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Home >> Saturn >> 2005 >> L Series V6-3.0L VIN R >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Ignition System >> Ignition Control Module >> Description and Operation
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Ignition Control Module: Description and Operation




IGNITION CONTROL MODULE

Each ICM has the following circuits:
- An ignition voltage circuit
- A ground
- Three control circuits, one for each ignition coil

The ECM can command each ignition coil ON by grounding the control circuit of the ignition coil. The control circuit is pulse width modulated ON/OFF in order to precisely control the spark event.

The spark plugs are connected to each coil by a short boot. The boot contains a spring that conducts the spark energy from the coil to the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
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