To the vehicle: Volvo 850 2,3 T5 166KW BJ. 04/1994 Petrol/LPG Body Moin people, I don’t know anymore, my 850 ran always without problems and one evening I turned off the car on the yard and in the morning started the theater then, engine turns, but does not start. I then tested: spark plugs, ignition cables, ignition distributors and runners, everything unobtrusive, sparks at the spark plug and at the ignition coil checked, no spark! So short hand bought a new ignition coil and built in, unfortunately still everything dead. Instead of blindly replacing further parts I then checked the usual suspicious and on the cam wave sensor the voltages. On the plus line 1.68V, signal line 0V and mass (against +) 12V. So the engine control unit was released and the line from the control unit to the Nock wave sensor was tested, 0Ohm resistance. Then I have to check the voltage supply of the engine control unit with a 100W lamp. Terminal 15 could only be measured with the multimeter, so that the voltage broke and the same thing was connected to the control unit.