Infiniti G37 Coupe. Manual - part 475

 

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Infiniti G37 Coupe. Manual - part 475

 

 

EVAPORATIVE EMISSION SYSTEM

EC-81

< FUNCTION DIAGNOSIS >

[VQ37VHR]

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NOTE:
Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.

System Description

INFOID:0000000001733953

INPUT/OUTPUT SIGNAL CHART

 : Vehicle front

1.

EVAP canister

2.

EVAP canister vent control valve

3.

EVAP control system pressure sen-
sor

 : To previous figure

JMBIA0847ZZ

EC-82

< FUNCTION DIAGNOSIS >

[VQ37VHR]

EVAPORATIVE EMISSION SYSTEM

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and
idling.

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

1

EVAP canister 
purge flow control

EVAP canister purge vol-
ume control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery

Battery voltage*

1

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

EVAP control system pressure sensor

Pressure in purge line

Unified meter and A/C amp.

Vehicle speed*

2

EVAPORATIVE EMISSION SYSTEM

EC-83

< FUNCTION DIAGNOSIS >

[VQ37VHR]

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Component Parts Location

INFOID:0000000001910708

1.

Battery current sensor

2.

IPDM E/R

3.

VVEL control module

4.

Cooling fan relay

5.

VVEL actuator motor relay

6.

Mass air flow sensor (with intake air 
temperature sensor) (bank 1)

7.

Refrigerant pressure sensor

8.

Camshaft position sensor (PHASE) 
(bank 1)

9.

Cooling fan motor-2

10. Intake valve timing control solenoid 

valve (bank 1)

11.

Cooling fan control module

12. Cooling fan motor-1

13. Intake valve timing control solenoid 

valve (bank 2)

14. Camshaft position sensor (PHASE) 

(bank 2)

15. Mass air flow sensor (with intake air 

temperature sensor) (bank 2)

16. ICC brake hold relay (ICC models)

17. Brake booster pressure sensor

18. Ignition coil (with power transistor) 

and spark plug (bank 2)

19. Electric throttle control actuator 

(bank 2)

20. A/F sensor 1 (bank 2)

21. Fuel injector (bank 2)

22. VVEL control shaft position sensor 

(bank 2)

23. VVEL actuator motor (bank 2)

24. Manifold absolute pressure (MAP) 

sensor

25. Engine coolant temperature sensor

26. Knock sensor

27. Fuel injector (bank 1)

28. VVEL actuator motor (bank 1)

29. EVAP canister purge volume control 

solenoid valve

30. VVEL control shaft position sensor 

(bank 1)

JMBIA0837ZZ

EC-84

< FUNCTION DIAGNOSIS >

[VQ37VHR]

EVAPORATIVE EMISSION SYSTEM

31. Ignition coil (with power transistor) 

and spark plug (bank 1)

32. EVAP service port

33. A/F sensor 1 (bank 1)

34. Crankshaft position sensor (POS)

35. Electric throttle control actuator 

(bank 1)

1.

Mass air flow sensor (with intake air 
temperature sensor) (bank 1)

2.

Mass air flow sensor (with intake air 
temperature sensor) (bank 2)

1.

Electric throttle control actuator 
(bank 1)

2.

Electric throttle control actuator 
(bank 2)

 : Vehicle front

1.

Cooling fan motor-2

2.

Cooling fan control module

3.

Cooling fan motor-1

4.

Cooling fan relay

JMBIA0838ZZ

JMBIA0839ZZ

JMBIA0840ZZ

 

 

 

 

 

 

 

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