Ignition System; Operating Principles; Magnetic Position Sensor (P); Vacuum Sensor (C) - Winnebago 1987-1989 LeSharo Service Manual

IGNITION SYSTEM
OPERATING PRINCIPLES
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(T.D.C. Sensor)
It indicates:
- the position ofthe top dead center (T.O.C.) (1) and
the position of the bottom dead center (B.O.C.)
(2),
the engine RPM.
This sensor cannot be adjusted - it is preset on its
support bracket.
FLYWHEEL (V)
There are 44 evenly spaced tooth positions around
the fly wheel circumference. Two teeth have been
eliminated for each half-revolution in order to
obtain a timing mark located at an absolute 90°
angle from top and bottom dead center positions.
(There are actually only 40 teeth on the flywheel.)
It must be mounted on the clutch bell-housing with
cap bolts.
The distributor cap sends this high tension current to
the four spark plugs, in the correct firing order.
VACUUM SENSOR (C)
Although this sensor appears to be identical to the
vacuum diaphragm found in a conventional ignition
system, its internal design is quite different.
According to the information received from both
sensors, the module sets the ignition advance ratio
and regulates primary voltage which is then.
transformed into high voltage current through the
coil.
MAGNETIC POSITION SENSOR (P)
The ignition module is fed by two sources of
information:
a. The magnetic position sensor (P).
D.
The vacuum sensor (C).
Do not remove this sensor. It is permanently
connected to the ignition module by a small gauge
wire which will break if any attempt is made to
remove the sensor unit.
Engine
RPM
Engine
vacuum
IGNITION MODULE (E)
The ignition module is an electronic device
(microprocessor) that calculates the ignition timing
advance ratio according to engine RPM and engine
vacuum.
B 1 0-1