2006 INFINITI QX56 Factory Service Manual

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Page 1641 of 3383

INFINITI QX56 2006 Factory Service Manual EC-430Revision: November 2009
DTC P0456 EVAP CONTROL SYSTEM
2006 QX56
Diagnostic ProcedureUBS00H5W
1. CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF.
2. Check for genuine NISSAN fuel filler

Page 1642 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0456 EVAP CONTROL SYSTEMEC-431
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Revision: November 2009 2006 QX56
5. INSTALL THE PRESSURE PUMP
To locate the EVAP leak, install EVAP service port adapter and pres-
sure p

Page 1643 of 3383

INFINITI QX56 2006 Factory Service Manual EC-432Revision: November 2009
DTC P0456 EVAP CONTROL SYSTEM
2006 QX56
7. CHECK FOR EVAP LEAK
Without CONSULT-II
1. Turn ignition switch OFF.
2. Apply 12 volts DC to EVAP canister vent control valve.

Page 1644 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0456 EVAP CONTROL SYSTEMEC-433
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Revision: November 2009 2006 QX56
9. CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control v

Page 1645 of 3383

INFINITI QX56 2006 Factory Service Manual EC-434Revision: November 2009
DTC P0456 EVAP CONTROL SYSTEM
2006 QX56
13. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
Without CONSULT-II
1. Start engine and warm it up to norma

Page 1646 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0456 EVAP CONTROL SYSTEMEC-435
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Revision: November 2009 2006 QX56
20. CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, lo

Page 1647 of 3383

INFINITI QX56 2006 Factory Service Manual EC-436Revision: November 2009
DTC P0460 FUEL LEVEL SENSOR
2006 QX56
DTC P0460 FUEL LEVEL SENSORPFP:25060
Component DescriptionUBS00H5X
The fuel level sensor is mounted in the fuel level sensor unit. T

EC-436Revision: November 2009
DTC P0460 FUEL LEVEL SENSOR
2006 QX56
DTC P0460 FUEL LEVEL SENSORPFP:25060
Component DescriptionUBS00H5X
The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the combination meter. The combination meter sends the fuel level
sensor signal to the ECM through CAN communication line.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.
On Board Diagnosis LogicUBS00H5Y
NOTE:
If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to EC-151, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
If DTC P0460 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to EC-154, "
DTC U1010 CAN COMMUNICATION" .
When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the
fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunc-
tion is detected.
DTC Confirmation ProcedureUBS00H5Z
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR ” mode with CONSULT-II.
3. Start engine and wait maximum of 2 consecutive minutes.
4. If 1st trip DTC is detected, go to EC-437, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
BBIA0402E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0460
0460 Fuel level sensor circuit
noise Even though the vehicle is parked, a signal
being varied is sent from the fuel level sensor
to ECM.
Harness or connectors
(The CAN communication line is open or
shorted)
Harness or connectors
(The sensor circuit is open or shorted)
Combination meter
Fuel level sensor
SEF195Y

Page 1648 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0460 FUEL LEVEL SENSOREC-437
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Revision: November 2009 2006 QX56
Diagnostic ProcedureUBS00H60
1. CHECK COMBINATION METER FUNCTION
Refer to DI-5, "
COMBINATION METERS" .
O

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