Circuit Description
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There are 2 separate ignition module assemblies, one for each bank of cylinders. Each assembly contains an ignition control (IC) module and 4 ignition coils. Each IC module consists of the following circuits:
- The ignition 1 voltage
- A ground
- The IC timing low reference
- The IC control circuits for cylinders 1-8
Each ignition coil connects directly to its spark plug via a short boot. The IC control circuits transmit timing pulses from the powertrain control (PCM) module to the IC modules, which trigger the coils to fire the plugs in the correct sequence. The PCM monitors each IC control circuit for improper voltage levels.