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1996 1KZ-TE Prado engine cut-out on open road-ECU

lovelongtime

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Oct 23, 2021
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aaland
I thought I would post something on one of these Prado sites I use so often for diagnosing/fixing problems.
I was driving the other day and the engine cut out, everything shut down including power steering and coasted to a stop, all warning lights on as happened when you stall.
Got towed to a carpark and tried to restart the thong for about 2 hours, thought it might have been fuel block or something. Turned over fine but just wouldn't start, had a really good battery luckily. Than after a very long time it started for a few seconds and then dies. This gave me hope and I fiddled with all the possible electrical connections as well. After maybe another 30 minutes it fired again, drove forward backwards, stopped and wouldn't start again. Played around with everything I could think of in engine bay and under steering wheel, all accessible wiring. Didn't start. Mate turned up to tow it and as he pulled in it started and actually kept running to my surprise. Replaced fuel filter and cleaned out a few sensors, but as it was now starting and running it was impossible to pinpoint anything. Got a bit bored today and decided to take out the ECU, a very easy job as it is just behind the glovebox (about 6 screws to remove). Opened it up, thanks to another thread I had come across about ECU's with leaking capacitors causing all sorts of strange problems. Low and behold there it was 2 x leaking capacitors. Have sent away to be repaired to a guy in Taupo who quoted $100-$400 depending on damage. Pretty sure this was the problem and sharing in the hope it might help someone else as this seems to be very hard to pinpoint. No test error codes etc etc.
 

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Welcome to the forum!! Thanks for sharing. So the ECU has been repaired and the problem is definitely solved?
 
Thats a rare one so thank you for sharing it might save somebody lots of time and headaches :thumbup:
 
I have sent it for repair so will report back. These ECU problems sound like they create intermittent problems, so hard to trace and thus difficult to fix I guess. If it goes for a few months without stopping I would count it as fixed.
 
Graysworld on here had the same problem a short while ago, fixed with his ecu repair of leaking capacitors too.
 
Makes me want to crack mine open and see what it's like. Maybe replace the capacitors as a precaution.
 
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Those blue with grey top tantalum caps are notorious in hifi applications and I replace them along with all electrolytics each time I have a unit in for service. The Nichicon are good quality but at 30 years of age they are at end of life.
Fingers crossed that is all it needs
 
Yep, Graeme/graysworld had his repaired, it then failed again, had it repaired and got rid.
Details on here somewhere in a 70's thread.
 
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