Electronic Control Units; Spark Plugs - Maserati Quattroporte Automatic 2009 Owner's Manual

M139_UM_usa1.book Page 251 Monday, September 1, 2008 2:39 PM

Electronic control units

No special precautions are required for
the normal use of the vehicle.
In case of repairs to the electrical
system or in an emergency starting, the
following instructions must be strictly
followed:
– Never disconnect the battery from
the electrical system when the
engine is running.
– Disconnect the battery from the
electrical system when recharging it.
WARNING: When the battery is
disconnected, you must first detach
the negative terminal (–) and then the
positive one (+).
When the battery is reconnected, you
must first attach the positive (+) and
then the negative one (–).
– Never carry out an emergency start
with a battery charger: always use an
auxiliary battery.
– Take special care when connecting
the battery to the electrical system,
checking both for correct polarity
and for proper connection.
– Do not connect or disconnect the
terminals of the electronic control
units when the ignition key is in the
MAR (ON) position.
– Do not check the electric polarities
through sparking.
– Disconnect the electronic control
units when carrying out electric
weldings on the body. Remove them
if the temperature is over 176 °F
(80°C) (special interventions on the
bodywork, etc.).
WARNING: Incorrect installation or
modifications to the radio and alarm
systems may interfere with the proper
operation of the electronic control
units.
WARNING: Changes or repairs to the
electrical system carried out in an
incorrect manner or without taking
into account the technical
specifications of the system may cause
operating anomalies with the risk of
fire.
WARNING: If you need to wash the
engine compartment, do not direct the
jet of water for too long directly on the
engine compartment ECU.

Spark plugs

It is essential that the spark plugs are
sound and clean for the engine to
work efficiently and to ensure that
polluting emissions are kept to a
minimum level.
WARNING: The spark plugs must be
changed at the intervals specified in
the Maintenance Schedule. Only use
the prescribed spark plugs: faults may
arise if the heat rating is unsuitable, or
if the specified working life is not
ensured.
Electronic control units / Spark plugs
Electronic control units
8
251