Motronic ME 7.1.1
Quick-Start Functions
Quick-Start is accomplished through the use of the
“quick-start rotor ring“ introduced in the four-cylinder
five-valve engines.
The quick-start rotor ring is a shutter wheel with four
alternating vanes and air gaps – two wide and two
narrow.
The alternating vanes and air gaps pass the Hall
sensor in a sequence that produces a distinctive
pulse width pattern for each 90° of camshaft rotation.
The ECM uses this distinctive signal pattern from
Camshaft Position Sensor G40, together with input
from Engine Speed Sensor G28, to determine the
camshaft position relative to the crankshaft more
quickly.
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