Nissan Pathfinder (2008 year). Manual — part 295
PRECAUTIONS
EC-477
< PRECAUTION >
[VQ40DE]
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• Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to
EC-422, "ECM Terminal and Reference Value"
.
• Handle mass air flow sensor carefully to avoid damage.
• Do not clean mass air flow sensor with any type of detergent.
• Do not disassemble electric throttle control actuator.
• Even a slight leak in the air intake system can cause serious
incidents.
• Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
• After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.
• When measuring ECM signals with a circuit tester, never allow
the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
• Do not use ECM ground terminals when measuring input/out-
put voltage. Doing so may result in damage to the ECM's tran-
sistor. Use a ground other than ECM terminals, such as the
ground.
• B1 indicates the bank 1, B2 indicates the bank 2 as shown in
the figure.
MEF040D
SEF217U
SEF348N
SEC893C
EC-478
< PRECAUTION >
[VQ40DE]
PRECAUTIONS
• Do not operate fuel pump when there is no fuel in lines.
• Tighten fuel hose clamps to the specified torque.
• Do not depress accelerator pedal when starting.
• Immediately after starting, do not rev up engine unnecessar-
ily.
• Do not rev up engine just prior to shutdown.
• When installing C.B. ham radio or a mobile phone, be sure to
observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possible from the electronic con-
trol units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
- Adjust the antenna and feeder line so that the standing-wave
radio can be kept smaller.
- Be sure to ground the radio to vehicle body.
BBIA0529E
SEF709Y
SEF708Y
PBIB1512E
PREPARATION
EC-479
< PREPARATION >
[VQ40DE]
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PREPARATION
PREPARATION
Special Service Tool
INFOID:0000000001366285
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
EG17650301
(J-33984-A)
Radiator cap tester
adapter
Adapting radiator cap tester to radiator cap and ra-
diator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
(J-44321)
Fuel pressure gauge
kit
Checking fuel pressure
(J-44321-6)
Fuel pressure adapter
Connecting fuel pressure gauge to quick connec-
tor type fuel lines.
(J-45488)
Quick connector re-
lease
Remove fuel tube quick connectors in engine
room
S-NT564
LEC642
LBIA0376E
PBIC0198E
EC-480
< PREPARATION >
[VQ40DE]
PREPARATION
Commercial Service Tool
INFOID:0000000001366286
Tool name
(Kent-Moore No.)
Description
Leak detector
i.e.: (J-41416)
Locating the EVAP leak
EVAP service port
adapter
i.e.: (J-41413-OBD)
Applying positive pressure through EVAP service
port
Fuel filler cap adapter
i.e.: (MLR-8382)
Checking fuel tank vacuum relief valve opening
pressure
Socket wrench
Removing and installing engine coolant tempera-
ture sensor
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.
S-NT703
S-NT704
S-NT815
S-NT705
AEM488
S-NT779
FUEL PRESSURE
EC-481
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
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ON-VEHICLE MAINTENANCE
FUEL PRESSURE
Fuel Pressure Check
INFOID:0000000001366444
FUEL PRESSURE RELEASE
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT” mode with CONSULT-III.
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-III
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:
Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the quick
connector o-ring maintains sealability.
NOTE:
• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel
pressure cannot be completely released because R51 models do not have fuel return system.
• Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.
1.
Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2.
Remove fuel hose using Quick Connector Release J-45488. Refer to
• 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.
3.
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.
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.
• During fuel pressure check, check for fuel leakage from fuel
connection every 3 minutes.
7.
If result is unsatisfactory, go to next step.
BBIA0534E
At idling:
Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
BBIA0535E
EC-482
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
FUEL PRESSURE
8.
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.
9.
Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure
to zero. Refer to "FUEL PRESSURE RELEASE".
EVAP LEAK CHECK
EC-483
< ON-VEHICLE MAINTENANCE >
[VQ40DE]
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EVAP LEAK CHECK
How to Detect Fuel Vapor Leakage
INFOID:0000000001366385
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-III
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-III.
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
WITHOUT CONSULT-III
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.
3.
Apply battery voltage between the terminals of EVAP canister
vent control valve (3) to make a closed EVAP system.
-
Fuel filler pipe (top of frame view) (1)
-
EVAP control system pressure sensor (2)
-
EVAP ccanister (4)
-
Drain filter (5)
-
: Vehicle front
4.
To locate the leak, deliver positive pressure to the EVAP system
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).
5.
Remove EVAP service port adapter and hose with pressure
pump.
6.
Locate the leak using a leak detector. Refer to
SEF200U
SEF462UA
AWBIA0134ZZ
EC-484
< ON-VEHICLE REPAIR >
[VQ40DE]
EVAP CANISTER
ON-VEHICLE REPAIR
EVAP CANISTER
Component Inspection
INFOID:0000000001366383
EVAP CANISTER
Check EVAP canister as follows:
1.
Block port B.
2.
Blow air into port A and check that it flows freely out of port C.
3.
Release blocked port B.
4.
Apply vacuum pressure to port B and check that vacuum pres-
sure exists at the ports A and C.
5.
Block port A and B.
6.
Apply pressure to port C and check that there is no leakage.
Removal and Installation
INFOID:0000000001366384
EVAP CANISTER
Tighten EVAP canister as shown in the figure.
EVAP CANISTER VENT CONTROL VALVE
1.
Turn EVAP canister vent control valve counterclockwise.
2.
Remove the EVAP canister vent control valve.
Always replace O-ring with a new one.
PBIB2568E
BBIA0566E
BBIA0567E
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