Lexus LS400 ECU repair - Replacing leaking capacitors
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- เผยแพร่เมื่อ 3 เม.ย. 2022
- While working on project LS400 my friend called me and told about the problems he had with his 1993 Lexus LS400. The car would stall, go in limp mode, had no power, and the next moment it ran perfectly fine. Those are (a few of) the symptoms of leaking capactitors on the engine ECU. So I went to his car and removed the ECU, checked the circuit boards and indeed: 8 leaking caps. In this video I show you the ins- and outs of my repair. Spoiler alert: after this repair the still had issues that could be traced back to the ECU. Please watch Part 2 here: • Lexus LS400 - ECU Repa... , Part 3: • Lexus LS400 ECU Repair... and finally Part 4: • Lexus LS 400 ECU Repai...
0:34 Intro
3:45 What parts are required?
4:34 Soldering equipment
6:43 Antistatic wrist band (homemade)
8:40 Disassembly of the housing
10:55 Identifying the leaking capacitors
17:34 Not all caps came out without a struggle
19:05 Finally, new capsare going in!
19:50 All caps are in
21:00 Always check your work and clean up!
22:40 ECU is getting back in
23:00 First start
23:50 Test drive
24:23 Outro
Intro and outro music: Kathmandu by Dave Whitcroft - ยานยนต์และพาหนะ
Just dropping in to see how things are going. Looks like your right in the nitty gritty of it! Keep up the good work!
It's becoming quite a project Greg, the next episode is coming up soon. More power steering fun (actually, it was not fun at all). Thanks for stopping by!
Great video, and your English pronunciation of technical words is PERFECT. Bravo sir!
(Liked and subscribed)
Thanks, I have to switch between three languages every day, I try to be as clear as possible :-)
It is fine that you distribute this stuff. I have 1993 model TOO and your videos are very valua Le to me.
I like my car and try to keep it in good condition. Toyota/Lexus dealers are not of big help anymore.
Thanks for your comment Matti! If you need any help, please let me know!
Got a 93 us model. Crank no start. Got good fuel got spark replaced caps. Only code is 24 for iat but shouldn’t keep it from atleast firing up
The IAT is in the air volume sensor, did you try changing that out? In my previous '93 LS400 I had the same issues as you. Changed the AVS and all was good.
Hey Chris, I'll dive into this subject in the upcoming episode. The workshop manual has several routes to troubleshoot this fault code.
Where did you get those capacitor? I've got a 1992 LS400 that was garage kept for 12 years. Brought it to the workshop and after 7 months "most" of it got fixed. Been experiencing some symptoms like loss of power, engine stalling and recently found out my power steering is leaking. Any tips on the power steering? I saw a TH-cam video where Toyota/Lexus prefers Dextron ATF fluids instead of power steering fluid. Have you tried that out?
Hello Saf, thanks for your comment. In regard to the capacitors: I ordered them online at RS Components, they are widely available and very cheap. About the power steering fluid: Lexus prescribes plain ATF for the power steering system, I have always used that in all my LS 400's. If you are going to replace the capacitors in the ECU, make sure to also check the mass contacts in the engine bay. Corroded mass pints (Where the electrical system is grounded to the car's bodyshell) can also cause electrical issues. If you want to, I can look it up and show it in a future episode.
@@Carnold_YT yes pleasee! thank you so much for the fast response (its 12AM where I am). I recently did a throttle body service - that sorta fixed the low idle issue (for a day) but it's still idling low on my RPM gauge. As for the rest, my speedometer, odometer and temperature gauge is not working at all. The backlight does not light up. Any idea on that one? (im guessing its the ECU?)
@@saf574 In Episode 12 I show how to disassemble and repair the instrument panel. I hope that is helpful for you: th-cam.com/video/2aqwCh5TW7E/w-d-xo.html
@@Carnold_YT thanks Arnold. I’ll check it out 👍🏼
@@saf574 It's in the new episode: th-cam.com/video/qppau93QZzg/w-d-xo.html