Nissan Pathfinder (2012 year). Manual - part 245

ENGINE CONTROL SYSTEM

EC-41

< SYSTEM DESCRIPTION >

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Engine Control Component Parts Location

INFOID:0000000007357957

BBIA0536E

August 2012

2012 Pathfinder

EC-42

< SYSTEM DESCRIPTION >

[VQ40DE]

ENGINE CONTROL SYSTEM

BBIA0578E

August 2012

2012 Pathfinder

ENGINE CONTROL SYSTEM

EC-43

< SYSTEM DESCRIPTION >

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1.

EVAP canister purge volume control 
solenoid valve (view with engine 
cover removed)

2.

EVAP service port 

3.

Oil filler cap

4.

Fuel filler pipe (top of frame view)

5.

EVAP control system pressure sen-
sor

6.

EVAP canister vent control valve

7.

EVAP canister

8.

Drain filter

9.

Power steering pressure sensor

10. Throttle valve (view with intake air 

duct removed)

11. Electric throttle control actuator

12. Intake manifold collector

13. Intake valve timing control solenoid 

valve (bank 1) 

14. Intake valve timing control solenoid 

valve (bank 2) (view with engine cov-
er and intake air duct removed)

15. Cooling fan motor harness connec-

tor (view with battery removed)

16. Fuel pump, fuel level sensor unit and 

fuel filter

17. Fuel pressure regulator

: Front

AWBIA0135ZZ

August 2012

2012 Pathfinder

EC-44

< SYSTEM DESCRIPTION >

[VQ40DE]

ENGINE CONTROL SYSTEM

PBIB2530E

August 2012

2012 Pathfinder

ENGINE CONTROL SYSTEM

EC-45

< SYSTEM DESCRIPTION >

[VQ40DE]

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BBIA0577E

August 2012

2012 Pathfinder

EC-46

< SYSTEM DESCRIPTION >

[VQ40DE]

ENGINE CONTROL SYSTEM

PBIB2646E

August 2012

2012 Pathfinder

ENGINE CONTROL SYSTEM

EC-47

< SYSTEM DESCRIPTION >

[VQ40DE]

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D

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BBIA0581E

August 2012

2012 Pathfinder

EC-48

< SYSTEM DESCRIPTION >

[VQ40DE]

MULTIPORT FUEL INJECTION SYSTEM

MULTIPORT FUEL INJECTION SYSTEM

System Description

INFOID:0000000007357958

INPUT/OUTPUT SIGNAL CHART

*1: This sensor is not used to control the engine system under normal conditions.
*2: This signal is sent to the ECM via the CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.

SYSTEM DESCRIPTION

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of

time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the

ECM memory. The program value is preset by engine operating conditions. These conditions are determined

by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air

flow sensor.

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various operat-

ing conditions as listed below.

<Fuel increase>

• During warm-up

• When starting the engine

• During acceleration

• Hot-engine operation

• When selector lever is changed from N to D

• High-load, high-speed operation

<Fuel decrease>

• During deceleration

• During high engine speed operation

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed*

3

Piston position

Fuel injection 
& mixture ratio 
control

Fuel injector

Camshaft position sensor (PHASE)

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

TCM

Gear position

Knock sensor

Engine knocking condition

Battery

Battery voltage*

3

Power steering pressure sensor

Power steering operation

Heated oxygen sensor 2*

1

Density of oxygen in exhaust gas

Air conditioner switch

Air conditioner operation*

2

Wheel sensor

Vehicle speed*

2

August 2012

2012 Pathfinder