Jaguar XJ (X350). Manual — part 923

Electronic Engine Controls - 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, plus the

addition of secondary air injection and changes to evaporative emissions and exhaust gas

recirculation to comply with stage four emissions requirements.

For more information on these systems,

Electronic Engine Controls

Engine Emission Control - VIN Range: G45704->G99999

Evaporative Emissions - VIN Range: G45704->G99999

Inspection and Verification

1 . Verify the customer concern.

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

Visual Inspection Chart

Mechanical

Electrical

Engine oil level

Cooling system coolant level

Fuel level

Fuel contamination/grade/quality

Throttle body

Poly-vee belt

Fuses

Wiring harness

Electrical connector(s)

Sensor(s)

Engine control module (ECM)

Transmission control module

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

before proceeding to the next step

2 . 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

/Immobilizer 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

starting system,

For ECM relay tests, GO to

Pinpoint Test G531332p32.

For battery information,

Battery For Park/Neutral tests,

External Controls For engine

information,

Engine

Engine cranks, but does

not fire

Engine breather system

disconnected/restrict
ed

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 tests,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

CKP tests, GO to Pinpoint Test

G531332p17.

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

Ignition coil failure(s)

Harness

For purge valve tests,

Evaporative Emissions - VIN

Range: G45704->G99999 For

fuel system tests,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

ignition system tests,

Engine Ignition - VIN Range:

G45704->G99999

Difficult to

start

Difficult to start cold

Check coolant anti-freeze

content

For battery information,

Battery For CKP sensor tests,

GO to Pinpoint Test

www.

Battery

CKP sensor

Exhaust gas recirculation

(EGR) valve stuck
open

Fuel pump

Evaporative emissions

purge valve

G531332p17.

For EGR system tests,

Engine Emission Control - VIN

Range: G45704->G99999 For

fuel system tests,

Fuel Charging and Controls - 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

Evaporative emissions

purge valve

Fuel pump

Ignition system

For fuel system tests,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

EFT sensor tests, GO to Pinpoint

Test G531332p34.

For IAT sensor tests, GO to

Pinpoint Test G531332p2.

For MAF sensor tests, GO to

Pinpoint Test G531332p1.

For purge valve tests,

Evaporative Emissions - 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

Evaporative emissions

purge valve

Fuel pump

Ignition system

For fuel system tests,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

EFT sensor tests, GO to Pinpoint

Test G531332p34.

For IAT sensor tests, GO to

Pinpoint Test G531332p2.

For MAF sensor tests, GO to

Pinpoint Test G531332p1.

For purge valve tests,

Evaporative Emissions - VIN

Range: G45704->G99999

Engine cranks too

fast/slow

Compressions high/low

Battery

Starting system

Check compressions,

Engine For battery information,

Battery For starting system

tests,

Engine

stalls

Engine stalls soon after

start

Breather system

disconnected/restrict
ed

ECM relay

MAF sensor

Ignition system

Air filter restricted

Fuel lines

Fuel rail pressure (FRP)

sensor

Air leakage

Check the engine breather

system,

Engine Emission Control - VIN

Range: G45704->G99999 For

ECM relay tests, GO to Pinpoint

Test G531332p32.

For MAF sensor tests, GO to

Pinpoint Test G531332p1.

For ignition system tests,

Engine Ignition - VIN Range:

G45704->G99999 For air filter

information,

Intake Air Distribution and

Filtering - VIN Range: G45704-

>G99999 For fuel system,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

FRP sensor tests, GO to Pinpoint

Test G531332p40.

For intake system information,

Intake Air Distribution and

Filtering - VIN Range: G45704-

>G99999

Engine stalls on overrun

ECM relay

Throttle position (TP)

sensors

For ECM relay tests, GO to

Pinpoint Test G531332p32.

For TP sensor tests, GO to

Pinpoint Test G531332p4.

and GO to Pinpoint Test

G531332p5.

For fuel system tests,

Fuel Charging and Controls - VIN

Range: G45704->G99999

Engine stalls at steady

speed

ECM relay

CKP sensor

TP sensors

For ECM relay tests, GO to

Pinpoint Test G531332p32.

For fuel system,

Fuel Charging and Controls - VIN

Range: G45704->G99999 For

CKP sensor tests, GO to Pinpoint

Test G531332p17.

For TP sensor tests, GO to

Pinpoint Test G531332p4.

and GO to Pinpoint Test

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