Nissan Pathfinder (2011 year). Manual - part 364

COMPRESSION PRESSURE

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COMPRESSION PRESSURE

Compression Pressure

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CHECKING COMPRESSION PRESSURE

1. Warm up engine thoroughly. 
2. Release fuel pressure. Refer to 

EC-484, "Fuel Pressure Check"

.

3. Disconnect fuel pump fuse to avoid fuel injection during mea-

surement.

4. Remove intake manifold collector. Refer to 

EM-27, "Removal and Installation"

.

5. Remove spark plug from each cylinder. Refer to 

EM-17, "Removal and Installation"

.

6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install compression tester with adapter onto spark plug hole.

• Use compression gauge whose pick up end inserted to spark

plug hole is smaller than 20 mm (0.79 in) in diameter. Other-

wise, it may be caught by cylinder head during removal.

8. Turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression

pressure and engine rpm. Perform these steps to check each cylinder.

Compression pressure:

Unit: kPa (kg/cm

2

, psi) /rpm

CAUTION:

Always use a fully charged battery to obtain specified engine speed.

• If the engine speed is out of the specified range, check the battery. Check the engine speed again with a

properly charged battery. 

BBIA0534E

PBIC0900E

SBIA0533E

Standard

Minimum

Differential limit between cylinders

 1,275 (13.0, 185) / 300

981 (10.0, 142) / 300

98 (1.0, 14) / 300

2011 Pathfinder

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COMPRESSION PRESSURE

• If the compression pressure is below the minimum value, check the valve clearances and parts associ-

ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head,

cylinder head gasket). After checking, measure the compression pressure again.

• If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug

hole of the cylinder to re-check it for compression.

- If the added engine oil improves the compression, piston rings may be worn out or damaged. Check the

piston rings and replace if necessary.

- If the compression pressure remains at low level despite the addition of engine oil, the valves may be

malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.

• If two adjacent cylinders have respectively low compression pressure and their compression remains

low even after the addition of engine oil, cylinder head gaskets may be leaking, or a valve in adjacent

cylinders may be damaged. Inspect and repair as required.

• If the compression pressure is below the minimum value, check the valve clearances and parts associ-

ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head,

cylinder head gasket). After checking, measure the compression pressure again.

9. Install the components in the reverse order of removal.
10. Start the engine, and confirm that it runs smoothly.
11. Perform trouble diagnosis. If DTC appears, erase it. Refer to 

EC-86, "Description"

.

2011 Pathfinder

ENGINE ROOM COVER

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REMOVAL AND INSTALLATION

ENGINE ROOM COVER

Removal and Installation

INFOID:0000000006247000

CAUTION:

Do not damage or scratch cover when installing or removing. 

REMOVAL

1. Remove the engine room cover bolts using power tool.
2. Lift up on engine cover firmly to dislodge snap fit mounts.

INSTALLATION

Installation is in the reverse order of removal.

WBIA0622E

2011 Pathfinder

EM-26

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AIR CLEANER AND AIR DUCT

AIR CLEANER AND AIR DUCT

Exploded View

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Removal and Installation

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CAUTION:

Handle mass air flow sensor with care.

• Do not shock it.

• Do not disassemble it.

• Do not touch its sensor.

NOTE:

Add marks as necessary for easier installation.

REMOVAL

1. Remove the engine room cover using power tool. Refer to 

EM-164, "Removal and Installation"

.

2. Disconnect the harness connector from air cleaner case (upper).
3. Disconnect crankcase ventilation hose.
4. Remove the air duct and resonator assembly and air cleaner case (upper).
5. Remove air cleaner filter and air cleaner case (lower).

INSPECTION AFTER REMOVAL

Inspect air duct and resonator assembly for cracks or tears.

• If anything found, replace air duct and resonator assembly.

INSTALLATION

Installation is in the reverse order of removal.

1.

Air cleaner case (lower)

2.

Air cleaner filter

3.

Air cleaner case (upper)

4.

Air duct and resonator assembly

Front

AWBIA0133GB

2011 Pathfinder

INTAKE MANIFOLD COLLECTOR

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INTAKE MANIFOLD COLLECTOR

Exploded View

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Removal and Installation

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REMOVAL

1. Remove engine room cover. Refer to 

EM-25, "Removal and Installation"

.

2. Remove air duct and resonator assembly. Refer to 

EM-26, "Removal and Installation"

.

3. Remove electric throttle control actuator as follows:
a. Partially drain engine coolant. Refer to 

CO-13, "Changing Engine Coolant"

.

WARNING:

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

CAUTION:

• Perform when engine is cold.

• Do not spill engine coolant on drive belt.

b. Disconnect water hoses from electric throttle control actuator.
c. Disconnect harness connector.

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 manifold collector

b.

To power valve

c.

To throttle body

d.

To cylinder head (RH bank)

WBIA0731E

2011 Pathfinder

EM-28

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INTAKE MANIFOLD COLLECTOR

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. 

9. Loosen nuts and bolts in reverse order as shown with power

tool, and remove intake manifold collector.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

Installation is in the reverse order of removal. Note the following:

Intake Manifold Collector

• If stud bolts were removed from intake manifold, install them and tighten to the specified torque.

• Tighten nuts and bolts in numerical order as shown.

PBIC2875E

PBIC2876E

PBIC2877E

Intake manifold collector 
bolts and nuts

: 11.0 N·m (1.1 kg-m, 8 ft-lb)

Stud bolts : 6.9 N·m (0.7 kg-m, 61 in-lb)

PBIC2877E

2011 Pathfinder

INTAKE MANIFOLD COLLECTOR

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Electric Throttle Control Actuator

• Tighten bolts in numerical order as shown.

• Perform the “Throttle Valve Closed Position Learning” when har-

ness connector of electric throttle control actuator is disconnected.

Refer to 

EC-25, "Throttle Valve Closed Position Learning"

.

• Perform the “Idle Air Volume Learning” and “Throttle Valve Closed

Position Learning” when electric throttle control actuator is

replaced. Refer to 

EC-25, "Idle Air Volume Learning"

.

PBIC2875E

2011 Pathfinder

EM-30

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INTAKE MANIFOLD

INTAKE MANIFOLD

Exploded View

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Removal and Installation

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REMOVAL

1. Remove intake manifold collector. Refer to 

EM-27, "Removal and Installation"

.

2. Remove fuel tube and fuel injector assembly. Refer to 

EM-47, "Removal and Installation"

.

3. Loosen nuts and bolts with power tool in reverse order as shown

to remove intake manifold.

4. Remove gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSPECTION AFTER REMOVAL

Surface Distortion

1.

Intake manifold

2.

Gasket

PBIC2878E

PBIC2879E

2011 Pathfinder