9-5 Linear Sport Wagon (9600) L4-2.3L Turbo (B235) (2002)
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 12 V to 400 V 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. 400 V is stepped up to maximum 40 kV 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 0 V 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