Fuel Vapour Recovery - Alfa Romeo 159 Training Material

ENGINE
I
NPUT PARAMETERS
E
LECTRICAL QUANTITY
Brake pedal switch
Voltage on pin K-14
Clutch pedal switch
Voltage on pin K-32
Engine speed sensor
Frequency on pins A55
and A40
Speedometer signal
Signal from ECU ABS to
pins B-61 and B-62
Engine temperature
sensor
Voltage signal on pin A-
22
Accelerator potentiometer
signal
Voltage on pins K-60 and
K-82

Fuel vapour recovery

The polluting fuel vapours are collected in an activated carbon canister and are sent to the intake manifold to be
burnt.
The occurs by means of a solenoid valve controlled by the ECU which alternates open stages (canister wash-out)
and closed stages (fuel factor learning stage).
When opened, the solenoid valve opening duty cycle is controlled by the ECU to eliminate fuel vapours without
changing engine carburetion.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
C
ONTROLLER
L
OGIC
MED 7.6.1
The ECU processes the signals
received from the various
sensors and determines the fuel
cut-off strategy by controlling:
•
controlling the pressure
regulator
•
controlling injectors
•
advance.
119/318
Fiat Auto S.p.A.
After Sales Training
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
Pressure regulator
Control voltage on pin: A-20
Injectors
Voltage to pins:
A-50, A-49; A-47, A-48;
A-32, A-33; A-35, A-34
Motorised throttle
Voltage to pins A-15 and A-
30
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