Nissan Maxima. Manual - part 527

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FUEL PRESSURE

PERIODIC MAINTENANCE

FUEL PRESSURE

Inspection

INFOID:0000000010095254

FUEL PRESSURE RELEASE

 With CONSULT

1. Turn ignition switch ON.
2. Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT.
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

1. Remove fuel pump fuse located in IPDM E/R. Refer to 

FL-6, "Removal and Installation"

.

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.

NOTE:

• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel

pressure cannot be completely released because A35 models do not have fuel return system.

• Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick

connector o-ring maintains seal ability.

• Use Fuel Pressure Gauge Kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-44321-6)] to check

fuel pressure.

1. Release fuel pressure to zero.
2. Remove fuel hose using Quick Connector Release [SST (J-45488)]. Refer to 

FL-10, "Exploded View"

.

• Do not twist or kink fuel hose because it is plastic hose.

• Do not remove fuel hose (3) from quick connector.

• Keep fuel hose connections clean.

3. Install Fuel Pressure Adapter [SST (J-44321-6)] (2) and Fuel

Pressure Gauge kit [SST (J44321)] (1) 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.

4. Turn ignition switch ON (reactivate fuel pump) and check for fuel

leakage.

5. Start engine and check for fuel leakage.
6. Read the indication of fuel pressure gauge kit [SST (J-44321)].

• During fuel pressure check, check for fuel leakage from fuel

connection every 3 minutes.

7. If result is unsatisfactory, go to next step.
8. Check the following.

• Fuel hoses and fuel tubes for clogging

• Fuel filter for clogging

• Fuel pump

At idling : Approximately 350 kPa (3.57 kg/cm

2

, 51 psi)

ALBIA0614ZZ

FUEL PRESSURE

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• Fuel pressure regulator for clogging

9. If OK, replace fuel pressure regulator.

If NG, repair or replace malfunctioning part.

10. Before disconnecting Fuel Pressure Gauge kit [SST (J-44321)] and Fuel Pressure Adapter [SST (J-

44321-6)], release fuel pressure to zero.

EC-594

< PERIODIC MAINTENANCE >

[VQ35DE]

EVAP LEAK CHECK

EVAP LEAK CHECK

Inspection

INFOID:0000000010095255

CAUTION:

• Never use compressed air or a high pressure pump.
• Never 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 (commercial service tool) to the EVAP service port may

cause a leakage.

 WITH CONSULT

1. To locate the EVAP leakage, install EVAP service port adapter

(commercial service tool) and pressure pump to EVAP service

port.

2. Turn ignition switch ON.
3. Select the “EVAP SYSTEM CLOSE” of “WORK SUPPORT

MODE” with CONSULT.

4. Touch “START”. A bar graph (Pressure indicating display) will

appear on the screen.

5. Apply positive pressure to the EVAP system until the pressure

indicator reaches the middle of the bar graph.

6. Remove EVAP service port adapter (commercial service tool)

and hose with pressure pump.

7. Locate the leakage using a leakage detector (commercial ser-

vice tool). Refer to 

EC-94, "System Diagram"

.

 WITHOUT CONSULT

1. To locate the EVAP leakage, install EVAP service port adapter

(commercial service tool) and pressure pump to EVAP service

port.

2. Apply battery voltage between the terminals of EVAP canister

vent control valve to make a closed EVAP system.

3. To locate the leakage, deliver positive pressure to the EVAP sys-

tem until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to
0.028 kg/cm

2

, 0.2 to 0.4 psi).

4. Remove EVAP service port adapter (commercial service tool)

and hose with pressure pump.

SEF462UA

SEF200U

SEF462UA

EVAP LEAK CHECK

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5. Locate the leakage using a leakage detector (commercial ser-

vice tool). Refer to 

EC-94, "System Diagram"

.

SEF200U