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P4F31 DJ01
Engine
Fuel system
ioT
AIR TEMPERATURE SENSOR
On this version, the intake air temperature
sensor is separate from the air flowmeter; it is
an ordinary NTC (Negative Temperature Co-
efficient) sensor, whose electrical resistance
decreases as temperature increases.
As the input circuit into the control unit is de-
signed as a voltage divider, this voltage is di-
vided between a resistor present in the con-
trol unit and the sensor's NTC resistor. The
control unit can therefore assess the changes
in the sensor's resistance from the changes in
voltage, and thus obtain the temperature in-
formation.
COOLANT TEMPERATURE SENSOR
B1 B2
A
P4F07LJ01
The sensor consists of a brass casing which
houses the actual resistive elements, which
are two NTC (Negative Temperature Coeffi-
cient) thermistors; the electrical resistance of
the sensor decreases as the temperature in-
creases.
The two NTC thermistors are separate, and
they supply the temperature information to
the specific gauge on the instrument panel
and the fuel injection-ignition control unit.
For the NTC element relating to the fuel in-
jection, the reference voltage is 5 Volt; as the
input circuit into the control unit is designed
as a voltage divider, this voltage is divided
between a resistor present in the control unit
and the sensor's NTC resistor. The control
unit can therefore assess the changes in re-
sistance of the sensor through the changes in
temperature.
INJECTION NTC
GAUGE NTC
c
Q
-20
15970
-10
9620
0
5975
10
3816
20
2500
25
2044
30
1679
C
Q
40
1150
50
807
60
576
70
418
80
309
90
231
100
176
°C
Q
60
90
120
512-602
184-208
76-88
1. NTC for fuel injection
2. NTC for instrument panel gauge
The tables opposite give the resistance values
which the NTC elements can assume in ac-
cordance with the coolant temperature.
Copyright Fiat Auto
7
Содержание 1998 Marea Weekend
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