2009 INFINITI QX56 Factory Service Manual

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Page 1809 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-482
< PRECAUTION >[VK56DE]
PRECAUTIONS

Before replacing ECM, perform ECM Terminals and Reference
Value inspection and make sure ECM functions properly.
Refer to EC-422, "ECM Terminal and Refere

Page 1810 of 4171

INFINITI QX56 2009 Factory Service Manual
PRECAUTIONSEC-483
< PRECAUTION > [VK56DE]
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Do not operate fuel pump when there is no fuel in lines.
Tighten fuel hose clamps to the specified torque.
Do not dep

Page 1811 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-484
< PREPARATION >[VK56DE]
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000003771744
The actual shapes of Kent-Moore tool
s may differ from those of special service tools il

Page 1812 of 4171

INFINITI QX56 2009 Factory Service Manual
PREPARATIONEC-485
< PREPARATION > [VK56DE]
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Commercial Service ToolINFOID:0000000003771745
(J-45488)
Quick connector re-
lease
Remove fuel tube quick connectors in engi

Page 1813 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-486
< PREPARATION >[VK56DE]
PREPARATION
Oxygen sensor thread
cleaner
i.e.: (J-43897-18)
(J-43897-12)Reconditioning the exhaust system threads before
installing a new oxygen sensor. Use with anti

Page 1814 of 4171

INFINITI QX56 2009 Factory Service Manual
FUEL PRESSUREEC-487
< ON-VEHICLE MAINTENANCE > [VK56DE]
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ON-VEHICLE MAINTENANCE
FUEL PRESSURE
Fuel Pressure CheckINFOID:0000000003771746
FUEL PRESSURE RELEASE
With CON

FUEL PRESSUREEC-487
< ON-VEHICLE MAINTENANCE > [VK56DE]
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ON-VEHICLE MAINTENANCE
FUEL PRESSURE
Fuel Pressure CheckINFOID:0000000003771746
FUEL PRESSURE RELEASE
With CONSULT-IIl
1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in
“WORK SUPPORT” mode with CONSULT-IIl.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
Without CONSULT-IIl
1. Remove fuel pump fuse located in IPDM E/R.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel pressure.
4. Turn ignition switch OFF.
5. Reinstall fuel pump fuse after servicing fuel system.
FUEL PRESSURE CHECK
CAUTION:
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
Be careful not to scratch or get the fuel hose conn ection area dirty when servicing, so that the quick
connector o-ring maintains sealability.
Use Fuel Pressure Gauge Kit J-44321 and Fuel Pr essure Adapter J-44321-6 to check fuel pressure.
Do not perform fuel pressure check with electrical system operating (i.e. lights, rear defog, A/C, etc.).
Fuel pressure gauge may indicate false readings du e to varying engine loads and changes in mani-
fold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because JA 60 models do not have fuel return system.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release J-45488. Refer to EM-40
.
Do not twist or kink fuel hose because it is plastic hose.
Do not remove fuel hose from quick connector.
Keep fuel hose connections clean.
4. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure Gauge (from kit J-44321) as shown in figure.
Do not distort or bend fuel rail tube when installing fuel pres-sure gauge adapter.
When reconnecting fuel hose, check the original fuel hose for damage and abnormality.
5. Turn ignition switch ON (reactivate fuel pump), and check for fuel leakage.
6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge. During fuel pressure check, check for fuel leakage from fuel
connection every 3 minutes.
BBIA0380E
BBIA0390E
Revision: December 20092009 QX56

Page 1815 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-488
< ON-VEHICLE MAINTENANCE >[VK56DE]
FUEL PRESSURE
8. If result is unsatisfactory, go to next step.
9. Check the following.
Fuel hoses and fuel tubes for clogging
Fuel filter for clogging

Page 1816 of 4171

INFINITI QX56 2009 Factory Service Manual
EVAP LEAK CHECKEC-489
< ON-VEHICLE MAINTENANCE > [VK56DE]
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EVAP LEAK CHECK
How to Detect Fuel Vapor LeakageINFOID:0000000003771747
CAUTION:
Never use compressed air

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