RTH: ECU fully blown?? fuse 27.

[rbuljo]

Hi gurus..

I might have f..ked up my ecu, didnt use the car this winter, so now when i want to get it going again i cant get it started. (lot of moisture in the car though)

found out that it keeps blowing fuse no. 27 - Engine Timing I.

disconnected the ECU. no fuses blown.

pulled the ECU apart, couldnt find no obvious faults like corrosion etc.
pulled out my multimeter and got continuity between;

18 +12V battery feed, via Fuse S27.
and
14 Ground #2 (0V) - Inlet manifold
19 Ground #3 (0V)
24 Ground #4 (0V)
30 0V Reference Signal - F96 , G42 , G61 ,G62, G66, G69
48 Reference point for engine speed and crankshaft position sensors - G4 , G28

obviously it is shorted somewhere.. but anyone got any ideas what i should do???

[prj]

Yes, I know what to do.

You overvolted your ECU. Bad jump cable or batter charger?
There must be over 24V for this to happen.

[rbuljo]

ah damn.. I used a quite powerful battery charger with jump starter function to get her going(didnt happen obviously).. what can I do?

ps. sorry for the first post to be a question.. I`ve been tinkering around on this forum for 1year now.. huge compliments to you guys with so much knowledge of these cars..

[prj]

I don't have a 3B ECU here and I don't have schematic for 3B ECU, so I can't tell you directly what you need to replace.

If you send it here, I can fix it...
Or if you send hi-res pictures I can probably walk you through it.

PM me.

[rbuljo]

thanks for helping me out.. time is of the essence here so i dont have the time to ship it.

but got some electriconic education and taking a engineering degree now in electro technics. so if you say what to do I`m sure I could do it here.. sending you a pm with pics.

[UrS4boy]

Yes, I know what to do. You overvolted your ECU. Bad jump cable or batter charger? There must be over 24V for this to happen.

To confirm that (somewhat), there have been several cases over here in NAmerica that people have killed their UrS4/S6 ECUs while incorrectly getting a jump start. I have advocated for NOT using any jumper cables. Either charge the battery (I use the (+) and (-) posts under the hood (bonnet) (that we in NAmerica got, not sure about UK and Europe)) or swap in a newly charged battery, never jump start (just to be super safe).

Your mileage may vary.