Circuit Description

The ignition system utilizes an individual module/coil for each spark plug. The following 4 circuits support each ignition module/coil assembly.

• The ignition 1 voltage circuit
• The ground circuit
• Ignition control (IC) circuit
• Low reference circuit

Each ignition module/coil connects directly to its spark plug through a wire spring conductor internal to the spark plug boot. The IC circuits transmits timing pulses from the engine control module (ECM) to each ignition module/coil assembles in the proper sequence for the spark plug firing event. The ECM monitors each IC circuit for improper voltage levels. If an improper voltage level is detected on an IC circuit a DTC will set.