Nissan Pathfinder (2008 year). Manual — part 298
ENGINE CONTROL SYSTEM
EC-501
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Engine Control Component Parts Location
INFOID:0000000001537603
1.
ECM
2.
Battery current sensor
3.
Refrigerant pressure sensor
4.
Power steering pressure sensor
5.
Intake valve timing control solenoid
valve (bank 2)
6.
Cooling fan motor
7.
Intake valve timing control position
sensor (bank 2)
8.
Engine coolant temperature sensor
9.
Electric throttle control actuator
10. Intake valve timing control position
sensor (bank 1)
11.
Intake valve timing control solenoid
valve (bank 1)
12. Camshaft position sensor (PHASE)
13. Mass air flow sensor (with intake air
temperature sensor)
14. A/F sensor 1 (bank 1)
15. Ignition coil (with power transistor)
and spark plug (bank 1)
16. EVAP service port
17. Fuel injector (bank 1)
18. Knock sensor (bank 1)
19. EVAP canister purge volume control
solenoid valve
20. Knock sensor (bank 2)
21. Fuel injector (bank 2)
22. Ignition coil (with power transistor)
and spark plug (bank 2)
23. A/F sensor 1 (bank 2)
24. IPDM E/R
ALBIA0352ZZ
EC-502
< FUNCTION DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM
1.
Body ground (view with air cleaner
case removed)
2.
Body ground (view with battery re-
moved)
3.
No.1 ignition coil
4.
Engine ground
5.
Mass air flow sensor (with intake air
temperature sensor)
6.
IPDM E/R
7.
Battery
8.
Radiator hose
9.
Camshaft position sensor (PHASE)
AWBIA0081ZZ
ENGINE CONTROL SYSTEM
EC-503
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
10. Electric throttle control actuator
(view with intake air duct removed)
11.
Electronic throttle control actuator
harness connector (view with intake
air duct removed)
12. Cooling fan motor harness connec-
tor
: Vehicle front
AWBIA0082ZZ
EC-504
< FUNCTION DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM
1.
EVAP canister purge volume control
solenoid valve (view with engine
cover removed)
2.
EVAP service port
3.
Crankshaft position sensor (POS)
(view from under vehicle)
4.
Engine oil pan
5.
Condenser-1
6.
Brake fluid reservoir
7.
Fuel filler pipe (top of frame view)
8.
EVAP control system pressure sen-
sor
9.
EVAP canister vent control valve
10. EVAP canister
11.
Drain filter
12. Refrigerant pressure sensor
13. Intake valve timing control position
sensor (bank 2) (view with engine
cover and intake air duct removed)
14. Intake valve timing control position
sensor (bank 1)
15. Intake valve timing control solenoid
valve (bank 2) (view with engine cov-
er and intake air duct removed)
16. Drive belt
17. Radiator hose (view with engine cov-
er and intake air duct removed)
18
Intake valve timing control solenoid
valve (bank 1)
: Vehicle front
ALBIA0369ZZ
1.
Knock sensor (bank 1) (view with en-
gine removed)
2.
Knock sensor (bank 2) (view with en-
gine removed)
3.
Battery current sensor
4.
Power steering pressure sensor
5.
Intake manifold
6.
Engine coolant temperature sensor
ENGINE CONTROL SYSTEM
EC-505
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
7.
Ignition coil (with power transistor)
(bank2)
8.
Ignition coil (with power transistor)
(bank 1)
9.
Fuel injector harness connectors
(bank 2)
10. Fuel injector harness connectors
(bank 1)
: Vehicle front
PBIB2710E
1.
A/F sensor 1 (bank 2)
2.
A/F sensor 1(bank 1)
3.
Heated oxygen sensor 2
(bank 1)
4.
Heated oxygen sensor 2
(bank 2)
: Vehicle front
AWBIA0083ZZ
EC-506
< FUNCTION DIAGNOSIS >
[VK56DE]
ENGINE CONTROL SYSTEM
1.
ASCD steering switch
2.
MAIN switch
3.
CANCEL switch
4.
SET/COAST switch
5.
RESUME/ACCELERATE switch
6.
ECM harness connectors (view with
ECM cover removed)
7.
Coolant reservoir
8.
Accelerator pedal position sensor
9.
Fuel level sensor unit and fuel pump
harness connector (view with fuel
tank removed)
AWBIA0084ZZ
ENGINE CONTROL SYSTEM
EC-507
< FUNCTION DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
10. Fuel pump, fuel level sensor unit and
fuel filter
11.
Fuel pressure regulator
12. ASCD brake switch
13. Stop lamp switch
14. Brake pedal
EC-508
< FUNCTION DIAGNOSIS >
[VK56DE]
MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM
System Description
INFOID:0000000001537604
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system. This is used only for the on board diagnosis.
*2: This signal is sent to the ECM through 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
Park/neutral position (PNP) switch
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
ABS actuator and electric unit (control unit)
VDC/TCS operation command*
2
Air conditioner switch
Air conditioner operation*
2
Wheel sensor
Vehicle speed*
2
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