Fiat 1996 Brava Service Manual page 360

Bravo-Brava f ^
98 range
JTD
Engine
Fuel system
10.
RPM SENSOR
The rpm sensor is fitted on the cylinder block-
/crankcase facing the flywheel on the
crankshaft.
The sensor is the inductive type, in other words
it operates through the variation in the magnetic
field produced by the teeth on the flywheel
(60-2 teeth) passing in front of the sensor ele­
ment.
The injection control unit uses the rpm sensor
signal to determine the crankshaft angular po­
sition and speed.
Operation
The passage from full to empty due to whether
or not there is a tooth, determines a variation in
the magnetic flow sufficient to produce an al­
ternating voltage from the counting of the teeth
on the flywheel.
The peak rpm sensor output voltage depends,
all things being equal, on the distance between
the sensor and the flywheel teeth.
1. Metal bush
2. Permanent magnet
3. Sensor body
4. Winding
5. Core
6. Flywheel
7. Electrical connection
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To obtain the correct signals, the recom­
mended distance between the flywheel and
the sensor (gap) should be between 0.8 and
1.5 mm.
This distance cannot be adjusted therefore if
the gap is outside of the tolerance, check the
condition of the sensor and the flywheel.
Winding resistance: 860 Ohm ±10% at 20 C
1. Maximum mangetic flow
2. Minimum magnetic flow
3. Alternating voltage
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