9-5 Aero (9600) L4-2.3L Turbo (2.3HOT) (2004)
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Ignition Control Module: Description and Operation
Ignition Discharge Module
Ignition
The ignition discharge module is located on the camshaft cover above the spark plugs. It contains 4 ignition coils, the secondary winding of which are
connected to the spark plugs.
The ignition discharge module is powered with B+ from the main relay and is grounded to grounding point G7.
When the main relay operates, B+ is fed to the ignition discharge module, which converts the 12V to 400V DC and stores it in a capacitor. The 400 V is
connected to one of the poles of the primary winding on each of the 4 ignition coils.
There are 4 trigger leads running from the control module to the ignition discharge module connected as follows:
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Cylinder 1 is connected to control module pin 7.
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Cylinder 2 is connected to control module pin 54.
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Cylinder 3 is connected to control module pin 55.
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Cylinder 4 is connected to control module pin 8.
When the control module grounds pin 7, the other pole on the primary winding of the ignition coil for cylinder 1 will be connected to the B+ input on the
ignition discharge module. 400V is stepped up to maximum 40kV in the ignition coil for cylinder 1. Ignition takes place for cylinder 2, 3 and 4 in the
same way.
Diagnostics
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If there is an open circuit in the power supply to the ignition discharge module, the voltage on all the trigger leads will be 0V and diagnostic
trouble code P1310 will be generated.
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If there is an open circuit on an individual trigger lead, diagnostic trouble codes will not be generated.
System reaction to a fault
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Fuel shut-off
Combustion signals, synchronization
