Infiniti FX35 / FX45. Manual - part 665

INTAKE MANIFOLD

EM-177

< SERVICE INFORMATION >

[VK45DE]

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5.

Disconnect fuel feed hose quick connector on engine side.
Refer to 

EM-190, "Component"

.

6.

Remove fuel damper and fuel hose assembly. Refer to 

EM-190, "Component"

.

CAUTION:

• While hoses are disconnected, plug them to prevent fuel from draining.
• Do not separate fuel damper and fuel hose.

7.

Remove or disconnect harnesses, engine cover bracket (RH and LH), vacuum hose, EVAP tube and hose
and PCV hose and tube from intake manifold (upper).

8.

Loosen mounting bolts in reverse order as shown in the figure to
remove intake manifold (upper) with power tool.

9.

Remove electric throttle control actuator as follows:

a.

Disconnect harness connector.

b.

Loosen mounting bolts diagonally.

CAUTION:

• Handle carefully to avoid any shock to electric throttle control actuator.
• Do not disassemble.

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

EM-190, "Component"

.

11. Disconnect water hoses from intake manifold adaptor.

12. Loosen mounting bolts in reverse order as shown in the figure to

remove intake manifold (lower) with power tool.

13. Remove intake manifold adaptor from intake manifold (lower).

14. Remove intake manifold gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSPECTION AFTER REMOVAL

Surface Distortion

PBIC4552E

: Engine front

PBIC3297E

: Engine front

PBIC3298E

EM-178

< SERVICE INFORMATION >

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INTAKE MANIFOLD

• Check the surface distortion of both the intake manifold (upper and

lower) mating surfaces with straightedge and feeler gauge.

• If it exceeds the limit, replace intake manifolds (lower and/or

upper).

INSTALLATION

Note the following, and install in the reverse order of removal.

Intake Manifold (Lower)

Tighten in numerical order as shown in the figure.

• There are two types of mounting bolts. Refer to the following for

locating bolts.

Intake Manifold (Upper)

Tighten in numerical order as shown in the figure.

Electric Throttle Control Actuator

• Install gasket with its directional protrusion set up/downward.
• Tighten mounting bolts of electric throttle control actuator equally and diagonally in several steps.
• After installation perform procedure in "INSPECTION AFTER INSTALLATION".

Water Hose

Insert hose by 27 to 32 mm (1.06 to 1.26 in) from connector end.

Vacuum Hose

Refer to 

EC-684, "Vacuum Hose Drawing"

.

INSPECTION AFTER INSTALLATION

• Perform the “Throttle Valve Closed Position Learning” when harness connector of electric throttle control

actuator is disconnected. Refer to 

EC-663, "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-663, "Idle Air Volume Learning"

.

Limit

: 0.1 mm (0.004 in)

PBIC0016E

: Engine front

M8 

×

 90 mm (3.54 in)

: 7, 8

M8 

×

 35 mm (1.38 in)

: Except the above

PBIC3298E

: Engine front

PBIC3297E

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-179

< SERVICE INFORMATION >

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EXHAUST MANIFOLD AND THREE WAY CATALYST

Component

INFOID:0000000001325776

• Refer to 

GI-8, "Component"

 for symbols in the figure.

Removal and Installation

INFOID:0000000001325777

REMOVAL

WARNING:

Perform the work, when the exhaust and cooling system have completely cooled down.

1.

Remove engine cover with power tool. Refer to 

EM-169, "Component"

.

2.

Remove front and rear engine undercovers with power tool.

3.

Remove air duct (inlet), air cleaner case and mass air flow sensor assembly, air duct and resonator
assembly. Refer to 

EM-173, "Component"

.

4.

Remove front cross bar. Refer to 

FSU-5, "On-Vehicle Inspection and Service"

.

5.

Drain engine coolant from radiator. Refer to 

CO-37, "Changing Engine Coolant"

.

CAUTION:

• Perform this step when engine is cold.
• Do not spill engine coolant on drive belts.

1.

Air fuel ratio sensor 1 (bank 2)

2.

Exhaust manifold cover (right bank)

3.

Exhaust manifold  (right bank)

4.

Gasket

5.

Exhaust manifold (left bank)

6.

Exhaust manifold cover (left bank)

7.

Air fuel ratio sensor 1 (bank 1)

8.

Three way catalyst cover (right bank) 9.

Three way catalyst (right bank)

10. Heated oxygen sensor 2 (bank 2)

11. Gasket

12.

Three way catalyst cover (left bank)

13. Heated oxygen sensor 2 (bank 1)

14. Three way catalyst (left bank)

15.

Mounting bracket

16. Mounting bracket

A.

Protrusion for installation confirma-
tion.

: Above

PBIC4549E

EM-180

< SERVICE INFORMATION >

[VK45DE]

EXHAUST MANIFOLD AND THREE WAY CATALYST

6.

Remove radiator. Refer to 

CO-40, "Component"

.

7.

Remove drive belts. Refer to 

EM-170, "Component"

.

8.

Remove air fuel ratio sensor 1 and heated oxygen sensor 2 as follows:

a.

Disconnect air fuel ratio sensor 1 and heated oxygen sensor 2 harness connectors.

b.

Remove air fuel ratio sensor 1 and heated oxygen sensor 2 on
both bank with heated oxygen sensor wrench (SST).

CAUTION:

• Be careful not to damage air fuel ratio sensor 1 and

heated oxygen sensor 2.

• Discard any air fuel ratio sensor 1 and heated oxygen sen-

sor 2 which have been dropped onto a hard surface such
as a concrete floor: replace with a new one.

9.

Remove exhaust mounting bracket between three way catalysts (right and left bank) and transmission.
Refer to 

EX-3, "Checking Exhaust System"

.

10. Disconnect A/C piping from A/C compressor, then remove A/C compressor with power tool. Refer to 

ATC-

121, "Component"

. 

11. Remove alternator and bracket. Refer to 

SC-19, "System Description"

.

12. Remove exhaust front tube with power tool. Refer to 

EX-3, "Checking Exhaust System"

.

13. Remove steering lower joint at power steering gear assembly side, and release steering lower shaft. Refer

to 

PS-17, "Removal and Installation"

.

14. Remove three way catalysts (right and left bank).

15. Remove exhaust manifold covers. (right and left bank)

PBIC2333E

PBIC2334E