Jaguar XJ (X350). Service manual — part 760

Engine Ignition - VIN Range: G45704-
>G99999

Overview

There are changes to the engine management system (EMS) for 2006 my, the most obvious of which

will be the change to 7-digit diagnostic trouble codes (DTCs) from 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

Fuses

Wiring harness

Loose or corroded electrical connectors

Ignition coils

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.

Symptom Chart

Symptom

Possible source

Action

Engine cranks, but does

not fire

Engine breather system

disconnected/restricted

Ignition system

Check the engine breather system,

Engine Emission Control - VIN Range:

G45704->G99999 For ignition system

tests, refer to pinpoint tests in this

Fuel system

Harness

Crankshaft position (CKP)

sensor

ECM fault

section. Check the fuel pressure,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For CKP tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 Refer to the warranty

policy and procedures manual if an ECM

is suspect.

Engine cranks and fires,

but will not start

Evaporative emissions purge

valve

Fuel pump

Spark plugs

HT short to ground

(tracking) check rubber
boots for
cracks/damage

Ignition coil failure(s)

Harness

For purge valve tests,

Evaporative Emissions - VIN Range:

G45704->G99999 Check the fuel

pressure,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For spark plug tests,

GO to Pinpoint Test G531328p2.

For ignition coil circuit tests, GO to

Pinpoint Test G531328p1.

Difficult to start cold

Coolant anti-freeze content

Battery

CKP sensor

Exhaust gas recirculation

(EGR) valve stuck open

Fuel pump

Purge valve

Check the anti-freeze content. For

battery information,

Battery For CKP sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For EGR valve tests,

Engine Emission Control - VIN Range:

G45704->G99999 Check the fuel

pressure,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For purge valve tests,

Evaporative Emissions - VIN Range:

G45704->G99999

Difficult to start hot

Injector leak

Engine fuel temperature

(EFT) sensor

Intake air temperature (IAT)

For fuel injectors,

Fuel Injectors (18.10.02) For EFT, IAT

and MAF sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For purge valve tests,

Evaporative Emissions - VIN Range:

www.

sensor

Mass air flow (MAF) sensor

Purge valve

Fuel pump

Ignition system

EGR valve stuck open

G45704->G99999 Check the fuel

pressure,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531328p1.

For EGR valve tests,

Engine Emission Control - VIN Range:

G45704->G99999

Difficult to start after hot

soak (vehicle standing

after engine has reached

operating temperature)

Injector leak

EFT sensor

IAT sensor

MAF sensor

Purge valve

Fuel pump

Ignition system

EGR valve stuck open

For fuel injectors,

Fuel Injectors (18.10.02) For EFT, IAT

and MAF sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For purge valve tests,

Evaporative Emissions - VIN Range:

G45704->G99999 Check the fuel

pressure,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531328p1.

For EGR valve tests,

Engine Emission Control - VIN Range:

G45704->G99999

Engine stalls soon after

start

Breather system

disconnected/restricted

ECM relay

Harness

MAF sensor

Ignition system

Air filter restricted

Fuel lines

For breather system,

Engine Emission Control - VIN Range:

G45704->G99999 For ECM relay and

MAF sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531328p1.

For air filter information,

Intake Air Distribution and Filtering -

VIN Range: G00442->G45703 Check the

fuel lines,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

FRP sensor

Air leakage

G45704->G99999 For FRP sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For intake system

information,

Intake Air Distribution and Filtering -

VIN Range: G00442->G45703

Engine hesitates/poor

acceleration

Fuel pump

Injector leak

Fuel pressure

Fuel lines

Air leakage

Throttle position (TP)

sensors

Throttle motor

Ignition system

EGR valve stuck open

HO2 sensors

Transmission malfunction

Restricted pedal travel

(carpet, etc)

Accelerator pedal position

(APP) sensor

Check the fuel pressure, check the fuel

lines,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For intake system,

Intake Air Distribution and Filtering -

VIN Range: G00442->G45703 For TP

sensor and throttle motor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531328p1.

For EGR valve tests,

Engine Emission Control - VIN Range:

G45704->G99999 Check for DTCs

relating to HO2 sensors. Refer to the

DTC index for pinpoint tests for DTC set.

For transmission information,

Check the accelerator pedal travel. For

APP sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999

Engine backfires

Fuel pump

Fuel lines

Air leakage

MAF sensor

HO2 sensors

Ignition system

Sticking variable camshaft

Check the fuel pressure, check the fuel

lines,

Fuel Tank and Lines - 4.2L NA V8 -

AJV8/4.2L SC V8 - AJV8/3.0L NA V6 -

AJ27/3.5L NA V8 - AJV8, VIN Range:

G45704->G99999 For intake system,

Intake Air Distribution and Filtering -

VIN Range: G00442->G45703 For MAF

sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 Check for DTCs

relating to HO2 sensors. Refer to the

www.