Sudden dead MS3

[skibby]

Hey,

i have build an new engine for my '88 G40 Polo and tuned it to fully sequntial. The Engine runs for 3 min absolutly perfect. After that the Tunerstudio going offline, the eingine has turned off by the MS and the 20A Fuse from the Coils blown.

After that the MS3 don't worked. I checked the Board Assembly guide, The Voltage on the 40 PIN Socket are korrekt. When i put in die MS3 Daugther, the Voltage break completly down. The 5V on the Proto Area is down to 0V and also the Voltage with the 40PIN Socket when the daughter Board put in.

Can i Checked something on the MS3 Daughter Board? I din't find any assembling Guide für MS3 daugther board or X Board.
The MS1 Chip works with the Mainboard.

The Coils are the Standard Coils with 3 Pins from VW. I Think there is the Fault with the Configuration COP.

Greets

[DaveEFI]

I don't think you'll find a schematic for the MS3 card. If there is 5v with it unplugged, but 0v with it plugged in, sounds likely it is faulty.

[skibby]

Yes without MS3 daughter-Board, the proto area has 5V. There is an Bluettoth Modul with Power LED. With no CPU / MS1 CPU it has power, with Ms3 Card no power.

Edit:
At the beginng (without defects) the complete MS3 with X Board / Realtime Clock an internal Knock used 0,70A. Now the Board + MS3 daughter Board need 1,1A and after 25 sec. it falls down to 0,25A. I Can't see any damage on the MS3 Board too. Nothing will hot.

It is possible that some components on the Mainboard not used by the MS1 und when the MS3 plugged in, that the Voltage is not provided?? Like Transistors?

[DaveEFI]

I can't really think of any components that aren't shared with all the processors that fit the V3 board. But I'd certainly check the board for shorts etc on the various in/outs. The idle stepper motor driver for example doesn't exist on the MS1 chip. So I'd check those tracks for shorts, etc.
The schematics in the manuals do give the connections to the MS3 processor board - just not a schematic of it.

There are specialists who will repair an MS2 daughter board, for less than the cost of a new one. Not sure if the same applies to the MS3.

[jsmcortina]

There are specialists who will repair an MS2 daughter board, for less than the cost of a new one. Not sure if the same applies to the MS3.

Yes.

James

[skibby]

I had hoped that maybe someone had a similar problem and could give me hints, which is possibly defective. But I think I do not come around the MS to send.

Is there a good address in Germany or Europe?

[racingmini_mtl]

Try removing the Bluetooth module (if it's powered by the 5V source on the MS board). That could be a bigger current drain than what the voltage regulator can handle.

Jean

[skibby]

Try removing the Bluetooth module (if it's powered by the 5V source on the MS board). That could be a bigger current drain than what the voltage regulator can handle.

Jean

Done, but the same Problem.

[DaveEFI]

I had hoped that maybe someone had a similar problem and could give me hints, which is possibly defective. But I think I do not come around the MS to send.

Is there a good address in Germany or Europe?

Contact jsmcortina who has posted to this thread. He is in the UK and can fix pretty well anything.

[skibby]

I had hoped that maybe someone had a similar problem and could give me hints, which is possibly defective. But I think I do not come around the MS to send.

Is there a good address in Germany or Europe?

Contact jsmcortina who has posted to this thread. He is in the UK and can fix pretty well anything.

This was my Idea at 10:00 clock ;)

[Myrrhstang]

I had a similar issue (excessive current draw). I'm guessing the reason you're seeing a drop in current after a few seconds is because of the internal current limiting protection circuitry in the regulator chip.

My problem(s) turned out to be on the V3.0 mainboard, not the MS3 daughtercard! To isolate the issue, try removing the MS3 daughtercard, and plugging it into a "protoboard". Give it +5V and ground on the appropriate pins, and then connect it to your PC with the appropriate USB cable. TunerStudio should be able to "see" it, if the daughtercard is functioning...