Jaguar XJ (X350). Manual — part 848

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

before proceeding to the next step.

3 . 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

(general)

Symptom (specific)

Possible source

Action

Non-Start

Engine does not crank

Security system

/Immobiliser engaged

Engine in shut-down mode

ECM relay

Battery

Park/Neutral switch

Starting system

Harness

Engine seized

Check that the security system

is disarmed. Check for DTCs.

For ECM relay tests, GO to

Pinpoint Test G531330p32.

For battery information,

Battery For Park/Neutral tests,

External Controls For starting

system,

For engine information,

Engine

Engine cranks, but does

not fire

Engine breather system

disconnected/restricte
d

Ignition system

Fuel system

Harness

Crankshaft position (CKP)

sensor

ECM fault

Check the engine breather

system,

Engine Emission Control - VIN

Range: G45704->G99999 For

ignition system tests,

Engine Ignition - VIN Range:

G45704->G99999 For fuel

system,

Fuel Charging and Controls -

VIN Range: G45704->G99999

For CKP tests, GO to Pinpoint

Test G531330p17.

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

For purge valve tests,

Evaporative Emissions - VIN

Range: G45704->G99999 For

fuel pump circuit tests,

Spark plugs

Check for water ingress

into spark plug wells

HT short to ground

(tracking) check rubber
boots for
cracks/damage

Ignition coil failure(s)

Harness

Fuel Charging and Controls -

VIN Range: G45704->G99999

For ignition system,

Engine Ignition - VIN Range:

G45704->G99999

Difficult to

start

Difficult to start cold

Coolant anti-freeze

content

Battery

CKP sensor

Exhaust gas recirculation

(EGR) valve stuck open

Fuel pump

Purge valve

Check the coolant anti-freeze

content. For battery

information,

Battery For CKP sensor tests,

GO to Pinpoint Test

G531330p17.

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) sensor

Mass air flow (MAF) sensor

Purge valve

Fuel pump

Ignition system

For injector information,

Fuel Charging and Controls -

VIN Range: G45704->G99999

For EFT sensor tests, GO to

Pinpoint Test G531330p34.

For IAT sensor tests, GO to

Pinpoint Test G531330p2.

For MAF sensor tests, GO to

Pinpoint Test G531330p1.

For purge valve tests,

Evaporative Emissions - VIN

Range: G45704->G99999

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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

Engine cranks too

fast/slow

Compressions high/low

Battery

Starting system

Check compressions,

Engine For battery

information,

Battery For starting system,

Engine

stalls

Engine stalls soon after

start

Breather system

disconnected/restricte
d

ECM relay

Harness

MAF sensor

Ignition system

Fuel lines

Fuel rail pressure (FRP)

sensor

Air filter restricted

Air leakage

Check the engine breather

system,

Engine Emission Control - VIN

Range: G45704->G99999 For

ECM relay tests, GO to Pinpoint

Test G531330p32.

For MAF sensor tests, GO to

Pinpoint Test G531330p1.

For ignition system tests,

Engine Ignition - 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:

G45704->G99999 For FRP

sensor tests, GO to Pinpoint

Test G531330p21.

For air filter and intake system

information,

Intake Air Distribution and

Filtering - VIN Range: G45704-

>G99999

Engine stalls on

ECM relay

For ECM relay tests, GO to

Pinpoint Test G531330p32.

overrun

Throttle position (TP)

sensors

For TP sensor tests, GO to

Pinpoint Test G531330p4.

and GO to Pinpoint Test

G531330p5.

Engine stalls at steady

speed

ECM relay

CKP sensor

TP sensors

Harness

For ECM relay tests, GO to

Pinpoint Test G531330p32.

For CKP sensor tests, GO to

Pinpoint Test G531330p17.

For TP sensor tests, GO to

Pinpoint Test G531330p4.

and GO to Pinpoint Test

G531330p5.

Engine stalls with

speed control enabled

ECM relay

Harness

For ECM relay tests, GO to

Pinpoint Test G531330p32.

Engine stalls when

maneuvering

ECM relay

TP sensors

Additional engine loads

(PAS, air conditioning,
etc)

Transmission malfunction

Controller area network

(CAN) network
malfunction

For ECM relay tests, GO to

Pinpoint Test G531330p32.

For TP sensor tests, GO to

Pinpoint Test G531330p4.

and GO to Pinpoint Test

G531330p5.

For accessory drive

information,

For transmission information,

For CAN network tests,

Poor

driveability

Engine hesitates/poor

acceleration

Fuel pump

Fuel pressure

Fuel lines

Injector leak

Air leakage

TP sensors

Throttle motor

Ignition system

EGR valve stuck open

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 injector

information,

Fuel Charging and Controls -

VIN Range: G45704->G99999

For intake system,

Intake Air Distribution and

Filtering - VIN Range: G45704-

>G99999 For TP sensor tests,

GO to Pinpoint Test

G531330p4.

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