Ignition system
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.
A check for cylinder leakage (also called "leak down") can be carried out instead of a compression test. Cylinder leakage test
CAUTION:
The ignition system operates at high ignition charges and produces dangerous voltages in both the low and high voltage circuits.
There is dangerous voltage throughout the entire ignition system including connectors etc.