The oil temperature sensor signal
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
The value indicates the oil temperature sensor signal. Voltage decreases with increased sensor temperature.
Value on cold transmission: (+20°C) approximately 2.4 V.
Value on hot transmission: (+100°C) approximately 0.3-0.5 V.