Content .. 302 303 304 305 ..

Nissan Pathfinder (2012 year). Manual - part 304

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-513

< SYSTEM DESCRIPTION >

[VK56DE]

When the RESUME/ACCELERATE switch is pressed after canceling operation other than pressing MAIN

switch, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet

following conditions.

• Brake pedal is released

• A/T selector lever position is other than P and N

• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)

Component Description

INFOID:0000000007358430

ASCD STEERING SWITCH

Refer to

EC-873, "Component Description"

ASCD BRAKE SWITCH

Refer to

EC-877, "Component Description"

STOP LAMP SWITCH

Refer to

EC-882, "Description"

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to

EC-888, "Description"

ASCD INDICATOR

Refer to

EC-920, "Component Description"

August 2012

2012 Pathfinder

EC-514

< SYSTEM DESCRIPTION >

[VK56DE]

CAN COMMUNICATION

CAN COMMUNICATION

System Description

INFOID:0000000007358431

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

Refer to

LAN-53, "CAN Communication Signal Chart"

, about CAN communication for detail.

August 2012

2012 Pathfinder

COOLING FAN CONTROL

EC-515

< SYSTEM DESCRIPTION >

[VK56DE]

COOLING FAN CONTROL

Description

INFOID:0000000007358432

SYSTEM DESCRIPTION

Cooling Fan Control

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM via the CAN communication line.

The ECM controls the cooling fan speed corresponding to the vehicle speed, engine coolant temperature,

refrigerant pressure and air conditioner ON signal. The control system has a 3-step control [HIGH/LOW/OFF].

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.

Sensor

Input Signal to ECM

ECM function

Actuator

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

Engine speed*

Cooling fan
control

IPDM E/R
(Cooling fan relays)

Battery

Battery voltage*

Unified meter control unit

Vehicle speed*

Engine coolant temperature sensor

Engine coolant temperature

Air conditioner switch

Air conditioner ON signal*

Refrigerant pressure sensor

Refrigerant pressure

JMBIA0700GB

Cooling fan speed

Cooling fan relay

Stop (OFF)

OFF

Low (LOW)

OFF

High (HI)

August 2012

2012 Pathfinder

EC-516

< SYSTEM DESCRIPTION >

[VK56DE]

EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION SYSTEM

Description

INFOID:0000000007358433

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.

PBIB3639E

August 2012

2012 Pathfinder

EVAPORATIVE EMISSION SYSTEM

EC-517

< SYSTEM DESCRIPTION >

[VK56DE]

EVAPORATIVE EMISSION LINE DRAWING

PBIB2053E

August 2012

2012 Pathfinder

EC-518

< SYSTEM DESCRIPTION >

[VK56DE]

EVAPORATIVE EMISSION SYSTEM

EVAP vapor purge line

EVAP control system pressure sen-
sor

EVAP canister vent control valve

EVAP canister

Drain filter

Fuel filler pipe

: Vehicle front

: Previous figure

ALBIA0366ZZ

August 2012

2012 Pathfinder

INTAKE VALVE TIMING CONTROL

EC-519

< SYSTEM DESCRIPTION >

[VK56DE]

INTAKE VALVE TIMING CONTROL

Description

INFOID:0000000007358434

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 (IVT) control sole-

noid 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)
Camshaft position sensor (PHASE)

Engine speed

Intake valve
timing control

Intake valve timing control
solenoid valve

Intake valve timing control position sensor

Intake valve timing signal

Engine coolant temperature sensor

Engine coolant temperature

Unified meter control unit

Vehicle speed*

PBIB3276E

August 2012

2012 Pathfinder

EC-520

< SYSTEM DESCRIPTION >

[VK56DE]

FUEL FILLER CAP WARNING SYSTEM

FUEL FILLER CAP WARNING SYSTEM

System Diagram

INFOID:0000000007358435

System Description

INFOID:0000000007358436

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

JSBIA0797GB

Unit

Output signal

Actuator

ECM

Fuel filler cap warning display signal

Combination meter

August 2012

2012 Pathfinder

Content .. 302 303 304 305 ..