Inertia Safety Switch; Components Of Inertia Switch - Fiat 1998 Marea Service Manual

Marea-Marea
1998 range
Copyright Fiat Auto
Weekend^
16v
I N E R T I A S A F E T Y S W I T C H
The vehicle is equipped with an inertia
switch located inside the passenger compart-
ment beneath the driver's seat to increase
passenger safety in the case of impact.
This sensor reduces the possibility of fire
(caused by fuel emerging from the injection
system) by de-activating the fuel feed pump.
The switch consists of a steel ball fitted inside
a tapered housing. It is held in position
through the attractive force of an permanent
magnet.
The ball is released from the magnetic force
in the case of violent impact, when it opens
the normally closed (NC) electrical circuit to
cut off the fuel pump earth connection and
thus the fuel supply to the injection system.
To restore the pump earth connection, push
the seat back and press the switch until it
clicks on.
Removing-refitting
1. Move driver's seat back fully, unscrew the
bolts indicated and remove the plastic
protection.
2. Unscrew the bolts, disconnect electrical
connection and remove the switch.
After even an apparently slight colli-
A
sion, if a smell of petrol is noted or fu-
el leaks are seen, do not activate the
switch again until the fault has been
found and corrected in order to avoid
the risk of fire.
Components of inertia s w i t c h
1. Inertia switch assembly
2. Sheath
3. Button
4. Upper end
5. Fitting end
6. Permanent magnet
7. Permanent magnet seat
8. Steel ball
C= Common terminal
N.C. Normally closed
N.A. Normally open
Engine
Fuel system
10.
4 5