I am new here, looking for some advice. I am an enthusiastic hobby car mechanic, normally working on older cars and bikes. I own my C5 2007 2.0HDI (228'000km) since a few years and did already quite some repairs. I like the car, but sometimes the modern technique is over my know how.
These days I am having troubles with missing turbo pressure. Diagnosed with Lexia, P0243, open circuit to the pressure regulator (the magnetic valve).
- replaced the corresponding valve (behind cylinder bank) - no better
- disconnected and sprayed the electric connectors, shaked all the cables, - turbopressure back to normal (2.3 bar) for some days
- tested the function of the vacum operated turbo-regulator, the rod moves fine when vacum is applied
- when there is low turbo pressure, the air temp intake sensor shows -50°C (changed the sensor, no better)
- when there is low turbo pressure, the tempomat (automatic speed control) is not working, malfunction warning in the dashboard
- engine error light is allways off
I would like to find out, where that circuit is open, but I have no wiring diagrams. Tried to download dockbackup/sedre, but cannot get into any diagrams.
If somebody could send me a print of the engine mangement wiring diagram, would help me a lot! Or tell me where to start checking...
Looking forward to the advice of the more experienced French Car Lovers
Alain
