Engine Coolant Temperature Sensor; Connector Wiring - Fiat Bravo Service Manual

Bravo- Brava 0
1998 range
INJECTION NTC
c
O
°C
-20 15970 40
-10 9620 50
0 5975 60
10 3816 70
20 2500 80
25 2044 90
30 1679 100
Copyright Fiat Auto
16v
NTC
INS1 •RUMENT
Q
a C
1150 80 300.8-313.2
807 90 226.3-234.1
172-177
576 100
110 132.9-136.1
418
120 103.6-106.6
309
231
176
ENGINE COOLANT
S E N S O R
This sensor is fitted on the thermostat.
It is made up of brass casing which affords
protection for the actual resistive elements
consisting of two NTC (Negative Temperature
Coefficient) type thermistors whose electrical
resistance decreases as the temperature in-
creases).
The two thermistors are separate and provide
information concerning the temperature to the
instrument panel (A) and the engine man-
agement control unit (B), respectively.
The reference voltage for the latter is 5 Volt:
since the control unit intake circuit is designed
as a voltage divider, the reference voltage is
shared between a resistance in the control unit
and the actual sensor.
As a result, the control unit is capable of
evaluating the variations in the sensor resis-
tance through the changes in voltage, thereby
obtaining information concerning the tem-
perature.
The table shows the progress of the sensor,
which can be measured by disconnecting the
connector and connecting an ohmmeter as il-
lustrated in the diagram.

Connector wiring

Engine
Fuel system
10.
T E M P E R A T U R E
25