All my crazy Lexus issues SOLVED!! (ECU-leaking capacitor)
#451
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I ordered two sets of caps to repair two bad ECU for my 94 LS400 , one ECU was perfectly working fine and the other still would not pass 2000 rpm. Recheck all joint and trace they all seem good, any suggestion what could be wrong? Thanks in advance.
#452
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
it is possible for an ECU to have a defective transistor or resistor or other component, even a bad microprocessor - since Nippon Denso has never, and will never release the electrical schematic diagram to these ECU's to anyone, not even the dealership, there are some ECU's that can never be repaired!
#453
Moderator
![](https://www.clublexus.com/forums/images/ranks/rank-mod2.gif)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
it is possible for an ECU to have a defective transistor or resistor or other component, even a bad microprocessor - since Nippon Denso has never, and will never release the electrical schematic diagram to these ECU's to anyone, not even the dealership, there are some ECU's that can never be repaired!
But there is a way to fix that using a used processor picking up from another ECU which was not repaired due to the too much leaked liquid and the traces were badly damaged. But this requires equipments and skills. It is beyond the job of a Sunday mechanic. Even professional technicians can't do that easily.
Come to think of it, no dealers fix the ECU replacing capacitors or other components. They just replace the ECU and charge you some big money. Only some people here do the capacitor job spending only 10 dollars + the shipping cost.
#457
Driver School Candidate
Join Date: Sep 2013
Location: FL
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I am so happy to report that changing my transmission filter and fluid worked! I love my car ![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
Thank you again, Cowboy! If you're ever in the Sarasota area, let me know, I'd love to give you a huge hug!
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
Thank you again, Cowboy! If you're ever in the Sarasota area, let me know, I'd love to give you a huge hug!
Last edited by CAD; 09-19-13 at 09:04 PM.
#458
Lexus Champion
Thread Starter
#460
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
No. the LS hasn't had a bad year since it was introduced in 1990 until 2007 when it suffered a serious deep internal engine issue. (valve recall) - this was straightened out with the 2009 model! ![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
The LS has always been one of the world's most reliable cars, and with a fit and finish that is the envy of other automakers, and no vehicle made has a more durable engine, transmission, or A/C system (the three most expensive areas of the car)
I would buy a 1998 in a heartbeat if it was well maintained by the previous owner, always garage kept, and no accident history
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
The LS has always been one of the world's most reliable cars, and with a fit and finish that is the envy of other automakers, and no vehicle made has a more durable engine, transmission, or A/C system (the three most expensive areas of the car)
I would buy a 1998 in a heartbeat if it was well maintained by the previous owner, always garage kept, and no accident history
![Thumb Up](https://www.clublexus.com/forums/images/smilies/thumbsup.gif)
Last edited by LScowboyLS; 09-20-13 at 10:56 AM.
#461
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I was just wondering my 94 Previa may have same brown caps in 94 LS400. It turns out they are blue color caps with no sign of corrosion and leakage like brand new condition. All brown color cap need attention by now.
#462
Lexus Champion
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Your Previa capacitors are 20 years old, and therefore likely worn out, regardless of brand or color. I see people all the time who wait until they leak, then they have to buy a junkyard ECU, and then have that ECU recapped, because their ECU has electrolyte damage, which once it begins, eats up your ECU very fast!
![EEK!](https://www.clublexus.com/forums/images/smilies/eek1.gif)
#463
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Good point. I think it is a nice advice to owner who is driving older car like 15 plus year old should have a good working ECU in storage just in case. Never know when you need one. Go to junk yard and find a good working one for insurance. 50-60 bucks is the best insurance you can get for your LS.
#464
Driver School Candidate
Join Date: Oct 2008
Location: florida
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
LSCowboyLS, or Yamae,
I would appreciate some of your expert help with changing the caps in my ECU; I opened up my ECU ('92LS400, p/n 89661-50032 or 175000-4111) and can identify only 9 caps; three appear to be the 47mf, 2 are 10mf, 1 is the 220mf, 1 is 100mf and then there are two by what appears to be Marcon(???) that do not have any capacitance values on the can, but show a voltage rating of 35v with temp. at 105c. These two caps are by themselves on the board that lifts up.
My question is do you have any idea of why there are only 9 caps? the box and boards do not appear to be tampered with, and no indication of leakage on the boards! Also, do you thinkt these two caps by themselves are the 15mf ones?
Thanks for any help and insight you can offer.
I would appreciate some of your expert help with changing the caps in my ECU; I opened up my ECU ('92LS400, p/n 89661-50032 or 175000-4111) and can identify only 9 caps; three appear to be the 47mf, 2 are 10mf, 1 is the 220mf, 1 is 100mf and then there are two by what appears to be Marcon(???) that do not have any capacitance values on the can, but show a voltage rating of 35v with temp. at 105c. These two caps are by themselves on the board that lifts up.
My question is do you have any idea of why there are only 9 caps? the box and boards do not appear to be tampered with, and no indication of leakage on the boards! Also, do you thinkt these two caps by themselves are the 15mf ones?
Thanks for any help and insight you can offer.