Alfa Romeo 159 Training Material page 168

ENGINE
Intake control according to climate control system
The ECU controls the A/C compressor as follows by:
switching the compressor on/off when the respective button is pressed;
switching the compressor off temporarily (approximately 6 seconds) during sudden acceleration or when
maximum engine power is required.
I
NPUT PARAMETERS
E
LECTRICAL QUANTITY
Engine speed sensor
Frequency to pins A12 - A27
Accelerator pedal sensor
Voltage to pins:
B-9 and B-31
Coolant temperature sensor
Voltage between pins:
A-41 and A-58
Fuel pump control
Regardless of engine speed, the ECU:
powers the auxiliary fuel pump at key-on;
cuts off auxiliary pump power if the engine is not cranked up within a few seconds.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
C
ONTROLLER
L
OGIC
EDC-16C39
The ECU controls the A/C compressor as
follows by:
switching the compressor on/off
when the respective button is
pressed;
switching the
temporarily (approximately
seconds) during
acceleration or when maximum
engine power is required.
168/318
Compressor cranking enable
compressor off
6
sudden
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Fiat Auto S.p.A.
After Sales Training
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
Voltage to pin B-29