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Car Broke down! :/ after full revs Any help /advice?
To OP,
I 'll measure some ecu's to get the resistance values mentioned above. Obviously if yours is kaput its not much help, but it might help someone else out in the future!
If ECU is blowing fuse every time it's connected most likely the car has issues with the alternator and was overvolting the ECU.
The ECU IIRC at 18V collapses a diode and forces ground and power together, to prevent further damage to itself.
Measure the resistance on the ECU inputs between:
PIN 18 and PIN 24
PIN 27 and PIN 24
If you read 0 ohm on any of those, then your alternator's voltage regulator is shot, causing an overvoltage and the ECU frying the diode in itself.
The ECU then needs repair - the diode needs to be desoldered and replaced.
If you have resistance between those pins and they are not shorted together, then at least that part of the ECU is intact.
Ah thank you!! will note this, it has had a new alternator and it seems like a beast and aftermarket one
If ECU is blowing fuse every time it's connected most likely the car has issues with the alternator and was overvolting the ECU.
The ECU IIRC at 18V collapses a diode and forces ground and power together, to prevent further damage to itself.
Measure the resistance on the ECU inputs between:
PIN 18 and PIN 24
PIN 27 and PIN 24
If you read 0 ohm on any of those, then your alternator's voltage regulator is shot, causing an overvoltage and the ECU frying the diode in itself.
The ECU then needs repair - the diode needs to be desoldered and replaced.
If you have resistance between those pins and they are not shorted together, then at least that part of the ECU is intact.
Hey thx !! very informative! though does this information still apply if its only blowing when I turn on the ignition.. not when its just plugged in...
Has anyone ever taken the fusebox out? I've undone the nuts but its held down by some gummy material and a right bitch to get off.. its not budging! anyone any tips? or have I missed something?
How are you getting on with diagnosing the issues?
Just got back from the Nurburgring trip this weekend and sorting out my life. Havent got round to looking at the s2 yet, just getting my daily, the golf top mounts done, with new tyres and front aligment doing atm.. will jump back onto the s2 when I can.. Thats the update so far. will try my best at looking at this.
Ok guys!! heres an update!! I have checked the fuse box now and opened it, still no signs of issue,
I managed to strip the ecu very carefully and I found something. Is this easy to fix? (its the closeup picture of the 3 connectors and one isnt looking right).
Who would be able to do this work? ecu specialist? an electronics guru or even me?
looks like a resistor of transistor im not too sure , my electrical knowledge is vague.
That's a diode - easy enough to fix it yourself provided it's a through-PCB fixture. Just make sure you fit a new one with the bar on the right side - the bar represents the line at the end of the triangle on the diode symbol.
That's the overvoltage protection zener. Your voltage regulator is probably shot, it blows at 18V IIRC.
No idea why it's tilted to the side though. But maybe it got hot enough that it melted the solder.
If it is what I think it is then it is not a standard diode, in fact if you put a standard diode in you'll blow the ECU fuse all the time I think.
The ECU schematics are posted in the forum, easy to verify.
That's the overvoltage protection zener. Your voltage regulator is probably shot, it blows at 18V IIRC.
No idea why it's tilted to the side though. But maybe it got hot enough that it melted the solder.
If it is what I think it is then it is not a standard diode, in fact if you put a standard diode in you'll blow the ECU fuse all the time I think.
The ECU schematics are posted in the forum, easy to verify.
Huge thank you
hmmm.. I may send it off to an ecu specialist.
can you explain what a voltage regulator is? is that in the ecu?
I dont have much knowledge on these things thx
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