MECU power supply
WARNING: This page is about a different car, the 2006 Volvo S80 and 2005 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
The value indicates the voltage over the Central Electronic Module (CEM).
The control module transmits the signal on the controller area network (CAN) and the Differential Electronic Module (DEM) uses the signal to diagnose the power supply.
Measurement range: 0 - 63.75 V
Normal range: 12.0 - 14.5 V