Ac system INFINITI QX4 2001 Factory Service Manual

ACCELERATOR CONTROL, FUEL &
EXHAUST SYSTEMS
SECTION
FE
CONTENTS
PREPARATION...............................................................2
Special Service Tool ....................................................2
Commercial Service Tools ...........................................2
ACCELERATOR CONTROL SYSTEM...........................3
Removal and Installation .............................................3
Adjusting Accelerator Wire ..........................................3FUEL SYSTEM................................................................4
Removal and Installation .............................................4
FUEL TANK...............................................................5
FUEL PUMP AND GAUGE.........................................6
EXHAUST SYSTEM........................................................8
Removal and Installation .............................................8
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Special Service ToolNBFE0001The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
KV10114400 (J38365)
Heated oxygen sensor
wrench
NT636
Loosening or tightening rear heated oxy-
gen sensor (For right bank)
a: 22 mm (0.87 in)
Commercial Service ToolsNBFE0007
Tool number
(Kent-Moore No.)
Tool nameDescription
Oxygen sensor thread
cleaner
(J-43897-18)
(J-43897-12)
NT778
Reconditioning the exhaust system
threads before installing a new oxygen
sensor. Use with anti-seize lubricant
shown below.
a: J-43897-18 (18 mm dia.) for Zirconia
Oxygen Sensor
b: J-43897-12 (12 mm dia.) for Titania
Oxygen Sensor
Anti-seize lubricant (Per-
matex
TM133AR or
equivalent meeting MIL
specification MIL-A-907)
NT779
Lubricating oxygen sensor thread cleaning
tool when reconditioning exhaust system
threads.
PREPARATION
Special Service Tool
FE-2

Removal and InstallationNBFE0002CAUTION:
IWhen removing accelerator wire, make a mark to indicate lock nut's initial position.
ICheck that throttle valve opens fully when accelerator pedal is fully depressed. Also check that it
returns to idle position when pedal is released.
ICheck accelerator control parts for improper contact with any adjacent parts.
IWhen connecting accelerator wire, be careful not to twist or scratch its inner wire.
IRefer to EL-240, ªAUTOMATIC SPEED CONTROL DEVICEº for ASCD wire adjustment.
SFE635A
SEF793W
SFE249AE
Adjusting Accelerator WireNBFE00031. Remove the vacuum hose connected to the throttle opener.
2. Connect suitable vacuum hose to vacuum pump as shown left.
3. Apply vacuum [more than þ40.0 kPa (þ300 mmHg, þ11.81
inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
Make sure that there is clearance between the throttle
drum and rod.
If NG, refer to EC-101, ªBasic Inspectionº.
If OK, go to following step.
4. Loosen lock nut.
5. Tighten accelerator adjusting nut until throttle drum starts to
move.
6. From that position, turn back adjusting nut 1.5 to 2 turns, and
secure lock nut.
7. Release vacuum from the throttle opener.
8. Remove vacuum pump and vacuum hose from the throttle
opener.
9. Reinstall the original vacuum hose to the throttle opener
securely.
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ACCELERATOR CONTROL SYSTEM
Removal and Installation
FE-3

Removal and InstallationNBFE0004WARNING:
When replacing fuel line parts, be sure to observe the follow-
ing:
IPut a ªCAUTION: INFLAMMABLEº sign in workshop.
IDo not smoke while servicing fuel system. Keep open
flames and sparks away from work area.
IBe sure to furnish the workshop with a CO
2fire extin-
guisher.
CAUTION:
IBefore removing fuel line parts, carry out the following
procedures:
a) Put drained fuel in an explosion-proof container and put
lid on securely.
b) Release fuel pressure from fuel line. Refer to MA-16,
ªChanging Fuel Filterº.
c) Disconnect battery ground cable.
IAlways replace O-ring with new ones.
IDo not kink or twist hose and tube when they are installed.
IDo not tighten hose clamps excessively to avoid damag-
ing hoses.
IWhen installing fuel check valve, be careful of its desig-
nated direction. Refer to EC-32, ªEVAPORATIVE EMIS-
SION SYSTEMº.
IAfter installation, run engine and check for fuel leaks at
connections.
FUEL SYSTEM
Removal and Installation
FE-4

SFE419AA
SFE420A
FUEL TANKNBFE0004S011. Release fuel pressure from fuel line.
Refer to MA-16, ªChanging Fuel Filterº.
2. Remove inspection hole cover located behind the rear seat.
3. Disconnect harness connectors under inspection hole cover.
4. Disconnect fuel hoses.
IPut mating marks on hoses for correct installation.
SFE468A
5. Disconnect filler hose, vent hose and evaporation hose at fuel
tank side.
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FUEL SYSTEM
Removal and Installation (Cont'd)
FE-5

SFE422A
6. Remove parking brake wire from fuel tank protector.
7. Remove fuel tank protector.
SFE469A
8. Remove fuel tank band mounting bolts while supporting fuel
tank.
9. Remove fuel tank.
Installation procedure is the reverse order of removal.
FUEL PUMP AND GAUGENBFE0004S02
SFE541A
1. Release fuel pressure from fuel line.
Refer to MA-16, ªChanging Fuel Filterº.
2. Remove inspection hole cover located behind the rear seat.
3. Disconnect harness connectors and fuel tubes from upper
plate of fuel gauge.
IPut mating marks on tubes for correct installation.
4. Remove fuel gauge retainer and fuel gauge.
FUEL SYSTEM
Removal and Installation (Cont'd)
FE-6

SFE544A
5. Disconnect the quick connectors as follows.
1) Put mating marks on tubes and connectors for correct instal-
lation.
2) Hold the sides of the connector, push in tabs, and pull out the
tube inserted in the retainer.
CAUTION:
IThe tube can be removed when the push in tabs are com-
pletely depressed. Do not twist it more than necessary.
IDo not use any tools to remove the quick connector.
IKeep the connecting portion of the tubes and quick con-
nectors clean.
SFE425A
6. Remove fuel pump with bracket while lifting the pawl of the fuel
pump bracket upward.
AFE113
7. To install, reverse the removal procedure. Connect the quick
connectors as follows.
IBe sure that the connecting portion is clean and smooth.
IAlign mating marks.
IInsert tube into the center of the connector until you hear a
click.
AFE114
After connecting quick connectors, make sure the connection is
firmly made using the following method.
IPull on the fuel tube and connector to make sure they are firmly
connected.
IStart the engine, increase engine speed and verify that there
are no leaks.
SFE428A
IInstall fuel gauge as shown.
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FUEL SYSTEM
Removal and Installation (Cont'd)
FE-7

Removal and InstallationNBFE0005CAUTION:
IAlways replace exhaust gaskets with new ones when reassembling.
IWith engine running, check all tube connections for exhaust gas leaks, and entire system for
unusual noises.
ICheck to ensure that mounting brackets and mounting insulators are installed properly and free
from undue stress. Improper installation could result in excessive noise or vibration.
IDiscard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
IBefore installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 of J-43897-12 and approved anti-seize lubricant.
IDo not overtorque the oxygen sensor. Doing so may cause damage to the oxygen sensor, result-
ing in the MIL coming on.
EXHAUST SYSTEM
Removal and Installation
FE-8

SFE636A
1. Heated oxygen sensor 2 (rear)
(bank 1)
2. Front tube
3. Heated oxygen sensor 2 (rear)
(bank 2)4. Dynamic damper (If so equipped)
5. Mounting rubber
6. Clamp
7. Mounting bracket8. Mounting rubber
9. Main muffler
10. Post muffler
11. TWC (under floor)
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EXHAUST SYSTEM
Removal and Installation (Cont'd)
FE-9

SFE652A
1. Heated oxygen sensor 2 (rear)
(bank 1)
2. Front tube
3. Heated oxygen sensor 2 (rear)
(bank 2)4. Mounting bracket
5. Mounting rubber
6. Main muffler7. Post muffler
8. Dynamic damper (If so equipped)
9. TWC (under floor)
EXHAUST SYSTEM
Removal and Installation (Cont'd)
FE-10