Jaguar XJ (X350). Service manual — part 660
WARNING: This procedure involves fuel handling. Be prepared for fuel spillage at all times
and always observe fuel handling precautions. Failure to follow this instruction may result in
personal injury.
CAUTION: It is essential that absolute cleanliness is observed when working with these
components. Always install blanking plugs to any open orifices or lines. Failure to follow this
instruction may result in damage to the vehicle.
CAUTION: When probing connectors to take measurements in the course of the pinpoint
tests, use the adaptor kit, part number 3548-1358-00. Failure to follow this instruction may result
in damage to the vehicle.
NOTE:
When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to
3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always
take the resistance of the DMM leads into account.
NOTE:
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
NOTE:
If DTCs are recorded and a fault is not present when performing the pinpoint tests, an
intermittent concern may be the cause. Always check for loose connections and corroded
terminals.
PINPOINT TEST G552275p1 : CHECK
FOR FUEL SYSTEM LEAKS
G552275t1 : CHECK FOR FUEL SYSTEM LEAKS
1. Start and run the engine for five minutes. 2. Key off. 3. Inspect the fuel lines, pump, etc, in the
engine bay for cracks/damage. 4. Raise and support the vehicle.
Lifting 5. Inspect the fuel lines for cracks/damage. 6. Check the integrity of the joints in the supply
and return lines between the fuel tank and the fuel pump. 7. Carefully check around the fuel pipes,
injectors and pump for evidence of leakage. 8. If there is evidence of a significant leak, clean the
engine and repeat the test.
Is there any evidence of leakage?
-> Yes
RECTIFY the leak as necessary. Test the system for normal operation.
-> No
CHECK for other possible causes for the customer concern.
PINPOINT TEST G552275p2 : CHECK
THE FUEL PUMP MODULE FUNCTION
G552275t2 : CHECK THE FUEL PUMP MODULE FUNCTION
1. After thoroughly cleaning around the connections, disconnect the inlet pipe from the fuel filter. 2.
Position a suitable container beneath the fuel filter inlet pipe to collect fuel. 3. Key on, engine off (the
pump should run for a short period, depending on temperature, etc). 4. Check that fuel is pumped
from the fuel filter inlet pipe.
Is fuel pumped from the fuel filter inlet pipe?
-> Yes
CHECK the drive belt to the fuel injection pump.
Fuel Injection Pump Belt Check for DTCs. Test the system for normal operation.
-> No
CHECK the fuel pump module and circuit,
Fuel Tank and Lines - 2.7L Diesel
PINPOINT TEST G552275p3 : CHECK
FOR CONTAMINATED FUEL
G552275t3 : CHECK FOR UNUSUAL ODOURS FROM THE FUEL FILLER
1. Gather as much information as possible from the owner/driver regarding refuelling practices. 2.
Remove the fuel filler cap and check for unusual odours.
Are there any unusual odours from the fuel filler neck?
-> Yes
DRAIN the fuel tank and refill with fresh fuel. Install a new fuel filter.
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Fuel Filter - 2.7L Diesel (19.25.02) Test the vehicle for normal operation.
-> No
GO to Pinpoint Test G552275t4.
G552275t4 : CHECK FOR WATER IN THE FUEL
1. After thoroughly cleaning around the connections, disconnect the inlet pipe from the fuel filter. 2.
Position a suitable clear container beneath the fuel filter inlet pipe to collect fuel. 3. Key on, engine
off (the pump should run for a short period, depending on temperature, etc. It may be necessary to
turn the ignition on and off more than once to obtain the desired amount of fuel). 4. Collect
approximately one liter of fuel. 5. Allow the fuel to stand for at least one minute. 6. Without
disturbing the fuel, check for separation of the fuel into layers (a significant amount of water in the
fuel will result in a clear separation between the two fluids, with the water being at the bottom).
Does the fuel show clear separation?
-> Yes
DRAIN the fuel tank and refill with fresh fuel. Install a new fuel filter.
Fuel Filter - 2.7L Diesel (19.25.02) Test the vehicle for normal operation.
-> No
CHECK for other contaminants in the fuel.
PINPOINT TEST G552275p4 : CHECK
FOR BLOCKED FUEL FILTER
G552275t5 : CHECK THE FLOW OF FUEL THROUGH THE FILTER
1. After thoroughly cleaning around the connections, disconnect the fuel filter outlet pipe to the fuel
injection pump. 2.
WARNING: During this test, fuel will flow backwards through the fuel filter because of the
fuel cooler circuit.
Position a suitable container beneath the fuel filter outlet to collect fuel. 3. Key on, engine off (the
pump should run for a short period, depending on temperature, etc).
Is there an unrestricted flow of fuel through the filter?
-> Yes
CHECK for DTCs, check for another cause of customer complaint.
-> No
INSTALL a new fuel filter.
Fuel Filter - 2.7L Diesel (19.25.02) Test the vehicle for normal operation.
PINPOINT TEST G552275p5 : FUEL
VOLUME CONTROL VALVE AND
CIRCUIT
G552275t6 : CHECK FOR POWER TO THE FVCV
1.
Circuit
Pin
Power
01
Signal from ECM 02
2.
Circuit
Pin
Fuel volume control valve - signal J4
3. Key off. 4. Disconnect the FVCV connector, C42. 5. Key on, engine off. 6. Measure the voltage
between:
C42, harness side
Battery
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