After disassembling and reassembling the cylinder head of a 2011 Citroën Berlingo, the engine would not run anymore, producing camshaft related errors. Using an automotive diagnostic oscilloscope, the cause of the problem was found.
The relative compression test in Multi Channel oscilloscope software is briefly explained, with instructions on how to perform a relative compression test with just a lab scope and current clamp.
Lab scope measurement of a turbo charge pressure regulation system on a car during acceleration. The signals from the turbo charge pressure regulation system are shown and can be downloaded. To help determining whether the turbo charge pressure regulation system is functioning correctly, different deviations from the example signals are mentioned along with possible causes.