2001 INFINITI QX4 ECU

DUPLICATE THE NOISE AND TEST DRIVENBBT0024S02If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on
the Diagnostic Worksheet regarding the conditions or location of the noise. This information can be used to
duplicate the same conditions when you confirm the repair.
If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle ªtwistº.
5) At idle, apply engine load (electrical load, half-clutch on M/T model, drive position on A/T model).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.
IDrive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.
IIf it is difficult to duplicate the noise, drive the vehicle slowly on an undulating or rough road to stress the
vehicle body.
CHECK RELATED SERVICE BULLETINSNBBT0024S03After verifying the customer concern or symptom, check ASIST for Technical Service Bulletins (TSBs) related
to that concern or symptom.
If a TSB relates to the symptom, follow the procedure to repair the noise.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSENBBT0024S041. Narrow down the noise to a general area. To help pinpoint the source of the noise, use a listening tool
(Chassis Ear: J-39570, Engine Ear: J-39565 and mechanics stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by:
Iremoving the components in the area that you suspect the noise is coming from.
Do not use too much force when removing clips and fasteners, otherwise clips and fastener can
be broken or lost during the repair, resulting in the creation of new noise.
Itapping or pushing/pulling the component that you suspect is causing the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will be eliminated
only temporarily.
Ifeeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the
noise.
Iplacing a piece of paper between components that you suspect are causing the noise.
Ilooking for loose components and contact marks.
Refer to ªGeneric Squeak and Rattle Troubleshootingº, BT-6.
REPAIR THE CAUSENBBT0024S05IIf the cause is a loose component, tighten the component securely.
IIf the cause is insufficient clearance between components:
þ separate components by repositioning or loosening and retightening the component, if possible.
þ insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or ure-
thane tape. A Nissan Squeak and Rattle Kit (J-43980) is available through your authorized Nissan Parts
Department.
CAUTION:
Do not use excessive force as many components are constructed of plastic and may be damaged.
Always check with the Parts Department for the latest parts information.
The following materials are contained in the Nissan Squeak and Rattle Kit (J-43980). Each item can be ordered
separately as needed.
URETHANE PADS [1.5 mm (0.059 in) thick]
Insulates connectors, harness, etc.
76268-9E005: 100 x 135 mm (3.94 x 5.31 in)/76884-71L01: 60 x 85 mm (2.36 x 3.35 in)/76884-71L02: 15 x
25 mm (0.59 x 0.98 in)
INSULATOR (Foam blocks)
Insulates components from contact. Can be used to fill space behind a panel.
73982-9E000: 45 mm (1.77 in) thick, 50 x 50 mm (1.97 x 1.97 in)/73982-50Y00: 10 mm (0.39 in) thick, 50 x
50 mm (1.97 x 1.97 in)
INSULATOR (Light foam block)
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SQUEAK AND RATTLE TROUBLE DIAGNOSES
Work Flow (Cont'd)
BT-5

TRUNK=NBBT0025S04Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINERNBBT0025S05Noises in the sunroof/headliner area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sunvisor shaft shaking in the holder
3. Front or rear windshield touching headliner and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
SEATSNBBT0025S06When isolating seat noises it's important to note the position the seat is in and the load placed on the seat
when the noise is present. These conditions should be duplicated when verifying and isolating the cause of
the noise.
Cause of seat noise include:
1. Headrest rods and holders
2. A squeak between the seat pad cushion and frame
3. The rear seat back lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOODNBBT0025S07Some interior noises may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noises include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.
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SQUEAK AND RATTLE TROUBLE DIAGNOSES
Generic Squeak and Rattle Troubleshooting (Cont'd)
BT-7

Removal and InstallationNBBT0004IWhen removing or installing hood, place a cloth or other padding on front fender panel and cowl top. This
prevents vehicle body from being scratched.
IBumper fascia is made of plastic. Do not use excessive force and be sure to keep oil away from it.
IHood adjustment: Adjust at hinge portion.
IHood lock adjustment: After adjusting, check hood lock control operation. Apply a coat of grease to hood
locks engaging mechanism.
IHood opener: Do not attempt to bend cable forcibly. Doing so increases effort required to unlock hood.
FRONT BUMPER ASSEMBLYNBBT0004S011. Remove screws and clips securing left and right sides of front fender protector.
2. Remove clips securing bumper fascia to radiator core support lower.
3. Remove clips securing radiator grille and remove the radiator grille.
4. Remove finisher and bolts securing left and right fog lamps and remove the lamps.
5. Remove bolts securing left and right radiator grille and remove the radiator grilles.
6. Remove bolts securing license plate bracket and remove the license plate bracket.
7. Remove clips securing bumper fascia to bumper reinforcement.
8. Remove bolts securing front fender to bumper fascia.
9. Extract bumper fascia assembly.
10. Remove bolts and nuts securing bumper reinforcement.
11. Extract bumper reinforcement.
SBT022A
BODY FRONT END
Removal and Installation
BT-12

Removal and InstallationNBBT0005IBumper fascia is made of plastic. Do not use excessive force and be sure to keep oil away from it.
IBack door lock system adjustment: Adjust lock & striker so that they are in the center.
After adjustment, check back door lock operation.
IBack door hatch lock system adjustment: Adjust lock & striker so that they are in the center.
After adjustment, check back door hatch lock operation.
WARNING:
IBe careful not to scratch back door stay and/or back door hatch stay when installing back door
and/or back door hatch. A scratched stay may cause gas leakage.
IThe contents of the back door stay and back door hatch stay are under pressure. Do not take apart,
puncture, apply heat or allow fire near them.
REAR BUMPER ASSEMBLYNBBT0005S011. Remove bolts and screws securing left and right mudguards and remove the mudguards.
2. Remove clips and screws securing left and right sides of wheel protector.
3. Remove clips and bolts securing left and right rear fenders to bumper fascia.
4. Remove bolts securing bumper reinforcement to bumper fascia.
5. Remove clips securing bumper fascia.
6. Extract bumper fascia assembly.
7. Remove bolts and nuts securing bumper reinforcement.
8. Extract bumper reinforcement.
SBT715
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BODY REAR END AND OPENER
Removal and Installation
BT-15

SBT035A
Defroster grille
REMOVAL
Insert a cloth-covered flat-bladed screwdriver into the grilles of the
outside, center and central grilles, respectively, lift up the front of
the grilles and remove.
INSTALLATION
After inserting the front section, insert the rear section (pawls) to
attach.
CAUTION:
Confirm that the pawls at the rear are securely attached.
SBT036A
Side ventilator-left
Insert a cloth-covered flat-bladed screwdriver into the lower
section, and pull out forward.
SBT037A
Side ventilator-right
Insert a cloth-covered flat-bladed screwdriver into the corner of the
lower section, and pull out forward. (Securely press the screwdriver
against the ventilator.) Or, after removing the instrument lower
panel, push the ventilator out from the back.
Side defroster grille
After removing the side ventilator, reach in with hands from the
opening, push on the pawls from behind the grille, and remove by
pushing out.
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INSTRUMENT PANEL ASSEMBLY
Removal and Installation (Cont'd)
BT-27

Removal and InstallationNBBT0010Front Door Trim
1. Remove inside handle escutcheon.
2. Remove power window switch, then disconnect the connectors.
3. Remove door armrest.
4. Remove bolts securing door finisher.
5. Pull on door finisher to remove clips from door panel and remove door finisher, then disconnect glass hatch
and fuel lid opener switch connector.
Rear Door Trim
6. Remove inside handle escutcheon.
7. Remove power window switch, then disconnect the connector.
8. Remove door armrest cap.
9. Remove bolts securing door finisher.
10. Pull on door finisher to remove clips from door panel and remove door finisher.
SBT696
DOOR TRIM
Removal and Installation
BT-30

Removal and InstallationNBBT00111. Remove front and rear seats. Refer to ªFRONT SEATº and ªREAR SEATº for details, BT-41, BT-44.
2. Remove front and rear seat belts. Refer to RS-4 and RS-5, ªFront Seat Beltº and ªRear Seat Beltº for
details.
3. Remove body side trim. Refer to ªSIDE AND FLOOR TRIMº for details, BT-28.
4. Remove roof console assembly.
5. Remove inside mirror assembly.
6. Remove sun visors.
7. Remove interior lamp assembly and luggage room lamp assembly.
8. Remove assist grips.
9. Remove clips securing headlining.
10. Remove rear roof garnish.
11. Remove headlining from vehicle through either back door.
ROOF TRIM
Removal and Installation
BT-32

ADJUSTMENTNBBT0018S03
SBT723
If any gap or height difference between glass lid and roof is found,
check glass lid fit and adjust as follows:
Gap AdjustmentNBBT0018S03011. Open shade assembly.
2. Tilt glass lid up then remove side trim.
3. Loosen glass lid securing nuts (3 each on left and right sides),
then tilt glass lid down.
4. Adjust glass lid from outside of vehicle so it resembles ªA-Aº
as shown in the figure above.
5. Tilt glass lid up and down until it is adjusted to ªB-Bº as shown
in the figure above.
6. After adjusting glass lid, tilt glass lid up and tighten nuts.
7. Tilt glass lid up and down several times to check that it moves
smoothly.
Height Difference AdjustmentNBBT0018S03021. Tilt glass lid up and down.
2. Check height difference between roof panel and glass lid to
see if it is as ªA-Aº as shown in the figure above.
3. If necessary, adjust it by using one of following procedures.
IAdjust by adding or removing adjustment shim(s) between
glass lid and link assembly.
IIf glass lid protrudes above roof panel, add shim(s) or plain
washer(s) at sunroof mounting bracket or stud bolt locations to
adjust sunroof installation as required.
SUNROOF
Trouble Diagnoses (Cont'd)
BT-50