Climate Control System Connection; Cylinder Position Acknowledgment - Alfa Romeo 159 Training Material

ENGINE

Climate control system connection

The compressor draws engine power when the climate control system is started.
When idling, the ECU adapts the air flow to the new power request with the advantage for ensuring optimal drivability.
The ECU cuts out the compressor:
over 6500 rpm
over a certain engine coolant temperature threshold (117°C)
when cranking.
O
PERATING CONDITIONS
E
LECTRICAL QUANTITY
Engine speed sensor
Frequency on pins A55
and A40
HVAC on request signal
Signal on pin K-11
Engine temperature
sensor
Voltage signal on pin A-
22

Cylinder position acknowledgment

The ECU acknowledges which cylinder is firing at each engine revolution: it controls the injection and ignition
sequence of the cylinder in a sequential and timed fashion.
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
C
ONTROLLER
L
OGIC
MED 7.6.1
The ECU controls the climate
control compressor as follows:
- switching the compressor
on/off when the respective
button is pressed;
- switching the compressor off
temporarily (approximately 6
seconds) during sudden
acceleration, when maximum
engine power is required, or
when the engine is overheating.
122/318
Fiat Auto S.p.A.
After Sales Training
O
UTPUT PARAMETERS
E
LECTRICAL QUANTITY
Motorised throttle
Voltage to pins A-15 and A-
30
Compressor relay
Voltage control to pin K-12
© 2004 Fiat Auto S.p.A. - All rights reserved