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Infiniti QX56 (JA60). Manual - part 468

EM-26

< ON-VEHICLE REPAIR >

INTAKE MANIFOLD

INTAKE MANIFOLD

Exploded View

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Removal and Installation

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REMOVAL

1. Partially drain the engine coolant. Refer to

CO-11, "Changing Engine Coolant"

WARNING:

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

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

EM-24, "Removal and Installation"

3. Release the fuel pressure. Refer to

EC-489, "Fuel Pressure Check"

4. Disconnect the negative battery terminal. Refer to

PG-74, "Removal and Installation"

5. Remove the air duct and resonator assembly. Refer to

EM-25, "Removal and Installation"

Intake manifold

PCV hose

Gasket

Electric throttle control actuator

Water hose

PCV hose

EVAP hose

EVAP canister purge control solenoid
valve

10.

Bracket

11.

Gasket

KBIA2461E

INTAKE MANIFOLD

EM-27

< ON-VEHICLE REPAIR >

6. Disconnect the fuel tube quick connector on the engine side in

the following steps.

a. Remove quick connector cap (engine side only).

b. With the sleeve side of Tool facing quick connector, install Tool

onto fuel tube.

c. Insert Tool into quick connector until sleeve contacts and goes

no further. Hold the Tool in that position.

CAUTION:

Inserting the Tool hard will not disconnect quick connector.

Hold Tool where it contacts and goes no further.

d. Draw and pull out quick connector straight from fuel tube.

CAUTION:

• Pull quick connector holding "A" position in illustration.

• Do not pull with lateral force applied. O-ring inside quick connector may be damaged.

• Prepare container and cloth beforehand as fuel will leak out.

• Avoid fire and sparks.

• Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage

and entry of foreign materials.

7. Remove or disconnect harnesses, brackets, vacuum hose, vacuum gallery and PCV hose and tube from

intake manifold.

8. Remove the EVAP canister purge control solenoid valve, if necessary.
9. Remove electric throttle control actuator by loosening bolts diagonally.

CAUTION:

• Handle carefully to avoid any damage to the electric throttle control actuator.

• Do not disassemble.

10. Remove the fuel injectors and fuel tube assembly. Refer to

EM-40, "Removal and Installation"

LBIA0395E

SBIA0354E

Tool number

: 16441 6N210 (J-45488)

WBIA0604E

EM-28

< ON-VEHICLE REPAIR >

INTAKE MANIFOLD

11. Loosen the bolts in reverse order shown using power tool.
12. Remove the intake manifold.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

• Clean all gasket mating surfaces, do not reuse gaskets.

INSTALLATION

Installation is in the reverse order of removal.

• Tighten the intake manifold bolts in numerical order as shown.

• Install the EVAP canister purge control solenoid valve connector with it facing front of engine.

• Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and diago-

nally in several steps.

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

• Install the water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26

in) (target: 27 mm 1.06 in).

Connecting Quick Connector of Fuel Tube

Install quick connector as follows (the steps are the same for quick connectors on both engine side and vehi-

cle side except for the quick connector cap).
1. Make sure no foreign substances are deposited in and around tube and quick connector, and they are not

damaged.

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

• Insert until the paint mark for engagement identification (white)

goes completely inside quick connector so that you cannot see

it from the straight side of the connected part. Use a mirror to

check this where it is not possible to view directly from the

straight side, such as quick connector on vehicle side.

KBIA2462E

PBIC0017E

INTAKE MANIFOLD

EM-29

< ON-VEHICLE REPAIR >

• Insert fuel tube into quick connector until top spool is com-

pletely inside quick connector, and 2nd level spool exposes

right below quick connector on engine side.

CAUTION:

• Hold "A" position in illustration when inserting fuel tube

into quick connector.

• Carefully align center to avoid inclined insertion to pre-

vent damage to O-ring inside quick connector.

• Insert 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. Pull quick connector by hand holding "A" position. Make sure it is completely engaged (connected) so that

it does not come out from fuel tube.

NOTE:

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

5. Install the quick connector cap on the quick connector joint (on

engine side only).

6. Install the fuel hose and tube to hose clamps.
7. Refill the engine coolant. Refer to

CO-11, "Changing Engine

Coolant"

INSPECTION AFTER INSTALLATION

• After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.

- Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel

leaks at connections.

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

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

EC-18,

"Throttle Valve Closed Position Learning"

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

ing repairs. Refer to

EC-18, "Idle Air Volume Learning"

KBIA0272E

SBIA0354E

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