My ECU fried???

[Mark_Liverpool]

Basically my car has always had a fault code on it "62 Ignition feedback signal", no one knew what th hell it meant, BMW or snap-on. As a recent post I've put up shows I had further ignition problems:

Ignition Problem with codes

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Hi, I've been looking all overt the net for information and I'm getting no where quick!

Basically I've got a 1993 RHD E36 320i Coupe running MS40 (Siemens) management it seems.

I drove the car to my friends, turned it off had no problems with running, no juddering, jumping, stalling anything, ran fine. Got into the car 5 minutes later and it just cranked over and would not start.

So the car cranks but will not start, I used a snap-on scanner and the following codes came up:

01 Ignition Cylinder 1
02 Ignition Cylinder 3
03 Ignition Cylinder 5
29 Ignition Cylinder 2
30 Ignition Cylinder 4
31 Ignition Cylinder 6
62 Feedback Ignition Signal
204 Feedback Ignition Signal

If anyone can shed any light on what the best route to take is I'd be extremely grateful.

Mark


So anyway, the water pump broke at the "same" time so i presumed the crank sensor had got water on/in it and broken. So I was removing that to test it, to which i found something "important?" this being the nature of my post.

Basically to all of the coils is a brown wire, that when back in the loom casing all bind together to one thick cable that is the earthed under the inlet manifold i presume, as it wasn't actually screwed down to anything. Presumably was slowly working loose as I did used to get random misfire moments that lasted random amounts of time, 2 seconds to the length of the journey. Now you ask why i didn't fix it then, well i presumed it was head gasket on way out as it was using water but no obvious loss, later to be found only when under pressure ie moving it was squeezing past the water pump bearing.

So I've put it all back together with new water pump/stat and re-earthed this wire to the engine hoist bolt on the front of the engine and guess what... It still won't start.

Again any help would be much appreciated, sorry for the essay but I just like to put people in the whole picture before asking a "could be anything" kinda question.

Mark

[v33_n0d3]

Eww.... nasty situation. Do the coils get any power?

[Mark_Liverpool]

How do I test for that? Voltmeter from one of the other two wires to earth?

Just took out the ECUs, one is a siemens 40.1 and the other one above it is a bosch , take it is is the siemens that is the main one? What is the other one for? Opened up the siemens one and nothing looked "burnt out" inside, couldn't get the bosch one open due to it using an 8 torx and my set oly goes down to 10 grrr!!!!

[v33_n0d3]

Yes, test it with a voltmeter. See if you get anything at the end of the coil. Sounds like it might be an ignition problem. I assume it turns but doesn't start, correct?

As for the torx bolts... use an allen wrench but be VERY gentle.

[Mark_Liverpool]

Cheers v33_n0d3, will give that a try. Read about some kind of water problem, ecus didn't seem to have had water on them as they'd surely be obviously water marked and aren't, just covered in dust. Also some DME relay it appears seems to give troubles, will have to put it all back together and try that!

[bobbobb]

when this happens always try ayour spare key the key can loose the code trust me this has happened to me

[SewerSideUp]

Good one on the key issue bobbobb !

I have a Snap-On scanner mate.
Give me sometime and I'll see what I can do for you !!!

It's gonna take sometime bcause I have 12-hour shifts till the 12th of September (G.I.T.E.X.).

Whenever I can get my hands on any info I'll be sure to post it !

Cheers and good luck !!

[Mark_Liverpool]

Nice one fella, looking forward to see if anyone can shed any light because BMW and Snap-on can't tell me what the 62 and 204 code actually means!!!! Hopefully upgrading to the Bosch bluetooth scanner system soon which looks ALOT more indepth and informative from the demo we had the other month so maybe that will help too.

Cheers for the info on the key too but mines before the days of coded keys apparently as I went to see if my alarm was aftermarket or genuine BMW at my local BMW dealer.

Mark