Jaguar XJ (X350). Service manual — part 828
(leaking)
bulletin 05.1-29, or Vacutec
operating instructions)
P0444
Canister purge
valve circuit open
circuit
Canister purge valve
disconnected
Canister purge valve to
ECM drive circuit;
open circuit, high
resistance
Canister purge valve
failure
Check purge valve connections, GO
to Pinpoint Test G307413p2.
.
P0445
Canister purge
valve circuit short
circuit
Canister purge valve to
ECM drive circuit;
short circuit to
ground
Canister purge valve
failure
GO to Pinpoint Test G307413p2.
.
P0446
Canister close valve
malfunction (CCV
stuck closed)
Restricted flow through;
air vent, filter, CCV
or canister
Canister close valve
failure
Inspect the components listed, and
interconnecting pipework for
blockage, kinks or flattened areas
P0447
Canister close valve
circuit open circuit.
Canister close valve
power supply
circuit; open circuit,
short circuit
Canister close valve to
ECM drive circuit;
open circuit, high
resistance, short
circuit to B+ voltage
Canister close valve
failure
GO to Pinpoint Test G307413p3.
.
P0448
Canister close valve
circuit short circuit
Canister close valve to
ECM drive circuit;
short circuit to
ground
Canister close valve
failure
GO to Pinpoint Test G307413p3.
.
P0450
Fuel tank pressure
(FTP) sensor
FTP sensor
disconnected
Check FTP sensor connections. GO to
Pinpoint Test G307413p4.
malfunction (output
stuck/not changing)
FTP sensor failure
.
P0452
Fuel tank pressure
(FTP) sensor circuit;
low voltage (low
pressure)
FTP sensor
disconnected
FTP sensor to ECM
sense circuit; open
circuit, short circuit
to ground
FTP sensor to splice in
sensor supply
circuit; open circuit,
high resistance
FTP sensor failure
For FTP sensor supply tests, <<303-
14>> GO to Pinpoint Test
G307413p4.
.
P0453
Fuel tank pressure
(FTP) sensor circuit;
high voltage (high
pressure)
FTP sensor to splice in
sensor ground
circuit; open circuit,
high resistance
FTP sensor to ECM
sense circuit; open
circuit, short circuit
to high voltage
FTP sensor failure
Check fuel filler cap and seal,
pipework, etc. GO to Pinpoint Test
G307413p2.
. For fuel tank information, <<310-
01>>
P0455
Leak detected-large
Fuel filler cap missing
Fuel filler cap seal
defective
System leak (canister
damage, pipework
damage)
CCV stuck open
Canister purge valve to
engine purge pipe;
restricted, leaking,
disconnected
Canister purge valve
stuck closed
Fuel tank leak
Check fuel filler cap and seal,
pipework, etc. GO to Pinpoint Test
G307413p2.
. For fuel tank information, <<310-
01>>
www.
P0456
Leak detected - 20
thou
Fuel filler cap seal
defective
System leak (canister
damage, pipework
damage)
CCV leaking
Fuel tank leak
Check fuel filler cap and seal,
pipework, etc. GO to Pinpoint Test
G307413p2.
. For fuel tank information, <<310-
01>>
Pinpoint Tests
PINPOINT TEST G307413p1 : DTC
P0441; EVAPORATIVE SYSTEM
INCORRECT PURGE FLOW
G307413t1 : CHECK FUEL FILLER CAP FITMENT AND CONDITION OF
CANISTER, PIPES AND CONNECTORS
1. Make sure that the fuel filler cap is correctly installed and tightened. 2. Check the condition of the
carbon canister. 3. Check the condition of all accessible pipes and connectors in the vapor line.
Are the canister and all pipes and connectors in good condition?
-> Yes
GO to Pinpoint Test G307413t2.
-> No
REPAIR as necessary. CLEAR the DTC. Carry out a full evaporative system monitor drive cycle.
Recheck DTCs. For additional information, see "diagnostic drive cycles" above.
G307413t2 : CHECK EVAPORATIVE PURGE VALVE IS OPERATING
1. Disconnect the vapor pipe from the inlet port of the evaporative purge valve (ie, from fuel tank). 2.
RUN the engine for 2 minutes, making sure that the engine reaches normal operating temperature.
3. Check that the evaporative purge valve is operating, by touch or by sound (using a stethoscope, it
will be possible to hear the valve operating).
Is the valve operating?
-> Yes
Recheck DTCs. Carry out a flow check monitor drive cycle. For additional information, see "diagnostic
drive cycles" above.
-> No
CHECK for DTC P0444, P0445. Conduct "green" ECM drive cycle. For additional information, see
"diagnostic drive cycles" above.
PINPOINT TEST G307413p2 : DTC
P0442, P0444, P0445, P0455, P0456; LEAK
DETECTED: LARGE/20 THOU/40 THOU,
PURGE VALVE CIRCUIT
MALFUNCTION, OPEN/SHORT
CIRCUIT,
G307413t3 : CHECK FUEL FILLER CAP FITMENT AND CONDITION OF
CANISTER, PIPES AND CONNECTORS
1. Make sure that the fuel filler cap is correctly installed and tightened. 2. Check the condition of the
carbon canister. 3. Check the condition of all accessible pipes and connectors in the vapor line.
Are the canister and all pipes and connectors in good condition?
-> Yes
GO to Pinpoint Test G307413t4.
-> No
REPAIR as necessary. CLEAR the DTC. Carry out a full evaporative system monitor drive cycle.
Recheck DTCs. For additional information, see "diagnostic drive cycles" above.
G307413t4 : CHECK THE CANISTER PURGE VALVE DRIVE CIRCUIT FOR HIGH
RESISTANCE
1. Disconnect the battery negative terminal. 2. Disconnect the canister purge valve electrical
connector, EC63. 3. Disconnect the ECM electrical connector, PI01. 4. Measure the resistance
between EC63, pin 02 (UY) and PI01, pin 66 (UY).
Is the resistance greater than 5 ohms?
-> Yes
REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the
DTC. Carry out a full evaporative system monitor drive cycle.
-> No
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