pcmhacking.net

Searching all over and can’t see anybody who has done it.

Have a E40 that I want to track back the map sensor signal back to the Processor.

Has anybody successfully managed to open it up and actually get to the top of the board?

I know the huge ram issues too. The one I’m trying to disassemble is one that has a ram issue, but I want to see if I can’t find the circuit for the Maps sensor signal for another I have here.

I am very interested to know how you will get to the top of the board also, as I have a number of different GM PCMs and ECMs that I need to do this without making it totally unusable, for research purposes. I am hoping someone responds with a good answer.

This is E41, and different. But it gives some ideas about what you might be up against. I think those E40 pins look soldered, I was thinking you might a way to properly desolder them, but maybe its possible to do like in the video and desolder them one by one and pluck each pin out. Then heat and scrape whatever else you find. It might get you a reasonably in-tact board, but is probably not so good for later re-assembly. https://www.youtube.com/watch?v=orksRsHU0Bc

Maybe you'd need to desolder the large heavily soldered locations in the corners too, depending if thats just a large component or wire on the back side, or an actual connection to the case.

Someone on here put an E92 into a milling machine and just cut away the entire case. All that was left was the bare PCB, the 3 connectors on top, and a little bit of aluminum surrounding the connectors. It's a pretty drastic option and not really DIY, but it might ultimately be the safest way to go if you want to keep it functional.

I have done both cutting a case up and desoldering.

If you have patience, the desoldering path ends up much cleaner but can take a good few hours depending on soldering skill level. (Lots of flux and desoldering braid).

The cutting path can be faster if you take your time.
You can cut off the front plugs completely and then desolder any mounting lugs on the back side, then the case should just pull straight off.

Appreciate all the replies so far, The ecu still works, but seems to have a faulty map sensor circuitry, but tests fine on a scope right up to the Ecu pin, So it has to be internal or at the CPU, so for this i wont cut up or attempt to gain access to the top, Might just need to order a replacement and reprogram it to suit.

Would have been nice if it was as simple as an 0411, But i knew it wouldn't be the case... I do have a spare E40 here for the test bench, But also dont really want to bugger that either...