Oil temperature sensor

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Oil Temperature Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The temperature sensor is an NTC sensor. The temperature sensor is on the gearbox control system inside the side cover. It gauges the temperature of the gearbox fluid in the sump. The temperature sensor is integrated in the cable harness. The temperature sensor is supplied with 5 V and is grounded via the transmission control module (TCM). The control module can determine the gearbox fluid temperature by measuring the voltage drop above the NTC resistance of the sensor. The control module stores the time the temperature has been within a certain temperature range. If a certain temperature and time has been exceeded, a diagnostic trouble code (DTC) indicating that a oil change is necessary is stored.

There are diagnostics for the temperature sensor.