Nissan Pathfinder (2006 year). Manual - part 233

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

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2006 Pathfinder

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

PFP:00003

NVH Troubleshooting —Engine Noise

EBS00QBH

PBIC2873E

EM-12

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

2006 Pathfinder

Use the Chart Below to Help You Find the Cause of the Symptom

EBS00QBI

1.

Locate the area where noise occurs.

2.

Confirm the type of noise.

3.

Specify the operating condition of engine.

4.

Check specified noise source.

If necessary, repair or replace these parts.

A: Closely related

B: Related

C: Sometimes related

—: Not related

Location 

of noise

Type of 

noise

Operating condition of engine

Source of 

noise

Check item

Refer-

ence page

Before 

warm-

up

After 

warm-

up

When 

start-

ing

When 

idling

When 

racing

While 

driving

Top of 
engine
Rocker 
cover
Cylinder 
head

Ticking or 
clicking

C

A

—

A

B

—

Tappet 
noise

Valve clearance

EM-84

Rattle

C

A

—

A

B

C

Camshaft 
bearing 
noise

Camshaft runout
Camshaft journal oil 
clearance

EM-77
EM-77

Crank-
shaft pul-
ley
Cylinder 
block 
(Side of 
engine)
Oil pan

Slap or 
knock

—

A

—

B

B

—

Piston pin 
noise

Piston to piston pin oil 
clearance
Connecting rod bush-
ing oil clearance

EM-123

 

EM-125

Slap or 
rap

A

—

—

B

B

A

Piston 
slap noise

Piston to cylinder bore 
clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend 
and torsion

EM-127
EM-124
EM-124
EM-125

Knock

A

B

C

B

B

B

Connect-
ing rod 
bearing 
noise

Connecting rod bush-
ing oil clearance
Connecting rod bear-
ing oil clearance

EM-125
EM-129

Knock

A

B

—

A

B

C

Main 
bearing 
noise

Main bearing oil clear-
ance
Crankshaft runout

EM-130
EM-129

Front of 
engine
Timing 
chain 
case

Tapping or 
ticking

A

A

—

B

B

B

Timing 
chain and 
chain ten-
sioner 
noise

Timing chain cracks 
and wear
Timing chain tensioner 
operation

EM-63
EM-55

Front of 
engine

Squeak-
ing or fizz-
ing

A

B

—

B

—

C

Drive belts 
(Sticking 
or slip-
ping)

Drive belts deflection

EM-14

Creaking

A

B

A

B

A

B

Drive belts 
(Slipping)

Idler pulley bearing 
operation

Squall
Creak

A

B

—

B

A

B

Water 
pump 
noise

Water pump operation

CO-19

ENGINE ROOM COVER

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2006 Pathfinder

ENGINE ROOM COVER

PFP:14049

Removal and Installation

EBS00QBJ

REMOVAL

1.

Remove bolts using power tool.

2.

Lift up on engine cover firmly to dislodge snap fit mounts.

CAUTION:

Do not damage or scratch cover when installing or remov-
ing. 

INSTALLATION

Installation is in the reverse order of removal.

WBIA0622E

EM-14

DRIVE BELTS

2006 Pathfinder

DRIVE BELTS

PFP:02117

Checking Drive Belts

EBS00QBK

WARNING:

Be sure to perform when the engine is stopped.

1.

Remove air duct and resonator assembly (inlet) when inspecting drive belt. Refer to 

EM-16, "REMOVAL"

 .

2.

Visually check entire belt for wear, damage or cracks.

Tension Adjustment

EBS00QBL

Belt tensioning is not necessary, as it is automatically adjusted by auto tensioner.

Removal and Installation

EBS00QBM

DRIVE BELT
Removal

1.

Remove air duct and resonator assembly (inlet). Refer to 

EM-16, "REMOVAL"

 .

2.

Rotate the drive belt auto tensioner in the direction of arrow
(loosening direction of tensioner) as shown, using suitable tool.

CAUTION:

Avoid placing hand in a location where pinching may occur
if the tool accidentally comes off.

3.

Remove the drive belt. 

LBIA0427E

1.

Drive belt

2.

Power steering oil pump pulley

3.

Generator pulley

4.

Crankshaft pulley

5.

A/C compressor

6.

Cooling fan pulley

7.

Idler pulley

8.

Drive belt tensioner

LBIA0428E

DRIVE BELTS

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2006 Pathfinder

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Make sure belt is securely installed around all pulleys.

Drive Belt Auto Tensioner and Idler Pulley

EBS00QBN

REMOVAL

1.

Remove air duct and resonator assembly (inlet). Refer to 

EM-16, "REMOVAL"

 .

2.

Remove drive belt. Refer to 

EM-14, "Removal"

 .

3.

Remove radiator cooling fan assembly. Refer to 

CO-17, "REMOVAL"

 .

4.

Remove auto tensioner and idler pulley using power tool.

INSTALLATION

Installation is in the reverse order of removal.

LBIA0429E

1.

Idler pulley

2.

Drive belt auto tensioner

EM-16

AIR CLEANER AND AIR DUCT

2006 Pathfinder

AIR CLEANER AND AIR DUCT

PFP:16500

Removal and Installation

EBS00QBO

REMOVAL

1.

Disconnect harness connector from mass air flow sensor.

2.

Disconnect PCV hose.

3.

Remove air cleaner case/mass air flow sensor assembly and air duct assembly disconnecting their joints.

●

Add marks as necessary for easier installation.

CAUTION:

Handle mass air flow sensor with care.

●

Do not shock it.

●

Do not disassemble it.

●

Do not touch its sensor.

INSPECTION AFTER REMOVAL

Inspect air duct for crack or tear.

●

If anything found, replace air duct.

INSTALLATION

Installation is in the reverse order of removal.

●

Align marks. Attach each joint. Screw clamps firmly.

Changing Air Cleaner Filter

EBS00QBP

REMOVAL

1.

Unhook clips, and lift air cleaner case (upper).

2.

Remove air cleaner filter.

INSTALLATION

Installation is in the reverse order of removal.

1.

Air duct and resonator

2.

Air cleaner case (upper)

3.

Air cleaner filter

4.

Air cleaner case (lower)

WBIA0623E

INTAKE MANIFOLD COLLECTOR

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2006 Pathfinder

INTAKE MANIFOLD COLLECTOR

PFP:14003

Removal and Installation

EBS00QBQ

1.

Vacuum tank

2.

VIAS control solenoid valve

3.

Vacuum hose

4.

Intake manifold collector support

5.

Water hose

6.

Electric throttle control actuator

7.

Water hose

8.

EVAP hose

9.

Bracket

10. EVAP hose

11.

EVAP canister purge volume control 
solenoid valve

12. Gasket

13. Gasket

14. Intake manifold collector

15. Clip

16. PCV hose

17. Connector

18. PCV hose

a.

To intake manifol collector

b.

To power valve

c.

To throttle body

d.

To cylinder head (RH bank)

WBIA0731E

EM-18

INTAKE MANIFOLD COLLECTOR

2006 Pathfinder

REMOVAL

WARNING:

To avoid the danger of being scalded, never drain engine coolant when engine is hot.

1.

Remove engine cover. Refer to 

EM-13, "REMOVAL"

 .

2.

Remove air cleaner case (upper) with mass air flow sensor and air duct assembly. Refer to 

EM-16,

"REMOVAL"

 .

3.

Remove electric throttle control actuator as follows:

a.

Drain engine coolant, or when water hoses are disconnected, attach plug to prevent engine coolant leak-
age. Refer to 

MA-13, "Changing Engine Coolant"

 .

CAUTION:

●

Perform when engine is cold.

●

Do not spill engine coolant on drive belt.

b.

Disconnect water hoses from electric throttle control actuator.

●

When engine coolant is not drained from radiator, attach plug to water hoses to prevent engine coolant
leakage.

c.

Disconnect harness connector.

d.

Loosen bolts in reverse order as shown.

CAUTION:

●

Handle carefully to avoid any shock to electric throttle
control actuator.

●

Do not disassemble.

4.

Remove the following parts:

●

Vacuum hose (to brake booster)

●

PCV hose

5.

Loosen bolts in reverse order as shown to remove intake mani-
fold collector support.

6.

Disconnect EVAP hoses and harness connector from EVAP canister purge volume control solenoid valve.

7.

Remove EVAP canister purge volume control solenoid valve.

8.

Remove VIAS control solenoid valve and vacuum tank.

●

Add mating marks as necessary for easier installation. 

PBIC2875E

PBIC2876E