Motronic ME 7.1.1
Camshaft Position (CMP) Sensors
G40 and G163
Both Hall sensors are located in the engine timing
chain cover. Their task is to communicate the position
of the intake and exhaust camshafts to the ECM. To
do this, they scan a quick-start sensor wheel that is
located on the individual camshaft.
The ECM recognizes the position of the intake
camshaft from the CMP Sensor G40, and recognizes
the position of the exhaust camshaft from CMP
Sensor 2 G163.
G40
G163
360_108
Effects of Signal Failure
Signal Utilization
In case of signal failure, the signal from the RPM
Sensor G28 is used instead. Because the camshaft
position and the cylinder position cannot be
recognized as quickly, it may take longer to start the
engine.
Using the signal from the CMP Sensors, the precise
position of the camshaft relative to the crankshaft is
determined very quickly when the engine is started.
Used in combination with the signal from the RPM
Sensor G28, the signals from the CMP Sensors allow
to detect which cylinder is atTDC.
The fuel can be injected into the corresponding
cylinder and ignited.
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