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ECU repair http://www.gt4dc.co.uk/forum/viewtopic.php?f=2&t=5617 |
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Author: | Nibbles [ Wed May 16, 2012 8:32 pm ] |
Post subject: | ECU repair |
Since I've now seen the following failure on 2 ECU's (1st was a CS, 2nd an RC) I thought I'd post up the details so that others can consider repairing if they have a rare version. The failure in both cases is a 10uF/50V capacitor which appears to be local decoupling on the flyback diodes for the idle solenoid. Not sure why it's failed, maybe just a slightly weak batch. It has also corroded away a track on the PCB which appears to be linking G- (dizzy trigger common) and a few other components to the main ground. I suspect this is what caused the symptoms. Symptoms in the first case were intermittant cutting out / non start which would clear after a time. Symptoms in the second case, for a few weeks the ECU light had been coming on & off at random but no stored codes. It then refused to start when warm, but once started (after several hours off) would keep running. The failed component, with it's innards leaked out over the surrounding area. Step 1 - remove the component. Melt the legs with a soldering iron and pull out. Don't try sucking the solder first then pulling out cold. It's a plated through board and the legs tend to stay soldered in the middle so you then pull out the through plating when you pull the component. Step 2 - Clean the mess off the board using solvent & a stiff brush. Step 3 - Check continuity of all affected tracks and bridge and broken / suspect ones with wire. Step 4 - Clear the component holes with a solder sucker, then a quick squirt of protective laquer. (I use HPA as it's moisture repellant). I do this before fitting the new component as it would mask the spray from the area underneath. Step 5 - Refit the new component (10uF/50V), bridge another suspect track on the other side and another spray of laquer. on both sides. |
Author: | Diceman [ Wed May 16, 2012 9:51 pm ] |
Post subject: | |
hmm, worthwhile carrying out some preventative maintenance by the looks of it. I wonder what temp it gets to inside the ECU case, unusual for a cap to fail like that at what probably amounts to 5000 hours ish? |
Author: | Nibbles [ Thu May 17, 2012 11:24 am ] |
Post subject: | |
ight be worthwhile for a few more people to have a peek in their ECU's. The symptoms we experienced are not consistent with failure of the capacitor itself and more likely failure of the surrounding track(s) once corroded, or possibly any conductivity of the goo expelled between tracks/components. I suspect there may be several ecu's with the capacitor failed but not ahowing any symptoms as yet. |
Author: | Nibbles [ Sun Jun 16, 2013 6:59 pm ] |
Post subject: | Re: ECU repair |
Just to update this thread, I've now seen 3 ecu's that have 'died' and been repaired - 2xCS and 1xRC. Plus I also looked at a spare RC ECU which had one capacitor leaking but hadn't actually 'failed' or even seen any symptoms. Also, there is a capacitor of the same value on the small top board which has also failed on 2 of the above ECU's, and definaely causing the failure on one of them. edit note - adding some pictures making clear which capacitors have been showing problems on each board. https://www.dropbox.com/s/9yevt51ntu7ec ... 5.jpg?dl=0 https://www.dropbox.com/s/9pp06prj4u5wn ... 5.JPG?dl=0 |
Author: | niblettr [ Mon Jun 17, 2013 8:34 pm ] |
Post subject: | Re: ECU repair |
Add 2 st205 blitz ecus (the toyota pcb had the failed cap) to that list. |
Author: | squarepants [ Wed Jun 19, 2013 9:55 pm ] |
Post subject: | Re: ECU repair |
Hi Nibbles, Do you offer a repair? I know you kindly looked at Jeffs ecu for him and I potentially (from the symptoms described - hot start issue) have the same problem. My ecu is a rev 1 Mines p&P Would be good to know there's an avenue if needed. Cheers |
Author: | Nibbles [ Thu Jun 20, 2013 11:44 am ] |
Post subject: | Re: ECU repair |
I'm happy to have a look and sort out any leaking capacitors but I have no means of testing a rev 1. |
Author: | squarepants [ Sun Jun 23, 2013 3:05 pm ] |
Post subject: | Re: ECU repair |
ok bud that's good to know. I'll test it for you Will be in touch if needs be |
Author: | jeff [ Wed Jun 26, 2013 9:58 am ] |
Post subject: | Re: ECU repair |
I hope it is OK to link this post over to OC as Adam (woosh) is investigating similar problems http://www.gt4oc.net/forums/viewtopic.p ... 2#p1402942 |
Author: | Nibbles [ Wed Jun 26, 2013 6:24 pm ] |
Post subject: | Re: ECU repair |
Post away, but I can't read it tell him to contact me if he wants. He can get my number off Phil. |
Author: | jeff [ Wed Jun 26, 2013 6:35 pm ] |
Post subject: | Re: ECU repair |
Will do. Ta Chris. Check out myitshot on OC? yellowhot now... and he has had 4 birthdays in the last week 2, 100, 69 and now 21... getting to be like the old days again.... so sad so sick 'shrug' |
Author: | Nibbles [ Wed Jun 26, 2013 7:12 pm ] |
Post subject: | Re: ECU repair |
yellowhot ? I'm completely lost |
Author: | NoGT4 [ Wed Jun 26, 2013 7:31 pm ] |
Post subject: | Re: ECU repair |
Chris............ myitshot of the OC has had a yellow card (warning) for some reason? His user name has changed to yellowhot, and he keeps changing his birthday in his profile, so he pops up on "todays birthdays" on the forum with different ages. Jeff............ Chris is not on the OC. Anyway, I think Woosh can sort his ECU, but if not, I am sure he will be in touch |
Author: | Nibbles [ Wed Jun 26, 2013 7:43 pm ] |
Post subject: | Re: ECU repair |
so - mental age, real age, wishful thinking, shoe size |
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