Jaguar XJ (X350). Manual — part 678

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

Pin 01

Negative terminal

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Is the voltage between 9 and 15 volts?

-> Yes

GO to Pinpoint Test G552275t12.

-> No

REPAIR the power circuit. For additional information, refer to the wiring diagrams. Clear any DTCs,

test the system for normal operation.

G552275t7 : CHECK THE FVCV CONTROL CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Measure the resistance between:

C42, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t8.

-> No

GO to Pinpoint Test G552275t11.

G552275t8 : CHECK THE FVCV CONTROL CIRCUIT FOR SHORT CIRCUIT TO
POWER

1. Measure the resistance between:

C42, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t9.

-> No

GO to Pinpoint Test G552275t12.

G552275t9 : CHECK THE FVCV CONTROL CIRCUIT FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, C100. 3. Measure the resistance between:

C42, harness side C100, harness side

Pin 02

J4

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G552275t10.

-> No

REPAIR the high-resistance circuit. For additional information, refer to the wiring diagrams. Clear any

DTCs, test the system for normal operation.

G552275t10 : CHECK THE COMPONENT RESISTANCE

1. Measure the resistance between:

C42, component side C42, component side

Pin 02

Pin 01

Is the resistance between 1.5 and 15 ohms?

-> Yes

An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other

physical damage to the harness. If no fault is found in the circuit, suspect the following

component(s): - FVCV connector - FVCV - ECM connector - ECM

-> No

INSTALL a new fuel injection pump.

Fuel Injection Pump Clear any DTCs, test the system for normal operation.

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