Nissan Pathfinder (2012 year). Manual — part 245
ENGINE CONTROL SYSTEM
EC-41
< SYSTEM DESCRIPTION >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
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