Temperature Sensor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.
The temperature sensor in the coupling unit is mounted close to the control valve in the housing for the control module. The sensor is immersed in the hydraulic fluid. The sensor measures the temperature of the hydraulic fluid and transmits a signal to the differential electronic module. The differential electronic module uses the temperature signal to adapt the system when the temperature, and therefore the viscosity, of the fluid changes.
If the temperature of the fluid exceeds 100 °C there is no pressure in the coupling and all wheel drive is disengaged. When the temperature falls below 100 °C the coupling is pressurized again.
All wheel drive is disengaged if there is a fault in the temperature sensor.