S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
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Camshaft Position Sensor: Description and Operation
Camshaft Position Sensor
The Camshaft Position Sensor (CMP) is located behind the camshaft sprocket. The CMP sensor signal is used to recognize ignition point for cylinder
number one (1) for starting the engine. The signal is also used for cylinder selective knock control and to determine fuel injection timing and sequence.
Camshaft Position Sensor, Early Production AAN Engines
NOTE: The first AAN 20v engines are fitted with a distributor housing, in which the CMP sensor is located.
The engine cannot be started if the CMP signal is not received by the Motronic control module. If the signal fails during engine operation, the ignition
timing will be retared by 11°. In addition, the charge pressure is reduced and knock control is stopped.
