Jaguar XJ (X350). Service manual — part 750

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 G531326p2.

For ignition coil circuit tests, GO to

Pinpoint Test G531326p1.

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:

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

G531326p1.

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

G531326p1.

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

G531326p1.

For air filter information,

Intake Air Distribution and Filtering -

VIN Range: G45704->G99999 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:

www.

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: G45704->G99999

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: G45704->G99999 For TP

sensor and throttle motor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531326p1.

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: G45704->G99999 For MAF

sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 Check for DTCs

relating to HO2 sensors. Refer to the

timing (VCT) hub

APP sensor

DTC index for pinpoint tests for DTC set.

For ignition coil circuit tests, GO to

Pinpoint Test G531326p1.

For VCT information,

Engine For APP sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999

Engine surges

Fuel pump

Fuel lines

MAF sensor

Harness

TP sensors

Throttle motor

Ignition system

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 MAF, TP sensor

and throttle motor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For ignition coil

circuit tests, GO to Pinpoint Test

G531326p1.

Engine detonates/knocks

Knock sensor (KS) circuit

malfunction

Fuel pump

Fuel lines

FRP sensor

MAF sensor

HO2 sensors

Air leakage

Sticking VCT hub

BARO sensor malfunction

(internal ECM fault)

For KS circuit tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 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 FRP, MAF and

HO2 sensor tests,

Electronic Engine Controls - VIN Range:

G45704->G99999 For intake system,

Intake Air Distribution and Filtering -

VIN Range: G45704->G99999 Check

DTCs for VCT range/performance fault.

For VCT information,

Engine Refer to the warranty policy and

procedures manual if an ECM is suspect.

No throttle response

APP sensor malfunction

TP sensors

Throttle motor

For APP, TP sensor and throttle motor

tests,

Electronic Engine Controls - VIN Range:

G45704->G99999

Poor throttle response

APP sensor malfunction

For APP, TP, ECT, and MAF sensor tests,

Electronic Engine Controls - VIN Range:

www.