Yamae

Thanks for the detailed report, RickyGee. Your report will help others too.

Anyway, congratulations on your successes. It 's also a big success for you that your son became a master of two different degrees. He must have studied hard but without your assistances, he couldn't be that big, I can imagine easily. You really are a good father.

fsuguy

Hi,

If this is really LVC, then I owe you a double dose of thanks - once for the help and info with the ECU, and secondly for the many, many movies! I always knew we were in for a rollicking good time if you were featured!!! So, Thank You!

LScowboyLS

he's been dead 24 years, I'm his illegitimate son!

simrx3

hi guys,

capacitor fix done.. worked a treat so far..

feels like she has more power too..

dhhd

i have a 92 sc400 that has leaking caps. The car ran great all summer until I took it for a track day and at the end of the day, it wouldn't rev out past 4,000 RPMs. I want to assume I should order the 10 total caps that we are instructed to order for a 92 LS 400 however I really want to make sure I order the correct type and quantity. I also have a 95 LS that is running without any problems but I will be ordering the capacitors for it off of post #1. If anyone knows the correct amount and type for me 1992 SC400 I would greatly appreciate it.
Thanks for all the information posted thus far and for the information I hope to receive!!

Yamae

Did you read the post #436?

SC93

++++++++++++++++++++++++++++++++++++++

as Yamae recommended, order as cowboy suggested below for me '93sc400.

3 of 10uF
2 of 15uF
3 of 47uF
2 of 100uF
1 of 220uF

i rebuilt my ecu last month using above caps from digi-key. u will have a couple spares but
to be safe go with above. my total cost was barely $10 including shipping.

btw.. been a month since i replaced caps and car is running beautifully

dhhd

Yes Yamae I actually sat down and read it from page 1 to the end and I saw the post in #436 howevee it does not indicate the model year or ECU number so I was not able to verify that I should order those particular ones or not. But I will now if you are saying that those are the ones a 1992 model year takes. My ecu number for the 92 sc400 is 89661-24230 40pin 40pin 40pin
Thanks
SC93, thanks for also helping out and verifying the correct ones to get.

silos5

iTrader: (3)

here is my story.

problem: transmission jerks from 1st to 2nd gear, and kinda slips from 2nd to 3rd.
solution: changed capasitors on the ECU (11 pieces total).
car: LS400 1998 UCF20 (european model, coz I´m in europe).
result: problem solved !!!!!!!!!!!
costs: quite a lot, because of the shipping costs, but its worth it !!

NB! Old capasitors didnt show any sigh of leaking or anything, they looked like new, but obviously didnt do their work good any more.

Special thanks goes to LScowboyLS for helping me with the capacitors ... and Yamae for sharing usefull information !!

LScowboyLS

yes, please use the list I provided to SC93 that he posted - make sure to use the recommended capacitors off of my links in post #1 or the repair will not work.

python

iTrader: (4)

Clint was the man

Yamae

Congratulations on your success, silos.
Thanks for the detailed report from North East Europe.

Your report will tell something very important to owners who own UCF20/21 of model year 1998 or after. Those models were still in use of Nichicon PF(M) and PR(M) capacitors that containing "quaternaty ammonium salt " and are quite risky to use many years.

One of the important points is that it was rather a AT related symptom than the engine.
This is another example of the failing ECUs for UCF20 related to AT to me. One more important point is that the problem has happened at the cooler climate place there in Estonia, Europe.

Denso and Toyota redesigned the ECU for the VVTi engine of 1UZ-FE, using newer processors that consume less energy and this reduced the loads for the DC-DC converter in the ECU.

Also newer ceramic capacitors were used there in parallel with the Nichicon capacitors. These do not stress electrolytic capacitors used at the DC-DC converter compared with former generations. Thus, models after 98 have less opportunity to have failed electrolytic capacitors. But those are still Nichicon PF(M) and PR(M) capacitors and you'd better not to think safe.

It has been 16 years since 98 models (manufactured after July 1997) were shipped, those Nichicon capacitors are also aged and it is natural to fail these days. Most of users and mechanics consider that the problem may be caused by the aged mechanical parts inside of the AT but the fact is not always so. The overhaul of an AT is not a simple and easy job but replacing capacitors is easy and the cost is much less. My Celsior is a 98 and I already have replaced the Nichicon capacitors 2 years ago and I will not be messed up my AT unit by an AT technician.

simrx3

ok caps used that were recomeded..

still getting sticking speedo and tacho.. thoughts?

LScowboyLS

sounds like in your case it is mechanical sticking (original lubricant becoming gummy) - search here on Club Lexus for the speedometer sticking threads to see how to do mechanical sticking fix.

silos5

iTrader: (3)

LS400 1998 UCF20 european version.
I had the transmission problem since I have bought the car 4 years ago.
As I said earlier, I have changed capacitors and the problem got solved.
Yesterday I checked the old capacitors, and only one had visual defects. I´m not a specialist, but check out the 3 bubbles on the top.