S5 TII-I realize an OMP malfunction can take the ECU down, but can the reverse occur? Can a bad ECU damage a sensor or component that's functioning properly?

I've never heard of a related problem, but as I have 6 370 ECU's, 4 of which are known good as I have tested them in my car, I have 2 that are questionable and as I would like to do an install and test, thus the question.

TIA

 

I posted a picture below of an ECU with burned outputs. I have a 'spare' N353 that is burned *exactly* like this from my bad MOP experiences. You could open the cases on those questionable ECU's and visually inspect. If they are burned, a competant solderer can fix it by replacing the parts. When you open the case on a burned ECU, you will probably *smell* the burn stink. Some people have sent their burned ECU to Pocketlogger and had an RTEK chip replacement. The ECU will then work (rtek version 1.X) or will work as long as the MOP is turned off (rtek version 2.x).

We know that the MOP can take out out the ECU MOP driver circuits. It does this when an internal short causes the MOP resistance to be much lower than it should be. The higher current that subsequently flows overheats the circuits on the ECU output circuits and burns them up.

Consider the opposite: The ECU MOP output circuits are burned up. They don't work, presumably at all. How can the MOP be damaged when the ECU isn't putting out current?

NOW get to the real issue on this thread: You have 6-N370 ECU's. That is 4 more than you need. Send one to me. I would even take one with burned outputs.

Done!

-Jack

 

[QUOTE=jackhild59;11087023]
We know that the MOP can take out out the ECU MOP driver circuits. It does this when an internal short causes the MOP resistance to be much lower than it should be. The higher current that subsequently flows overheats the circuits on the ECU output circuits and burns them up.

Consider the opposite: The ECU MOP output circuits are burned up. They don't work, presumably at all. How can the MOP be damaged when the ECU isn't putting out current?

NOW get to the real issue on this thread: You have 6-N370 ECU's. That is 4 more than you need. Send one to me. I would even take one with burned outputs.
-Jack

Thanks for the reply and if I find any to be bad, you can have the units, but as parts are difficult to come by, over the years I've become a parts hoarder with S5 TII items. Never seem to need any, but have many in the garage and pole shed.

I used the MOP just as an example to indicate how the ECU can be damaged when a component fails, but was concerned if the reversal could occur to any component if a bad ECU were to be installed in a vehicle, not just the MOP circuit.

Some have been in the garage for probably 20 years, so not certain as to the smell test, but guess it would have been easier to ask, are there any circuits in the ECU that when a problem occurs within the ECU a ripple effect can be seen and the corresponding sensor/component can be damaged?

BTW-Great A/C threads.

 

Jack, if someone wanted to repair that kind of damage, what sort of replacement parts would they need?
Thanks

 

o.O that is good info! i've been looking for something different to do to my ECU besides the Haltech ( which I can't afford) and reading this makes me want to start pre-mixing and blocking off the MOP on my 91 n/a. Thumbs up for the post!