Fan Control - 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
Brake pedal switch
Voltage on pin K-14
Clutch pedal switch
Voltage on pin K-32

Fan control

The ECU operates the fan according to the coolant temperature:
temperature when first fan speed is switched on: 97°C
temperature when second fan speed is switched on: 102°C
The ECU runs the fan at first speed when the A/C system is on. If the coolant temperature signal is absent, the ECU
implements recovery mode by running the fan at second speed until the error is removed. The throttle is opened
before starting the fans to prevent drops of engine speed.
I
NPUT PARAMETERS
E
LECTRICAL QUANTITY
Engine temperature sensor
Voltage signal on pin A-22
Potentiometer signal on
throttle
Voltage to pins A-25 and A-10
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
C
ONTROLLER
L
OGIC
MED 7.6.1
The ECU implements
strategies with accelerator pedal
released, electrical loads on and
according to engine temperature.
C
ONTROLLER
L
OGIC
MED 7.6.1
According to engine temperature,
the ECU:
controls the first fan speed
controls the second fan
speed
increases idling speed
125/318
Fiat Auto S.p.A.
After Sales Training
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
Motorised throttle
idling Voltage to pins A-15
and A-30
Injectors
Voltage to pins:
A-50, A-49; A-47, A-48;
A-32, A-33; A-35, A-34
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
Motorised throttle
Voltage to pins A-15 and A-
Fan first speed relay
Voltage from pin K-89
Fan second speed relay
Voltage from pins K-70
© 2004 Fiat Auto S.p.A. - All rights reserved
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