IMPORTANT If the sound system
or car alarm systems are not installed
correctly, they can interfere with the
working of the electronic control
units.
Modifications or repairs
to the electrical system
carried out incorrectly
and without bearing the features
of the system in mind can cause
malfunctions with the risk of fire.
120
ELECTRONIC
CONTROL UNITS
When the car is being used normal-
ly, special measures are not necessary.
The following instructions must be
followed very carefully however, if you
work on the electrical system or
where emergency starting is neces-
sary:
– Never disconnect the battery from
the electrical system while the engine
is running.
– Disconnect the battery from the
electrical system if you are recharg-
ing it. Modern battery chargers can
discharge voltage up to 20 V.
– Never perform emergency star-
tups with a battery charger. Always
use an auxiliary battery (see “Startup
with auxiliary battery” in “In an emer-
gency” chapter).
– Be particularly careful when con-
necting the battery to the electrical
system. Make sure that the polarity is
correct and the connection is efficient.
After reconnecting the battery, the in-
jection/ignition control unit will need
to readapt its internal parameters.
Therefore, the car’s performance may
change slightly during the first few kilo-
meters.
– Do not connect or disconnect the
terminals of the electronic units while
the ignition key is at
MAR.
– Do not check polarity through
sparking.
– Disconnect the electronic units if
you are electrically welding the car
body. Remove the units if tempera-
tures exceed 80°C (special operations
on the bodywork etc.).
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