2000 AUDI A3 spark

28-3
Technical data

Engine identification
ATW (1.8 L / 5V/ 110 kW engine)
Idle speed
Engine speed cannot be adjusted, it is
regulated by idle stabilization Front Wheel Drive (FWD): 740 to 860 RPM
All-Wheel Drive Vehicles: 800 to 920 RPM
Engine speed (RPM) limitation
Via fuel injector shut-off
about 6800 RPM
Ignition timing is determined in the control
module
It is not possible to adjust the ignition
timing
Ignition system Single coil ignition system with 4 ignition coils (power output stages integrated)
that are connected directly to spark plugs via the ignition cables.
Spark plugs Tightening torque 30 Nm.
Firing sequence 1-3-4-2
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Test sequence

Note:
The ignition coil and power output stage are
combined in one complete component.

Recognize a non-functional or misfiring cylinder as follows:
If misfires were recognized:
If no misfires were recognized:
or
If faulty cylinder is recognized: - Remove engine cover (arrows).
- Check misfire recognition Page 28
-51
.
- Continue with test at indicated cylinder "If faulty cylinder is
recognized". - Disconnect connectors from fuel injectors in sequence with engine
running and observe engine operation.
- Compare spark plugs from all cylinders to each other. Check
electrodes for carbon fouling..
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- Switch spark plug from faulty cylinder with one from another cylinder.
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If malfunction follows the spark plug:

- Replace spark plug.
If malfunction remains at original cylinder:

- Switch ignition coil from faulty cylinder with one
from another cylinder.
If malfunction follows the ignition coil:

- Replace ignition coil.

Check Ground (GND) connection

- Disconnect 4-pin harness connector -1- at ignition coil -2-.
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Component location Overview of component
locations Page 24
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The Camshaft Position (CMP) sensor provides
the ignition position for cylinder 1.
For failure, knock control is switched off and the
ignition angle is retarded slightly since a cylinder
allocation is no longer possible. In addition, the
boost pressure of the turbocharger is decreased.
Engine will continue to run without Camshaft
Position (CMP) sensor signal and can also be
restarted:

When a malfunction is recognized, the Engine
Control Module (ECM) initiates one ignition
spark per cylinder for each crankshaft rotation.
The offset of one engine rotation will have no
noticeable effect on the injection. Instead of
occurring with intake valves open, injection will
be "pre-loaded" (in front of closed intake valve).
This has only a minor effect on the quality of the
mixture preparation.
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Evaluation display group 014, display field 3 and display group 015 and 016, display fields 1, 2 and 3. Display field:
3
Possible cause
Corrective action
Larger than 0

spark plug faulty
spark plug connector faulty
Ignition coil or power output stage
faulty - Check spark plugs and ignition wires with connector
- Ignition coils with power output stages. Checking Page
28
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Fuel injector faulty- Check fuel injectors Page 24
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