Nissan Altima L32. Instruction — part 376
EVAPORATIVE EMISSION SYSTEM
EC-625
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
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.
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
1
EVAP canister
purge flow control
EVAP canister purge vol-
ume control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Battery
Battery voltage*
1
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
Fuel temperature in fuel tank
EVAP control system pressure sensor
Pressure in purge line
Combination meter
Vehicle speed*
2
EC-626
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
EVAPORATIVE EMISSION SYSTEM
Component Parts Location
INFOID:0000000004349627
1.
Intake valve timing control solenoid
valve
2.
Ignition coil (with power transistor)
and spark plug
3.
Knock sensor,
Crankshaft position sensor (POS)
4.
Air fuel ratio (A/F) sensor 1
5.
Camshaft position sensor (PHASE)
6.
Engine coolant temperature sensor
7.
Park/neutral position (PNP) switch
8.
ECM
9.
Refrigerant pressure sensor
10. Battery current sensor
11. IPDM E/R
12. Mass air flow sensor (with intake
temperature sensor)
13. EVAP service port
14. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
15. EVAP canister purge volume control
solenoid valve
16. Fuel injector
17. Power steering pressure sensor
ALBIA0094ZZ
EVAPORATIVE EMISSION SYSTEM
EC-627
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Battery
2.
Fuel pump fuse (15A)
3.
IPDM E/R
4.
Brake master cylinder
5.
Engine ground
6.
Air cleaner assembly
7.
Mass air flow sensor (with intake air
temperature sensor)
8.
Radiator hose (upper)
9.
Engine coolant temperature sensor
10. Intake air duct
11. Camshaft position sensor (PHASE)
12. Tie rod (RH)
13. Power steering pressure sensor
14. Knock sensor
15. Engine oil cooler
16. Crankshaft position sensor (POS)
17. Drive shaft (RH)
: Vehicle front
ALBIA0091ZZ
EC-628
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
EVAPORATIVE EMISSION SYSTEM
BBIA0296E
1.
Exhaust manifold cover
2.
Air fuel ratio (A/F) sensor 1
3.
Heated oxygen sensor 2
(This illustration is a view from under
vehicle.)
4.
Engine oil pan
: Vehicle front
ALBIA0068ZZ
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