Accelerator Pedal Fuel Cut-Off - Alfa Romeo 159 Training Material

ENGINE
I
NPUT PARAMETERS
E
LECTRICAL QUANTITY
Engine speed sensor
Frequency on pins A55
and A40
Accelerator potentiometer
signal
Voltage on pins K-60 and
K-82
Air flow meter
Voltage on pin A-12
Potentiometer signal on
throttle
Voltage to pins A-25 and
A-10

Accelerator pedal fuel cut-off

ECU functions include:
idling acknowledgement
rpm number over a certain threshold
It stops fuel injection according to:
engine speed
engine temperature
vehicle speed.
Dynamic decrease of engine speed is checked before reaching idling conditions.
Fuel injection is partially reactivated according to a logic for smoothly taking the engine speed to idling ratio.
Normal functions are reactivated when idling speed is reached.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
C
ONTROLLER
L
OGIC
MED 7.6.1
The ECU according to the
acceleration request, implements
torque control strategies and
according to emission containment
and engine performance:
controls the throttle
adapts injection time
controls variable timing
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Fiat Auto S.p.A.
After Sales Training
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
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
Variable timing solenoid
valves
Voltage to pins A-19
(exhaust) and A-04
(suction)
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