Engine Rpm And Tdc Sensor - Fiat 1998 Marea Service Manual

Marea-Marea
99 range
1 Z
32B
22B
Copyright by Fiat Auto
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ENGINE RPM AND TDC SENSOR

The engine rpm and TDC sensor (1) is fixed
on the cylinder block/crankcase and is facing
the flywheel on the crankshaft pulley.
Operating principle
The sensor consists of a tubular casing (1)
which contains a permanent magnet (3) and
an electrical winding (2). The magnetic flow
produced by the magnet (3) undergoes fluc-
tuations as a result of the alteration in the gap
as the flywheel teeth pass.
These fluctuations produce an electro-motive
force in the winding (2) where an alternately
positive (tooth facing the sensor) and negative
(gap facing the sensor) voltage is produced.
The peak sensor output voltage depends, all
things being equal, on the distance between
the sensor and the tooth (gap).
Wiring connector
The sensor resistance can be measured by dis-
connecting the connector and connecting an
ohmmeter to the sensor
Resistance: 9600+10% ohm at 20°C
Engine
Fuel system
10.
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