Infiniti QX56 (JA60). Manual - part 459

EC-488

< PREPARATION >

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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-
seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for Zirco-
nia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for Tita-
nia Oxygen Sensor

Anti-seize lubricant 
i.e.: (Permatex

TM 

133AR or equivalent 
meeting MIL specifica-
tion MIL-A-907)

Lubricating oxygen sensor thread cleaning tool 
when reconditioning exhaust system threads.

Tool name
(Kent-Moore No.)

Description

AEM488

S-NT779

FUEL PRESSURE

EC-489

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ON-VEHICLE MAINTENANCE

FUEL PRESSURE

Fuel Pressure Check

INFOID:0000000005149507

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 connection area dirty when servicing, so that the quick

connector o-ring maintains sealability.

• Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure 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 due 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 JA60 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-26

.

• 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

EC-490

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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

• Fuel pump

• Fuel pressure regulator for clogging

If OK, replace fuel pressure regulator.

If NG, repair or replace.

10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure

to zero. Refer to "FUEL PRESSURE RELEASE".

At idling: Approximately 350 kPa (3.57 kg/cm

2

, 51 psi)

EVAP LEAK CHECK

EC-491

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EVAP LEAK CHECK

How to Detect Fuel Vapor Leakage

INFOID:0000000005149508

CAUTION:

• Never use compressed air or a high pressure pump.
• Do not exceed 4.12 kPa (0.042 kg/cm

2

, 0.6 psi) of pressure in EVAP system.

NOTE:

• Do not start engine.

• Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.

 WITH CONSULT-IIl

1. Attach the EVAP service port adapter securely to the EVAP service port.

2. Also attach the pressure pump and hose to the EVAP service port adapter.

3. Turn ignition switch ON.

4. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT MODE” with CONSULT-IIl.

5. Touch “START”. A bar graph (Pressure indicating display) will appear on the screen.

6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar

graph.

7. Remove EVAP service port adapter and hose with pressure pump.

8. Locate the leak using a leak detector. Refer to 

EC-37, "Descrip-

tion"

.

 WITHOUT CONSULT-IIl

1. Attach the EVAP service port adapter securely to the EVAP ser-

vice port.

2. Also attach the pressure pump with pressure gauge to the EVAP

service port adapter.

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BBIA0366E

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