Infiniti G37 Coupe. Manual - part 613

AIR CLEANER AND AIR DUCT

EM-27

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Inspection

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INSPECTION AFTER REMOVAL

Inspect air duct and resonator assembly for crack or tear.
• If anything is found, replace air duct and resonator assembly

EM-28

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INTAKE MANIFOLD COLLECTOR

INTAKE MANIFOLD COLLECTOR

Exploded View

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Removal and Installation

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REMOVAL

WARNING:

Never drain engine coolant when the engine is hot to avoid the danger of being scalded.

1.

Remove engine cover with power tool. Refer to 

EM-24, "Exploded View"

.

2.

Remove air cleaner case and air duct (RH and LH). Refer to 

EM-26, "Exploded View"

.

3.

Remove electric throttle control actuator as follows:

a.

Drain engine coolant. When water hoses are disconnected, attach plug to prevent engine coolant leak-
age.

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1.

EVAP canister purge control solenoid 
valve

2.

Clamp

3.

EVAP hose

4.

EVAP hose

5.

Clamp

6.

Water hose

7.

Water hose

8.

Electric throttle control actuator (bank 1) 9.

Gasket

10. PCV hose

11.

Clamp

12. PCV hose

13. Intake manifold collector

14. Gasket

15. Water hose

16. Water hose

17. Electric throttle control actuator (bank 2) 18. EVAP hose

19.

Manifold absolute Pressure (MAP) sen-
sor

20. EVAP tube assembly

21. EVAP hose

A.

To vacuum pipe

B.

To brake booster

C.

To water outlet (rear)

D.

To PCV valve

E.

To heater pipe

Refer to 

GI-4, "Components"

 for symbols in the figure.

INTAKE MANIFOLD COLLECTOR

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CAUTION:

• Perform this step when engine is cold.
• Never spill engine coolant on drive belt.

b.

Disconnect water hoses from electric throttle control actuator. When engine coolant is not drained from
radiator, attach plug to water hoses to prevent engine coolant leakage.

c.

Disconnect harness connector.

d.

Loosen mounting bolts in reverse order as shown in the figure.
NOTE:
• When removing only intake manifold collector, move electric

throttle control actuator without disconnecting the water hose.

• The figure shows the electric throttle control actuator (bank 1)

viewed from the air duct side.

• Viewed from the air duct side, the order of loosening mounting

bolts of electric throttle control actuator (bank 2) is the same
as that of the electric throttle control actuator (bank 1).

CAUTION:

Handle carefully to avoid any shock to electric throttle con-
trol actuator.

4.

Disconnect vacuum hose, PCV hose and EVAP hose from intake manifold collector.

5.

Remove EVAP canister purge volume control solenoid valve and EVAP tube assembly from intake mani-
fold collector.

6.

Loosen mounting bolts and nuts with power tool in the reverse
order as shown in the figure to remove intake manifold collector.

INSTALLATION

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

INTAKE MANIFOLD COLLECTOR 

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

• Tighten mounting bolts and nuts in numerical order as shown in the

figure.

WATER HOSE

• Insert hose by 27 to 32 mm (1.06 to 1.26 in) from connector end.
• Clamp hose at location of 3 to 7 mm (0.12 to 0.28 in) from hose end.

ELECTRIC THROTTLE CONTROL ACTUATOR (BANK 1 AND BANK 2)

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: Engine front

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: 10.8 N·m (1.1 kg-m, 8 ft-lb)

: Engine front

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INTAKE MANIFOLD COLLECTOR

• Tighten in numerical order as shown in the figure.

NOTE:
• The figure shows the electric throttle control actuator (bank 1)

viewed from the air duct side.

• Viewed from the air duct side, the order of tightening mounting

bolts of electric throttle control actuator (bank 2) is the same as
that of the electric throttle control actuator (bank 1).

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

ness connector of electric throttle control actuator is disconnected.
Refer to 

EC-18, "THROTTLE VALVE CLOSED POSITION

LEARNING : Description"

.

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

Position Learning” when electric throttle control actuator is replaced. Refer to 

EC-19, "IDLE AIR VOLUME

LEARNING : Description"

 and 

EC-18, "THROTTLE VALVE CLOSED POSITION LEARNING : Description"

.

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