stop AUDI A3 1999 8L / 1.G ATW Engine Ignition System Workshop Manual

28-27
Component location Overview of component
locations Page 24
-5

Note:
The engine speed (RPM) sensor detects RPM
and reference marks. The engine cannot be
started without a signal from the engine speed
(RPM) sensor -G28-. If the engine speed (RPM)
sensor -G28- signal fails while the engine is
running, the engine will stop immediately.

Test sequence

- Before performing test, check sensor for proper
installation and proper fitting.

Note:
Coolant reservoir screws must be removed and coolant reservoir must be
placed to side in order to access the harness connector. The coolant
hoses can remain connected. - Disconnect harness connector for engine speed (RPM) sensor -G28-
(item no. 3) in engine compartment.
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28-40

Knock recognition control stop,
checking

If a DTC is stored regarding "Knock control
regulation limit reached":

- Perform following tests:

Possible cause
Corrective action
DTC for all cylinders

Poor fuel quality
Operating instructions - Change fuel quality
or
Cylinder 1/2 or 3/4
Knock sensor tightened to incorrect torque- Loosen knock sensors and tighten to 20 Nm

Knock sensor faulty- Check knock sensor Page 28
-41


Corrosion at harness connector- Check harness connector

Engine accessories loose- Secure engine accessories
DTC for one Cylinder
Engine damage- Check compression pressure

Engine accessories loose- Secure engine accessories
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