Nissan Altima HL32 Hybrid. Manual - part 377

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COMPRESSION PRESSURE

COMPRESSION PRESSURE

Compression Pressure

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CHECKING COMPRESSION PRESSURE

1. Connect CONSULT-III.
2. Set in the inspection mode (mode 1). Refer to 

HBC-104, "MODE 1 : Diagnosis Description"

.

3. Warm up the engine to full operating temperature. 
4. Release the fuel pressure.

NOTE:

If following procedure performed, a certain DTC may be detected.

a. Turn ignition switch OFF.
b. Remove fuel pump fuse located in IPDM E/R.
c.

Turn ignition switch ON (READY).

d. Depress the accelerator pedal and keep it.
e. After engine stalls, turn ignition switch OFF.
5. Remove the ignition coil and spark plug from each cylinder.

Refer to 

EM-12, "Removal and Installation"

.

6. Disconnect the fuel injector harness connector to avoid any residual fuel injection during the measure-

ment.

7. Install the compression tester with the adapter into the spark

plug hole.

• Use compression gauge whose picking up end inserted to spark

plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it

may be caught by cylinder head during removal.

8. With CONSULT-III crank over the engine. Refer to 

HBC-81, "CONSULT-III Function"

.

• When the gauge pointer stabilizes, read the compression pressure and engine rpm. Perform these

steps to check each cylinder.

Unit: kPa (kg/cm

2

, psi) / rpm

CAUTION:

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

KBIA0130E

SEM387C

Standard

Minimum

Difference limit between cylinders

          900 (9.2, 130.5) / 250

            710 (7.3, 103) / 250

                                      100 (1.0, 14) / 250

COMPRESSION PRESSURE

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

charged battery. 

• If compression pressure is below minimum value, check valve clearances and parts associated with com-

bustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head gasket).

After the checking, measure compression pressure again.

• If some cylinders have low compression pressure, pour 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, the piston rings may be worn or damaged. Check the pis-

ton rings and replace if necessary.

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

functioning. 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, the head gasket is leaking. In such a case, replace the cylinder head

gasket.

9. Install spark plug, ignition coil, fuel pump fuse and harness connectors.

EM-24

< ON-VEHICLE REPAIR >

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AIR CLEANER AND AIR DUCT

ON-VEHICLE REPAIR

AIR CLEANER AND AIR DUCT

Removal and Installation

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REMOVAL

1. Remove front air duct.
2. Disconnect the air duct hose clamps at the electronic throttle control actuator and the air cleaner assem-

bly.

3. Disconnect the mass air flow sensor
4. Remove mass air flow sensor from air cleaner assembly, as necessary.

CAUTION:

Handle the mass air flow sensor with care:

• Do not shock it.

• Do not disassemble it.

• Do not touch the internal sensor.

5. Remove the air cleaner assembly.

INSTALLATION

Installation is in the reverse order of removal.

AWBIA0048ZZ

1.

Air duct hose

2.    Front air duct

3.

Air cleaner mounting bracket

4.

Air cleaner assembly

5.

Mass air flow sensor

A. To electronic throttle control actuator

INTAKE MANIFOLD

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INTAKE MANIFOLD

Removal and Installation

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REMOVAL

WARNING:

To avoid the danger of being scalded, never drain the coolant when the engine is hot.
1. Release the fuel pressure. Refer to 

EC-465, "Inspection"

.

2. Drain coolant when engine is cooled. Refer to 

CO-11, "Changing Engine Coolant"

.

3. Disconnect the MAF sensor electrical connector.
4. Remove air cleaner and air duct assembly. Refer to 

EM-24, "Removal and Installation"

.

5. Remove cowl top finisher. Refer to 

EXT-17, "Removal and Installation"

.

6. Disconnect the following components at the intake side:

• PCV hose

• EVAP hose and EVAP canister purge volume control solenoid

• Electronic throttle control actuator

7. Disconnect the fuel quick connector on the engine side.

• Using Tool perform the following steps to disconnect the quick connector. 

AWBIA0589GB

1.

Intake manifold

2.

Rubber seal

3.

Intake manifold adapter

4.

Gasket

5.

Electric throttle control actuator

6.

Rubber seal

7.

EVAP hose

8.

EVAP canister purge volume control 
solenoid valve

Tool number

: 16441 6N210 (J-45488)