Circuit Description

The ignition system uses individual ignition coil/module assemblies for each cylinder. The engine control module (ECM) controls the individual coils by transmitting timing pulses on the ignition control (IC) circuit of each ignition coil/module to enable a spark event. The ECM monitors each IC circuit for improper voltage levels. Each ignition coil/module has the following circuits:

• An ignition voltage circuit
• A ground
• An IC circuit
• A low reference circuit

If the ECM detects a short to ground on the IC circuit of the ignition coil/module, the corresponding DTC will set.