9-3 (9440) V6-2.8L Turbo (2008)
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Transmission Temperature Sensor/Switch: Description and Operation
Gearbox Oil Temperature Sensor, AF 40 (535)
Gearbox Oil Temperature Sensor, AF 40 (535)
Location
The temperature sensor is mounted in the gearbox valve housing.
Main use
To inform the control module if the current temperature. The value is used to correct the PWM ratio to the solenoids so that the gear changes are not
affected by the viscosity of the oil. It is also used to activate the special gear change program in case of overheating.
Type
The sensor comprises an NTC resistor built into a plastic casing. The NTC resistor characteristics mean the resistance drops as the temperature rises.
Activation
The NTC resistor is supplied with 5 V through a pull up from control module pin 8 and is grounded through pin 7.
