference 24X pulses to control fuel delivery.
Fig 1: Code 12 Schematic (4.0L) 4X Crank Signal From IC Module
Fig 2: Code 12 Diagnostic Flow Chart (4.0L) 4X Crank Signal From IC Module