900 SE Hatchback L4-1985cc 2.0L DOHC Turbo EFI (1997)
Transmission Temperature Sensor/Switch: Description and Operation
TRANSMISSION FLUID TEMPERATURE SENSOR
The transmission fluid temperature sensor, which is fitted in the transmission housing, gives the Transmission Control Module (TCM)
information about the current transmission fluid temperature.
The sensor is of the NTC type, i.e. the sensor's built-in resistance has a negative temperature dependence: the resistance is reduced when the
temperature rises. This property means that the voltage level varies on TCM input pin 33.
The variations in resistance and voltage are shown in the table below.
The sensor is grounded in ground point G34S, car body ground.
The TCM uses the temperature information to calculate gear shifting points and when to connect the lock-up function.
Oil temp
Resistance
Voltage, pin 33
°C
(Ohms) ±10%
(V) ±10%
-10
5000
4.6
0
2000
4.1
+20
900
3.4
+40
400
2.4
+80
125
1.1
+100
75
0.7
+150
27
0.3
