Fiat Bravo Service Manual page 383

Engine
Fuel system
10.
Bravo '™i
20v
The graph below shows the sensor charac­
teristics which can be measured by discon­
necting the connector and connecting an
ohmmeter as shown in the diagram at the
side.
COOLANT TEMPERATURE SENSOR
(0.280.130.026)
The sensor is fitted near the thermostat cas­
ing with the sensitive part in contact with the
coolant. It is made up of a brass casing
which protects the actual resistive element
comprising an NTC (Negative Temperature
Coefficient) «thermistor», where the electrical
resistance of the sensor decreases as the tem­
perature increases).
It provides the control unit with a voltage
which varies according to the temperature of
the engine in order to correct the information
concerning the air flow rate from the flow
meter so that according to the signal received
by the sensor the control unit can control the
injection of the fuel for a greater length of
time, providing the necessary enrichment
when the engine is operating at temperatures
below operating temperature.
50000-
40000-
30000-
20000-
10000-
5000-
4000-
3000-
2000-
1000-
500-
400-
300-
200-
100-
50-
i
-4
\
0-3
\
0-2
\
\
0-10 0 20 40 60 80 100 120
OQ"~
Recovery
If air T < 19.9 °C, it is assumed that engine T
= air T for three minutes, then it is assumed
that engine T = 80 °C. If air T ^ 19.9 °C, it is
assumed that engine T = 80 °C immediately.
Additional provisions
Locking the self-adjustment of the mixture
strength and idling at current values.
Wiring connector
The numbers indicate the corresponding
control unit pins
: . ;
452
»
;o
32
Print no. 506.670