Nissan Pathfinder (2012 year). Manual - part 247

EVAPORATIVE EMISSION SYSTEM

EC-57

< SYSTEM DESCRIPTION >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

EVAPORATIVE EMISSION SYSTEM

Description

INFOID:0000000007357966

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.

PBIB3639E

August 2012

2012 Pathfinder

EC-58

< SYSTEM DESCRIPTION >

[VQ40DE]

EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION LINE DRAWING

PBIB2528E

August 2012

2012 Pathfinder

EVAPORATIVE EMISSION SYSTEM

EC-59

< SYSTEM DESCRIPTION >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1.

EVAP vapor purge line

2.

EVAP control system pressure sen-
sor

3.

EVAP canister vent control valve

4.

EVAP canister

5.

Drain filter

6.

Fuel filler pipe

:Vehicle front

:Previous page

ALBIA0366ZZ

August 2012

2012 Pathfinder

EC-60

< SYSTEM DESCRIPTION >

[VQ40DE]

INTAKE VALVE TIMING CONTROL

INTAKE VALVE TIMING CONTROL

Description

INFOID:0000000007357967

SYSTEM DESCRIPTION

*: This signal is sent to the ECM via the CAN communication line

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake

valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant

temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid

valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to

increase engine torque in low/mid speed range and output in high-speed range.

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed and piston position

Intake valve 
timing control

Intake valve timing control 
solenoid valve

Camshaft position sensor (PHASE)

Engine coolant temperature sensor

Engine coolant temperature

Wheel sensor

Vehicle speed*

PBIB3279E

August 2012

2012 Pathfinder

FUEL FILLER CAP WARNING SYSTEM

EC-61

< SYSTEM DESCRIPTION >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

FUEL FILLER CAP WARNING SYSTEM

System Diagram

INFOID:0000000007357968

System Description

INFOID:0000000007357969

INPUT/OUTPUT SIGNAL CHART

Input

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

Output

*: This signal is sent to the combination meter via the CAN communication line.

SYSTEM DESCRIPTION

The fuel filler cap warning system alerts the driver to the prevention of the fuel filler being left uncapped and

malfunction occurrences after refueling, by turning ON the fuel filler cap warning display on the combination

meter.

ECM judges a refueled state, based on a fuel level signal transmitted from the combination meter.

When a very small leak is detected through the EVAP leak diagnosis performed after judging the refueled

state, ECM transmits a fuel filler cap warning display signal (request for display ON) to the combination meter

via CAN communication. 

When receiving the signal, the combination meter turns ON the fuel filler cap warning display.

CAUTION:

Check fuel filler cap installation condition when the fuel filler cap warning display turns ON.

Reset Operation

The fuel filler cap warning lamp tunes OFF, according to any condition listed below:

• Reset operation is performed by operating the meter control switch on the combination meter.

- When the reset operation is performed, the combination meter transmits a fuel filler cap warning reset signal

to ECM via CAN communication. ECM transmits a fuel filler cap warning display signal (request for display

OFF) to the combination meter via CAN communication. When receiving the signal, the combination meter

turns OFF the fuel filler cap warning display.

• EVAP leak diagnosis result is normal.

• Fuel refilled.

Unit/Sensor

Input signal to ECM

ECM function

EVAP control system pressure sensor

Pressure in purge line

Fuel filler cap warning control

Combination meter

Fuel level

Fuel filler cap warning reset signal

*

JSBIA0954GB

Unit

Output signal

Actuator

ECM

Fuel filler cap warning display signal

*

Combination meter

August 2012

2012 Pathfinder

EC-62

< SYSTEM DESCRIPTION >

[VQ40DE]

FUEL FILLER CAP WARNING SYSTEM

• DTC erased by using CONSULT.

NOTE:

MIL turns ON if a malfunction is detected in leak diagnosis results again at the trip after the fuel filler cap warn-

ing display turns ON/OFF.

August 2012

2012 Pathfinder

VARIABLE INDUCTION AIR SYSTEM

EC-63

< SYSTEM DESCRIPTION >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

VARIABLE INDUCTION AIR SYSTEM

Description

INFOID:0000000007357970

SYSTEM DESCRIPTION

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

When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid

valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes

the power valve.

Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-

sage B. This long intake manifold provides increased amount of intake air, which results in improved suction

efficiency and higher torque.

When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid

valve and the power valve is opened.

Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-

ened intake manifold length results in enhanced engine output due to reduced suction resistance under high

speeds.

COMPONENT DESCRIPTION

Power Valve

Sensor

Input Signal to ECM

ECM function

Actuator

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

Engine speed*

VIAS control

VIAS control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

PBIB1822E

August 2012

2012 Pathfinder

EC-64

< SYSTEM DESCRIPTION >

[VQ40DE]

VARIABLE INDUCTION AIR SYSTEM

The power valve is installed in intake manifold collector and used to

control the suction passage of the variable induction air control sys-

tem. It is set in the fully closed or fully opened position by the power

valve actuator operated by the vacuum stored in the surge tank. The

vacuum in the surge tank is controlled by the VIAS control solenoid

valve.

VIAS Control Solenoid Valve

The VIAS control solenoid valve cuts the intake manifold vacuum

signal for power valve control. It responds to ON/OFF signals from

the ECM. When the solenoid is off, the vacuum signal from the

intake manifold is cut. When the ECM sends an ON signal the coil

pulls the plunger downward and feeds the vacuum signal to the

power valve actuator.

BBIA0569E

BBIA0569E

August 2012

2012 Pathfinder