EHC issues and 2nd intro

[Shane2jz]

Hi, although this is going to show me as a new member posting for the first time, in fact I joined a few years ago, but its so long since I logged in, I have since left the job I was in and dont have access to that email address to retrieve my account. Had a few e53s now, all diesel and all manual.

So, on to my latest problem with my current X5 that has me a bit baffled. its a 2004 6sp manual diesel, M57 with Air on the rear, shocks on the front. I started getting the "Self levelling Susp inactive" message and by using INPA discovered that the RH rear sensor was not providing a meaningful output, INPA reported it was about 3.3v and didnt vary with conditions, Left hand side was fine. Fault code logged was something along the lines of no valid info within the prescribed time period. I replaced this sensor, probably foolishly, with a cheap ebay unit. This produced no output at all and I got the 0V error for the right side with an instant fault code generated, unlike the original sensor that took a short while after clearing to re-appear.

I bought a Febi sensor and this time it all looked great, could move the sensor arm and see the output vary on INPA, great I think, chucked it back together, cleared the codes, went for a drive with lap top hooked up and all looked great.....until I switched off the engine and bong, there it is, the 0v message back. Start the engine and I can see the output and working correct, clear the code, go for a drive and its fine right up until I back the key off when the code appears and the car starts to jack up to max, as it does when its inactive. Now, what's odd, when I back the key off, the left hand sensor still provides a meaningful output, however the new RH sensor drops to zero immediately the engine stops and the code is generated. I have pulled the EHC module and checked for dry joints, made sure the plug/socket looks ok. Do I have another rubbish sensor maybe. Anyone know what should be on what pin of the sensors? I have a scope and the ability to delve deeper if someone can point me to the sensor pin outs. Sorry for the long post, just trying to get as much info over as possible. Thanks in advance. Shane