Malaguti SPIDER MAX GT 500 Manual Diagnóstico página 210

SPIDER MAX 500
13. RPM SENSOR
Sch. 7
The sensor allows detecting the engine rpm and the angular inclination of the engine shaft with
respect to the TDC. As the phonic wheel is splined to the camshaft, it is possible to detect the 4-
stroke cycle. This allows controlling the injector and the spark plug every 2 revolutions on the
engine shaft. The sensor is of the reluctance change type, and it can thus be compared to an
alternating voltage generator supplying the central unit. The signal frequency is interrupted by the
vacuum created by the two missing teeth on the phonic wheel.
F. 58
The sensor signal is necessary to start the engine but the engine can operate also with an unstable
signal, thanks to corrective interventions to the central unit.
The injection led does not turn on in case the rpm signal is missing. When the signal anomaly (open
circuit) occurs while using the motorcycle on the road, the led signals the beginning of the anomaly,
blinking as follows:
A Led on
B Led off
F. 59
LED ON
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CENTRAL UNIT
LED OFF
84 12/04
Central unit ground
+ 12v
dashboard
from
immobilizer
B
Engine
revolution
sensor