Possible Causes

WARNING: This page is about a different car, the 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes are:

Open or short in IGN START/ON (RUN) circuit.
Open coil driver circuit in harness.
Coil driver circuit shorted to ground in harness.
Coil driver circuit shorted to PWR.
Damaged ignition coil.
Damaged PCM.