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

 

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

 

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





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


Now these two look conspicious too me marked on them are numbers
R783
.43 OHMs K

 

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?

 

Hey guys, i dont own an LS but do you think that this could also be the issue for a 93 GS?

 

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.

 

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."

 

Most DEFINITELY

 

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!

Attachment 501425Attachment 501695Attachment 501426Attachment 501427Attachment 501695Attachment 501428Attachment 501695Attachment 501429


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!

 

you only listed 7 caps

PS - I think the resistors at R783 are likely fine.

 

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

 

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

 

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.

 

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!

 

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!!