Infiniti EX35. Manual — part 583

EC-74

< FUNCTION DIAGNOSIS >

[VQ35HR]

EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION SYSTEM

System Diagram

INFOID:0000000003133272

System Description

INFOID:0000000003133273

INPUT/OUTPUT SIGNAL CHART

*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.

JMBIA1316GB

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

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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.

EVAPORATIVE EMISSION LINE DRAWING

PBIB1631E

JMBIA0052ZZ

EC-76

< FUNCTION DIAGNOSIS >

[VQ35HR]

EVAPORATIVE EMISSION SYSTEM

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

1.

Intake manifold collector

2.

EVAP canister purge volume control
solenoid valve

3.

EVAP service port

: From next figure

1.

EVAP canister

2.

EVAP canister vent control valve

3.

EVAP control system pressure sen-
sor

: Vehicle front

: To previous figure

JMBIA1186ZZ

EVAPORATIVE EMISSION SYSTEM

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Component Parts Location

INFOID:0000000003738636

1.

Battery current sensor

2.

IPDM E/R

3.

Cooling fan relay

4.

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

5.

Refrigerant pressure sensor

6.

Cooling fan motor-2

7.

Intake valve timing control solenoid
valve

8.

Exhaust valve timing control magnet
retarder

9.

Cooling fan control module

10. Cooling fan motor-1

11.

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

12. ICC brake hold relay (ICC models)

13. Ignition coil (with power transistor)

and spark plug (bank 2)

14. Electric throttle control actuator

(bank 2)

15. A/F sensor 1 (bank 2)

16. Fuel injector (bank 2)

17. Camshaft position sensor (PHASE)

18. Engine coolant temperature sensor

19. Knock sensor

20. Exhaust valve timing control position

sensor

21. EVAP canister purge volume control

solenoid valve

22. Fuel injector (bank 1)

23. Ignition coil (with power transistor)

and spark plug (bank 1)

24. EVAP service port

25. A/F sensor 1 (bank 1)

26. Crankshaft position sensor (POS)

27. Electric throttle control actuator

(bank 1)

JMBIA0002ZZ