Jaguar XJ (X350). Manual — part 830

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC.

Carry out a full evaporative system monitor drive cycle.

-> No

INSTALL a new FTP sensor.

Fuel Tank Pressure Sensor (19.55.31) CLEAR the DTC. Carry out a full evaporative system monitor

drive cycle.

Evaporative Emissions - VIN Range:
G45704->G99999

Overview

2006my changes

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 Federal evaporative emissions (Europe is

unchanged) and all market exhaust gas recirculation to comply with stage four emissions

requirements.

The hardware changes to the Federal evaporative emissions system are the deletion of the canister

close valve and the fuel tank pressure sensor, which have been replaced with a combined unit

incorporating a DMTL (diagnostic monitoring of tank leakage) pump and a COV (change-over valve)

into one module.

The software changes will have more effect on the technician, as there is no longer the need to carry

out extensive drive cycles to confirm the success of a repair.

DMTL conditions

The DMTL test is performed after the engine has stopped following a 10 minute run, providing that

the vehicle fuel tank is between 15 and 85 percent full and that the ambient temperature is above

0°C (32°F) and less than 40°C (104°F).

The DMTL pump is driven to pressurize the fuel tank and the current is measured with the change-

over valve in different states.

A comparison of the current draw in each state indicates the degree of any leak, and the ECM then

sets the appropriate DTC.

Inspection and verification

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

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

before proceeding to the next step.

Mechanical

Electrical

Fuel filler cap and seal

Fuel filler neck

Fuses

Connectors

www.

DMTL fresh air filter (restriction, etc)

Fuel tank (leaks, damage, etc)

Fuel lines and joints, etc

Carbon canister

Purge valve

DMTL pump module

Harness(es)

Purge valve

DMTL pump

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.

4 . NOTE:

On all vehicles equipped with Diagnostic Monitor Tank Leakage (DMTL), there is a requirement

to blank off the ventilation port (large diameter stub pipe) of the DMTL module, to prevent mis-

diagnosis when carrying out a smoke test.

Where K-Line, Vacutec or other proprietary smoke test equipment is available, it should be utilised to

assist with Evaporative Emissions System leak diagnosis.

Symptom Chart

Symptom

Possible Source

Action

Difficulty in filling

Restriction in the vapor line between

the fuel tank and the carbon
canister outlet/atmospheric port

Check for restrictions/damage, etc

(see visual inspection).

Fuel smell

System leak

Purge valve inoperative

Check for leaks, check the purge

valve operation. GO to Pinpoint

Test G532445p1.

Message center

display (refer to the

owners handbook)

Fuel filler cap missing/not tightened

after refuelling

Check the fuel filler cap and seal

(see visual inspection).

Diagnostic

Trouble

Code

Description

Possible Source

Action

P044100

Incorrect purge flow

Evaporative canister purge

pipe restricted,

For basic checks. GO to

Pinpoint Test G532445p1.

leaking, disconnected

Evaporative canister vent

restricted

Evaporative canister purge

valve to engine pipe(s)
restricted, leaking,
disconnected

Evaporative canister purge

valve failure

Check for DTCs indicating a

purge valve fault.

P044700

Change-over valve (COV)

control circuit

DMTL COV circuit short

circuit to ground

For COV circuit tests, GO to

Pinpoint Test G532445p3.

P044800

COV control circuit

DMTL COV circuit short

circuit to power

For COV circuit tests, GO to

Pinpoint Test G532445p3.

P045600

Leak detected (very small

leak)

DMTL has detected a leak

in the fuel system

Check the fuel system

integrity (see visual

inspection). Carry out K line

or Vacutec tests to identify

the leak.

P045800

Purge valve control circuit

Purge valve control circuit:

short circuit to ground

Purge valve control circuit:

high resistance

For purge valve circuit

tests. GO to Pinpoint Test

G532445p2.

P045900

Purge valve control circuit

Purge valve control circuit:

short circuit to power

For purge valve circuit

tests. GO to Pinpoint Test

G532445p2.

P240100

DMTL pump control

circuit

DMTL pump control

circuit: short circuit to
ground

For DMTL pump circuit

tests. GO to Pinpoint Test

G532445p4.

P240200

DMTL pump control

circuit

DMTL pump control

circuit: short circuit to
power

For DMTL pump circuit

tests. GO to Pinpoint Test

G532445p4.

P240429

DMTL pump sense circuit

range/performance -

signal invalid

DMTL reference leak

DMTL pump circuit: short

circuit, high resistance

DMTL pipework

Check the DMTL pipework.

For DMTL pump tests, GO

to Pinpoint Test

G532445p4.

www.