Infiniti G37 Coupe. Manual — part 475
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EVAPORATIVE EMISSION SYSTEM
EC-81
< FUNCTION DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
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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
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EVAPORATIVE EMISSION SYSTEM
EC-83
< FUNCTION DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
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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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