9-3 Coupe (9400) L4-2.0L Turbo (B205) (2001)
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+ wilt be 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.
NOTE: Cars equipped with T7 LEV must only be fitted with the new ignition discharge module (from MY00). The new module can, however, be used
on older model years.
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