I recently got my Engine running. Today I did some further wiring and wanted to do a first testdrive. Got the engine running once again, but when I wanted to do a second start the Engine did not fire up.
I secured the ECU (DTA E48) with a 15A fuse which I found burnt through. I exchanged the fuse, but the ECU doesn't even connect to the PC anymore. Could also be a wiring problem. Is there any possibility to check the ECU?

That doesn't sound too good. My albeit Omex ECU has a 2amp fuse, not 15! If the ECU won't even talk to the laptop it may be severely goosed. I would open it up to look for signs of cooking inside because I'm a fiddler but better still send it back to DTA for a health check.
Edit.
DTA list the supply fuse at 20amp so that's not the fault. What else does the fuse supply?
Coils, pumps? Must have been quite a surge to blow it.

[Edited on 7/8/11 by Dusty]

Have you got an ignition spark/s and fuel ?

Have you checked to see if you have 12 volts reaching the ECU to power it up now you have replaced the fuse ?

When you carried out the additional wiring did you do it with the battery disconnected ?

How have you Earthed the ECU ?

The fuse does only supply 12V for the ECU.
12V does reach the ECU. I earthed it like DTA requires it, via two pins.
Batterie was disonnected while I was working.

So now the fuse isn't blowing and you now have 12 volts reaching the ECU ?

Does the fuel pump prime and do you have sparks at the plugs ?



Hopefully the connection issue between the Laptop and the ECU *might* just be a Communication issue

quote:

---

Originally posted by perksy
So now the fuse isn't blowing and you now have 12 volts reaching the ECU ?

---

quote:

---

Originally posted by perksy

Does the fuel pump prime and do you have sparks at the plugs ?

---

quote:

---

Originally posted by perksy
Hopefully the connection issue between the Laptop and the ECU *might* just be a Communication issue

---

I think I found the problem...
Hopefully I can fix it and nothing else is damaged.

if your talking about the transistor/ic's i dont think that is your problem. some have insulators some have to be grounded. looking at it i would say that is a regulator which should be grounded so it wouldn't explain why it wasn't coming on. although if its blown then it may be pulling so much current that its popping the fuses. personally i would be checking the power circuits before driver sections. do you have a schematic, it shouldn't be too difficult to fix if it is a blown cap/resistor/diode/transistor/regulator.

if you dont have the schematic then you will need to write down the numbers off all the components then look up the data sheets online, once you have the data you will need to desolder the suspected part and test to see if it is faulty using the data sheet. its pretty simple if you have done electronics before but really daunting if you have no previous experience.


personally i would disconnect all the wires to the ecu other than the 12v and ground and try and power it up as 99.999% of the time it will be the external loom not the guts of the beast.

[Edited on 10/8/2011 by ashg]

doh i just saw the broken leg. easy fix that.

[Edited on 10/8/2011 by ashg]

just looked it up for you http://www.datasheetcatalog.org/datasheets/70/69768_DS.pdf looks like its the 12v input supply regulator

I fixed the leg but it is still not working, I think I have to change the regulator itself. Are there any alternatives around as that this specific type is hard to find?