62
Precautionary
measures
for
Electronic
Control
Units
installed on
vehicle
In
orderto
avoid
improper
operations which can result
in
permanent
damage
to
the
control
units installed on
the
vehicle,
it
is
advisable
to
observe
by
the
following instructions:
•
In
case
of
operations
on
the
chassis
requiring electric arc welding it
is
necessary to:
disconnect the connector from the control units;
for weldings
to
be carried
out
near the control units, remove the control unit
involved from the
chassis.
#
•
Never
disconnect and/or connect connectors from control units with engine running
or
with control units energized.
•
After
any
servicing operation requiring battery disconnection make sure that
on
reconnection terminals are well secured on terminals.
•
Do
not disconnect the battery with the engine running.
•
Do
not
use
a battery charger
to
start the engine.
• Disconnect the battery from on-board
mains
when charging it.
• Remove the Electronic Control Units if special operations require temperature
higher than
80°
C.
Precautions
to
be strictly observed
Before carrying
out
any servicing operation on
the
electrical system control unit and
in
par-
ticularbefore replacing
the
engine starting
relay,
it
is
absolutely necessary
to
take
the
following
precautions
to
avoid
the
risks
of
short
circuits:
• Before removing
the
relay from
the
control unit,
it
is
of
the
utmost importance
that
you
switch off
the
main switch
or
disconnect battery terminals.
• A
new
relay
is
to
be
installed
where
the
plastic casing has
come
offduring relay removal
or
if
the
relay has
been
opened
for any reason.
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