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All my crazy Lexus issues SOLVED!! (ECU-leaking capacitor)

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Old 10-05-12, 12:37 PM   #31
LScowboyLS
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some of the caps for 90-94 will be the same, and some won't, not certain but I think 90-94 has 7 or 8 caps total in the ECU

since you have to take out the lower glovebox anyway, why not take it out now and open the ECU and post which caps are in there for everyone else to see.

I would not do the dash and the ECU at the same time, unless you have a back up vehicle.

once you have identified the caps, you can throw the ECU back in the car in about 5 minutes and it will be drivable until the caps you order arrive, you will just have to do without the lower glovebox for a few days
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Last edited by LScowboyLS; 10-18-12 at 08:13 AM..
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Old 10-05-12, 03:34 PM   #32
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I guess i can since ill be leaving for Fl for a week so it can sit. ill update maybe tonight


EDIT: tomorrow afternoon/evening

Last edited by 53bel; 10-05-12 at 03:48 PM..
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Old 10-06-12, 03:25 PM   #33
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as Promised its a total of 8 hopes this helps out some of you

C104
10mf 50V 105oC
C106
220mf 16V 105oC
C108
100mf 10V 105oC
C103
10mf 50V 105oC
C832
15mf 35V 105oC
C831
15mf 35V 105oC
C740
47mf 63V 105oC

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

And i found my issue one if you look at this picture below Next too C104

Click the image to open in full size.
Now these two look conspicious too me marked on them are numbers
R783
.43 OHMs K
Click the image to open in full size.

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Old 10-07-12, 12:44 PM   #34
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quick question could i use the types of caps for the dash fix for the ecu issues? or do they got to be the ones from over in japan?
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Old 10-07-12, 07:13 PM   #35
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Hey guys, i dont own an LS but do you think that this could also be the issue for a 93 GS?
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Old 10-07-12, 07:15 PM   #36
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To answer your question, I need to know what type of capacitors you use for the dash fix.
For the ECU, only low ESR and 105 ℃ type capacitors should be used otherwise you will be encountering another problem in the future.
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Old 10-07-12, 07:38 PM   #37
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Quote:
Originally Posted by GhostGS View Post
Hey guys, i dont own an LS but do you think that this could also be the issue for a 93 GS?
Toyota has widely used Nichicon type PF(M) and PR(M) capacitors that contain the infamouse liquid “quaternaty ammonium salt" starting late 80s as far as I know. I don't know the USM of the 93 GS but the possibility is very high. I suggest you to check inside of the ECU and inform us the result please.

There are many other Toyota models that are showing the ECU problems. Things are all written in Japanese but you can at least see model names seeing below.
http://blogs.yahoo.co.jp/itakame3/60725107.html

He wrote,"やはりトヨタのECUが多い。でも、トヨタのECUはコンデンサーの液漏れが多いので、判断がしやすい。" In English, "Failed Toyota's ECUs are many. But it is easy to judge since the liquid is leaking from the capaitors."
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Old 10-07-12, 09:32 PM   #38
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Quote:
Hey guys, i dont own an LS but do you think that this could also be the issue for a 93 GS?
Most DEFINITELY
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Old 10-07-12, 09:35 PM   #39
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Quote:
quick question could i use the types of caps for the dash fix for the ecu issues? or do they got to be the ones from over in japan?
Japanese caps are best, but the main thing is that the ones you use are LOW ESR type.

as this is a bit of a project, why not use the best caps available? - your ECU is VERY important to the way the car drives, and even the world's best caps are dirt cheap!

Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.


also, you see those grayish-white cables flat ribbon cables in your pics? - be CAREFUL with those, they will not tolerate any rough handling and you will create a lot more work for yourself if one becomes partially separated from it's respected mainboard!

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Old 10-07-12, 09:43 PM   #40
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Quote:
as Promised its a total of 8 hopes this helps out some of you
you only listed 7 caps

PS - I think the resistors at R783 are likely fine.
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Old 10-08-12, 05:37 AM   #41
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my bad the 8th one is
i ordered all of them but it was multiple places so i amazon ordered all of them one payment

C105
100mf 10V 105c
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Old 10-08-12, 07:19 AM   #42
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so here is the consolidated caps list for 90-94

1990-92 LS400 needs 10 caps as follows:

Qty. 3 of 10μF - 50v
Qty. 2 of 15μF - 35v
Qty. 3 of 47μF - 63v
Qty. 1 of 100μF - 10v
Qty. 1 of 220μF - 16v


1993-94 LS400 needs 8 caps as follows:

Qty. 2 of 10μF - 50v
Qty. 2 of 15μF - 35v
Qty. 1 of 47μF - 63v
Qty. 2 of 100μF - 10v
Qty. 1 of 220μF - 16v

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Old 10-08-12, 10:37 AM   #43
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thanks for summin it up for me my brain was hurting haha anyways ill let everyone know how well it goes on my own page so i dont flood this one anymore. maybe some of these can be stickied for each generation by all means use the pics.

Since today is holiday i had to get a temp bankcard yesterday and is supposedly not activated so i got to wait to order once card is fixed it would not take me much to open the ecu you back up if need a better picture.
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Old 10-08-12, 11:22 AM   #44
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i know it was already mentioned here but i do want to emphasize the importance of ESD (electrostatic discharge). you will need to keep that in mind when working with ECUs, or any ESD sensitive electronics.

here is a link for good info:
http://www.minicircuits.com/app/AN40-005.pdf

i highly suggest wearing a grounding wrist strap when working on the ECU while doing this fix. Any static discharge, even ones you cannot physically feel, can potentially damage components on the exposed board. the damage may not be immediate and can surface down the road. just a heads up!
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Old 10-08-12, 04:10 PM   #45
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Quote:
i highly suggest wearing a grounding wrist strap when working on the ECU while doing this fix. Any static discharge, even ones you cannot physically feel, can potentially damage components on the exposed board. the damage may not be immediate and can surface down the road. just a heads up!
agreed!! - however - here is a tip for the lazy:

don't feel like worrying about static, wrist straps, etc??

do what I do - ALL 100% cotton clothing (jeans & 100% cotton shirt) + bare feet = work on or handle even the most static sensitive devices, worry free!!

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Old 10-08-12, 04:10 PM
 
 
 
 
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1996, 400, auto, capacitors, chicago, defog, ecm, ecu, flashing, light, ls, ls400, replace, replacing, service

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