Jaguar XJ (X350). Service 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.
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