Nissan Altima L32. Manual - part 623

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INTAKE MANIFOLD

11. Remove the bolts and nuts in the order shown and remove the

intake manifold assembly, using power tools.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

Inspection After Removal

Surface Distortion

• Using straightedge and feeler gauge, inspect surface distortion of intake manifold adapter and intake mani-

fold surface. Refer to 

EM-99, "Standard and Limit"

.

INSTALLATION

Installation is in the reverse order of removal. Follow the tightening sequences below.

Tightening Intake Manifold Bolts and Nuts

• Tighten in numerical order as shown.

CAUTION:

After tightening the five bolts in the order shown, the 1, 6

position designates that the first bolt tightened is to be

retightened to specification.

• Installation of Electric Throttle Control Actuator:

- Tighten the bolts of electric throttle control actuator equally and diagonally in several steps.

- After installation perform procedure in "INSPECTION AFTER INSTALLATION".

CONNECTING QUICK CONNECTOR ON THE FUEL HOSE (ENGINE SIDE)

1. Make sure no foreign substances are deposited in and around the fuel tube and quick connector, and

there is no damage to them. 

2. Thinly apply new engine oil around the fuel tube tip end.
3. Align center to insert quick connector straight into fuel tube.

• Insert fuel tube into quick connector until the top spool on fuel

tubes is inserted completely and the second level spool is

positioned slightly below the quick connector bottom end.

CAUTION:

• Hold at position (A) as shown, when inserting the fuel

tube into the quick connector.

• Carefully align to center to avoid inclined insertion to pre-

vent damage to the O-ring inside the quick connector.

• Insert the fuel tube until you hear a “click” sound and

actually feel the engagement.

• To avoid misidentification of engagement with a similar

sound, be sure to perform the next step.

4. Before clamping the fuel hose with the hose clamp, pull the quick connector hard by hand, holding at the

(A) position, as shown. Make sure it is completely engaged (connected) so that it does not come off of the

fuel tube. 

NOTE:

Recommended pulling force is 50 N (5.1 kg, 11.2 lb).

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INTAKE MANIFOLD

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5. Install quick connector cap on quick connector joint.

• Direct arrow mark on quick connector cap to upper side (fuel

hose side).

6. Install fuel hose to hose clamp.

CONNECTING QUICK CONNECTOR ON THE FUEL HOSE (VEHICLE PIPING SIDE)

1. Make sure no foreign substances are deposited in and around the fuel tube and quick connector, and

there is no damage to them. 

2. Align center to insert quick connector straight into fuel tube.

• Insert fuel tube until a click is heard. 

• Install quick connector cap on quick connector joint. Direct

arrow mark on quick connector cap upper side.

• Install fuel hose to hose clamp.

INSPECTION AFTER INSTALLATION

Make sure there is no fuel leakage at connections as follows:
1. Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel

leaks at connections. 

2. Start the engine and rev it up and check for fuel leaks at connections.

• Perform procedures for “Throttle Valve Closed Position Learning” after finishing repairs. Refer to 

EC-29,

"THROTTLE VALVE CLOSED POSITION LEARNING : Description"

 (California), 

EC-565, "THROTTLE

VALVE CLOSED POSITION LEARNING : Description"

 (Except California).

• If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after

finishing repairs. Refer to 

EC-30, "IDLE AIR VOLUME LEARNING : Description"

 (California), 

EC-566,

"IDLE AIR VOLUME LEARNING : Description"

 (Except California).

WARNING:

Do not touch engine immediately after stopping as engine is extremely hot.

NOTE:

Use mirrors for checking on connections out of the direct line of sight.

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EXHAUST MANIFOLD AND THREE WAY CATALYST

EXHAUST MANIFOLD AND THREE WAY CATALYST

Removal and Installation

INFOID:0000000004202117

REMOVAL

1. Remove the engine undercover using power tools.
2. Disconnect the electrical connector of air fuel ratio (A/F) sensor 1, and unhook the harness from the

bracket and middle clamp on the cover.

3. Remove the air fuel ratio (A/F) sensor 1 using Tools.

CAUTION:

• Be careful not to damage air fuel ratio (A/F) sensor.

• Discard any air fuel ratio (A/F) 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; replace with a new one.

4. Remove the exhaust manifold cover (lower).
5. Remove the exhaust front tube. Refer to 

EX-6, "Removal and Installation"

.

6. Remove the exhaust manifold cover (upper).

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1.

Exhaust manifold cover (upper)

2.

Exhaust manifold stay

3.

Manifold yoke (type B)

4.

Manifold yoke (type A)

5.

Exhaust manifold cover (lower) 

6.

Exhaust manifold and three way catalyst 
assembly

7.

Exhaust manifold gasket

8.

Air fuel ratio (A/F) sensor 1 

A. To cylinder head

Tool numbers

: 

—

 (J-44626)

: KV10117100 (J-36471-A)

EXHAUST MANIFOLD AND THREE WAY CATALYST

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7. Loosen the nuts in the reverse order as shown, on the exhaust

manifold and three way catalyst assembly.

8. Remove the exhaust manifold and three way catalyst assembly

and gasket. Discard the gasket.

INSPECTION AFTER REMOVAL

Surface Distortion

• Use a reliable straightedge and feeler gauge to check the flatness

of exhaust manifold fitting surface.

INSTALLATION

Installation is in the reverse order of removal.

Tightening Exhaust Manifold Nuts

• Tighten the nuts to specification in the numerical order shown, on

the exhaust manifold and three way catalyst assembly. 

Installation of Air Fuel Ratio (A/F) Sensor 1

Clean the air fuel ratio (A/F) sensor 1 threads with the Tool, then apply the anti-seize lubricant to the threads

before installing the air fuel ratio (A/F) sensor 1.

CAUTION:

Do not over-tighten the air fuel ratio (A/F) sensor 1. Doing so may cause damage to the air fuel ratio (A/

F) sensor 1, resulting in a malfunction and the MIL coming on.

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Limit

: 0.3 mm (0.012 in)

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Tool number

: J-43897 - 18
: J-43897 - 12