Ignition Coil Primary Circuits (#1, #3, and #5)

NAME OF CODE
Ignition Coil Primary Circuit (Circuits #1 #3 and #5)

WHEN MONITORED
With battery voltage greater than 8 volts during engine cranking or greater than 12 volts with engine running, and with engine RPM less than 2016, and none of the coils in dwell when checked.

SET CONDITION
Peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. It takes less than 3 seconds during cranking or up to 6 seconds while running to set.

THEORY OF OPERATION
The ignition coil is supplied 12 volts from the Automatic Shutdown (ASD) relay. The Powertrain Control Module (PCM) controls the individual primary circuits. Cavity 17 controls primary circuit #3, which fires spark plugs 8 & 9. Cavity 18 controls primary circuit #5, which fires spark plugs 2 & 3. Cavity 19 controls primary circuit #1, which fires spark plugs 1 & 6. The amount of dwell time is based on crankshaft speed and camshaft position.

POSSIBLE CAUSES
- Open or shorted ignition coil driver circuit
- Open ignition coil primary
- Open ASD output circuit
- Failed PCM