Jaguar XJ (X350). Manual — part 972

Diagnosis and testing

Electronic Engine Controls

Overview

2006MY sees the introduction of diesel to X350 and is accompanied by a diesel particulate filter

(DPF) system to comply with strict stage four emissions requirements. Active engine mounts are also

fitted and reduce transmitted vibration from the engine to the chassis when operating between 600

and 850rpm.

For more information on these systems,

Exhaust System and

Engine

The engine management system (EMS) on 2006MY diesel makes use of 7-digit diagnostic trouble

codes (DTCs) rather than the familiar 5-digit.

Refer to the DTC index in this section for guidance on how to use these codes with the Jaguar

approved diagnostic system or a scan tool.

Inspection and Verification

1 . Verify the customer concern.

2 . Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical

Electrical

Engine oil level

Cooling system coolant level

Fuel level

Fuel contamination/grade/quality

Fuel leaks

Accessory drive belt

Battery charge and condition

Fuses

Wiring harness

Electrical connector(s)

5 volt sensor supply

Sensor(s)

Engine control module (ECM)

Transmission control module (TCM)

3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

4 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to

retrieve the fault codes before proceeding to the DTC index, or the symptom chart if no DTCs are set.

Symptom Chart

Symptom

Possible source

Action

Engine cranks,

but does not start

Inertia fuel shutoff (IFS) switch

Low/contaminated fuel

Air leakage

Fuel system low pressure

circuit fault

Fuel pump module fault

Blocked fuel filter

Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

Fuel injection pump failure

Crankshaft position (CKP)

sensor

ECM fault

Check that the inertia switch has not tripped.

Check the fuel level/condition,

Fuel Charging and Controls For air intake

system,

Intake Air Distribution and Filtering Check

the fuel pump module operation, check the

fuel system low pressure circuit for

leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check

the fuel filter, check the FVCV and FPCV,

Fuel Charging and Controls Check the fuel

injection pump,

Fuel Injection Pump For CKP sensor cicuit

tests, GO to Pinpoint Test G549822p14.

Refer to the warranty policy and procedures

manual if an ECM is suspect.

Difficult to start

Glow plug system fault (very

cold conditions)

Low/contaminated fuel

Air leakage

Fuel pump module fault

Fuel system low pressure

circuit fault

Blocked fuel filter

Check the glow plug circuits,

Glow Plug System Check the fuel

level/condition,

Fuel Charging and Controls For air intake

system,

Intake Air Distribution and Filtering Check

the fuel pump module operation, check the

fuel system low pressure circuit for

leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check

the fuel filter, check the FVCV and FPCV,

Fuel Charging and Controls For EGR tests,

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Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

Exhaust gas recirculation (EGR)

valve(s) fault

Engine Emission Control

Rough idle

Air ingress

Low/contaminated fuel

Fuel system low pressure

circuit fault

Blocked fuel filter

Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

Exhaust gas recirculation (EGR)

valve(s) fault

Check the air intake system,

Intake Air Distribution and Filtering Check

the fuel level/condition,

Fuel Charging and Controls Check the fuel

system low pressure circuit for leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check

the fuel filter, check the FVCV and FPCV,

Fuel Charging and Controls For EGR tests,

Engine Emission Control

Lack of power

when

accelerating

Air intake system fault

Diesel particulate fliter (DPF)

blocked/restricted

Restricted exhaust system

Low fuel pressure

Exhaust gas recirculation (EGR)

valve(s) fault

Variable geometry

turbocharger (VGT)
actuator fault

Check the air intake system,

Intake Air Distribution and Filtering Check for

a blocked DPF or catalytic converter, install

new components as necessary.

Diesel Particulate Filter (DPF) or

Catalytic Converter - 2.7L V6 - TdV6

(17.50.05) Check the fuel pressure,

Fuel Charging and Controls For EGR tests,

Engine Emission Control For VGT actuator

tests,

Turbocharger

Engine

stops/stalls

Low/contaminated fuel

Air ingress

Fuel system low pressure

Check the fuel level/condition,

Fuel Charging and Controls Check the fuel

system low pressure circuit for leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check

for fuel system leaks, check the FVCV and

circuit fault

Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

High pressure fuel leak

Exhaust gas recirculation (EGR)

valve(s) fault

FPCV,

Fuel Charging and Controls For EGR tests,

Engine Emission Control

Engine judders

Low/contaminated fuel

Air ingress

Fuel system low pressure

circuit fault

Fuel metering valve

blocked/contaminated

Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

High pressure fuel leak

Fuel injection pump fault

Check the fuel level/condition,

Fuel Charging and Controls Check the fuel

system low pressure circuit for leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check for

fuel system leaks, check the FVCV and FPCV,

Fuel Charging and Controls Check the fuel

injection pump,

Fuel Injection Pump

Excessive fuel

consumption

Fuel system low pressure

circuit fault

Fuel volume control valve

(FVCV)
blocked/contaminated

Fuel pressure control valve

(FPCV)
blocked/contaminated

Fuel temperature sensor leak

High pressure fuel leak

Check the fuel system low pressure circuit for

leaks/damage,

Fuel Tank and Lines - 2.7L V6 - TdV6 Check

the FVCV and FPCV,

Fuel Charging and Controls Check the fuel

temperature sensor, fuel injection pump, etc

for leaks,

Fuel Charging and Controls Check for injector

DTCs. For EGR tests,

Engine Emission Control

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