Jaguar XJ (X350). Manual — part 16
Each maintenance procedure in this manual is described in the sequence necessary to complete the
operation in the minimum time, as specified in the Repair Operation Times schedule.
References to Bank-1 and Bank-2
References to Bank-1 and Bank-2 are made with regard to the engine. When viewed from the
flywheel the right-hand bank will be Bank-1 and the left-hand bank will be Bank-2.
Special Tools
Any special tools and equipment required to perform a maintenance procedure, are shown at the
beginning of each procedure. When possible, illustrations are given to assist in identifying the tool
needed.
Disconnecting/Connecting the Battery
Always stop the engine before disconnecting the battery negative lead and make sure the battery
positive lead is isolated i.e. wrapped in a suitable cloth.
WARNING: Radio code saving devices must not be used when
conducting work on Air Bag or Fuel systems. It must be noted that, when
using these devices, the vehicle electrical system is still live albeit with a
reduced current flow.
NOTE:
Before disconnecting the battery make sure that the radio receiver/cassette
player/mini disc player and compact disc player keycodes are known and,
that no data is required from the engine control module (ECM) as battery
disconnection will erase any fault codes and idle/drive values held in the
Keep Alive Memory (KAM). It is not necessary to disconnect or remove
electronic control modules.
Always disconnect the battery before commencing repair operations which require:
•
The vehicle to be jacked up
•
Work on the engine
•
Work underneath the vehicle
•
Arc welding
Alternatively a Radio Code Saver may be used. With the battery disconnected, a Radio Code Saver
will allow sufficient current to pass to maintain the radio receiver/cassette player/mini disc player
and compact disc player memory, operate the clock and supply the door operated interior lights
while isolating the battery in the event of a short circuit.
Reconnecting the Battery
WARNING: If the battery has been on bench charge the cells may
be giving off explosive hydrogen gas. Avoid creating sparks, and if in
doubt cover the vent plugs or covers with a damp cloth.
Always make sure that all electrical systems are switched OFF before reconnecting the battery to
avoid causing sparks or damage to sensitive electrical equipment.
Always reconnect the battery positive lead first and the negative last, ensuring that there is a good
electrical contact and the battery terminals are secure.
Restart the clock (where fitted) and set it to the correct time.
Re - enter the radio receiver/cassette player/mini disc player and compact disc player keycodes and
preset' frequencies, if known.
Following reconnection of the battery, the engine should be allowed to idle until it has reached
normal operating temperature as the stored idle and drive values contained within the ECM have
been lost. Allow the vehicle to idle for a further three minutes. Drive the vehicle at constant speeds
of approximately 48 km/h (30 mph), 64 km/h (40 mph), 80 km/h (50 mph), 96 km/h (60 mph) and
112 km/h (70 mph) for three minutes each. This may cause a driveability concern if the procedure is
not carried out. This will allow the ECM to relearn idle values.
Connecting a Slave Battery Using Jump Leads
WARNING: If the slave battery has recently been charged and is
gassing, cover the vent plugs or covers with a damp cloth to reduce the
risk of explosion should arcing occur when connecting the jump leads.
CAUTION: A flat battery condition may have been caused by an
electrical short circuit. If this condition exists there will be an apparently
live circuit on the vehicle even when all normal circuits are switched off.
This can cause arcing when the jump leads are connected.
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CAUTION: Whilst it is not recommended that the vehicle is jump
started, it is recognized that this may occasionally be the only practical
way to mobilize a vehicle. In such an instance the discharged battery
must be recharged immediately after jump starting to avoid permanent
damage.
•
Always make sure that the jump leads are adequate for the task. Heavy duty cables must be
used.
•
Always make sure that the slave battery is of the same voltage as the vehicle battery. The
batteries must be connected in parallel.
•
Always make sure that switchable electric circuits are switched off before connecting jump
leads. This reduces the risk of sparks occurring when the final connection is made.
WARNING: Make sure that the ends of the jump leads do not touch
each other or ground against the vehicle body at any time while the leads
are attached to the battery. A fully charged battery, if shorted through
jump leads, can discharge at a rate well above 1000 amps causing
violent arcing and very rapid heating of the jump leads and terminals,
and can even cause the battery to explode.
Always connect the jump leads in the following sequence.
•
Slave battery positive first then vehicle battery positive.
•
Slave battery negative next and then vehicle ground at least, 300 mm (12 in) from the
battery terminal e.g. engine lifting bracket.
Always reduce the engine speed to idle before disconnecting the jump leads.
Before removing the jump leads from the vehicle that had the discharged battery, switch on the
heater blower (high) or the heated rear screen, to reduce the voltage peak when the leads are
removed.
Always disconnect the jump leads in the reverse order to the connecting sequence and take great
care not to short the ends of the leads.
Do not rely on the alternator to restore a discharged battery. For an alternator to recharge a battery,
it would take in excess of 8 hours continuous driving with no additional loads placed on the battery.
Component Cleaning
To prevent ingress of dirt, accumulations of loose dirt and greasy deposits should be removed before
disconnecting or dismantling components or assemblies.
Components should be thoroughly cleaned before inspection prior to reassembly.
Cleaning Methods:
•
Dry Cleaning
•
Removal of loose dirt with soft or wire brushes.
•
Scraping dirt off with a piece of metal or wood.
•
Wiping off with a rag.
CAUTION: Compressed air is sometimes wet so use with caution,
especially on hydraulic systems.
•
Blowing dirt off with compressed air. (Eye protection should be worn when using this
method).
•
Removal of dry dust using vacuum equipment. This method should always be used to remove
friction lining material dust (asbestos particles).
•
Steam Cleaning
Calibration of Essential Measuring Equipment
WARNING: Failure to comply may result in personal injury or
damage to components.
It is of fundamental importance that certain essential equipment e.g. torque wrenches, multimeters,
exhaust gas analysers, rolling roads etc., are regularly calibrated in accordance with the
manufacturers instructions.
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