Crash Course In Brain Surgery Replacing Capacitors On ECU - Page 2 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Crash Course In Brain Surgery Replacing Capacitors On ECU

WJ Tube Doors Now Available!*VOTE NOW Help Metalcloak Giveaway an XJ Suspension*TJ 5.25" Speaker Adapters - NalinMFG

Reply
Unread 10-23-2008, 08:58 PM   #16
foggybottombob
Registered User
1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,813
Well electrolytic caps have a gel in them that dries out over time and it can leak out. It is probably corrosive too. Like the original post mentioned, you have to install an electrolytic cap one way. If the cap has a long line on one side like the one in the pic then that is the negative side. Sometimes they will have a + on them. The +, of course denotes the positive side. So just look at which way the cap is installed that you take out. Electrolytics will also have a max voltage stamped on them like 25V or 16V. Make sure you buy caps that have a max voltage at least as high as the ones you are pulling out. If you take out one that says 25V then you can put one back in that says 25V or higher. Just as an FYI, if you install and electrolytic backwards the metal cap on the top of it will blow off like a little light weight bullet when it is energized. Just a little fun with electronics 101.

__________________
J-4000 truck Dana 60-2 brake parts for sale. Drums, backing plates & other parts
foggybottombob is offline   Reply With Quote
Unread 11-09-2008, 08:09 PM   #17
fhgjikb
Registered User
 
Join Date: Jun 2006
Location: ma
Posts: 6
Just had the same problem, and used this post to fix it. Everything worked great and fired up 1st try. I'm currently at school and don't have a solder gun so I prepped everything and brought it to a local computer/electronics repair shop and had a nice solder job done for $15. Only trouble I had was trying to pry the ECU out of the plastic casing itself without damaging it.
Thanks for the post!
fhgjikb is offline   Reply With Quote
Unread 11-09-2008, 08:58 PM   #18
rustywrangler
Got my eye on you.....
 
rustywrangler's Avatar
 
Join Date: Apr 2005
Location: Syracuse, NY
Posts: 18,616
Added to FAQ.
__________________

Congenital Heart Disease is a reality for me, BOTH of my children have it. Please read up and become aware for future generations

Lydia Ann-Acquired 08/05/05 Open Heart surgery 08/10/05
Jacob Patrick-Acquired 01/17/08 Open Heart surgery 02/15/08
rustywrangler is offline   Reply With Quote
Unread 11-09-2008, 10:19 PM   #19
sentinal02
H2 Recovery Team Member
 
sentinal02's Avatar
1992 YJ Wrangler 
 
Join Date: Feb 2003
Location: New York
Posts: 6,688
Quote:
Originally Posted by rustywrangler View Post
Added to FAQ.
actually it was already in there under my "cold start" thread rusty can't hurt to have its own link though
__________________
RIP: '88 YJ 2.5L Ax-5 NP231
Posi-Loked. Herculined. Optima yellow top. 1" Shackle, 2" BDS. Cragar 397's Aussie front.

92 YJ 4.0L Ax-15 231
5" springs, 1" shackle 31's or 35's depending on my mood
sentinal02 is offline   Reply With Quote
Unread 11-16-2008, 09:49 AM   #20
plastic55
Registered User
 
Join Date: May 2006
Posts: 42
Thank You. Used this thread and http://www.jeepforum.com/forum/f12/91-hard-no-start-long-cranks-cold-explained-490788/
to diagnois and repair 95 2.5. Thanks again
plastic55 is offline   Reply With Quote
Unread 01-08-2009, 04:23 PM   #21
Anonymous6915
Registered User
2009 JK Wrangler 
 
Join Date: Dec 2008
Location: New York
Posts: 639
Quote:
Originally Posted by HalfShaft View Post
4.0 caps are 22Uf and 32 volt. Radio Shack 1.29 each.

I will provide this information provided you do not let another soul know.

Be carefull with what kind of sealant is used to re-seal the caps/ solder points and the circuit board to the case. Make sure there is no water or water based solvent in it what so ever. "a guy I know" used caulk, didn't check that it was latex based. Bad for everything including solder, circuit boards and traces on them.

Everything is better now, "he" got real good at fixing circuit board traces.

Just a little humble advice.
wait is it 22 or did u mean 220?
Anonymous6915 is offline   Reply With Quote
Unread 01-08-2009, 07:07 PM   #22
Gonewhln
Registered User
2006 TJ Wrangler 
 
Join Date: Nov 2008
Location: Currituck, NC
Posts: 1,175
It should be 22
Gonewhln is offline   Reply With Quote
Unread 01-08-2009, 09:09 PM   #23
Anonymous6915
Registered User
2009 JK Wrangler 
 
Join Date: Dec 2008
Location: New York
Posts: 639
well i went to radio shack and could only find 220uf 35volt cap's. does anyone have a pic of what i should be looking for? iv never done anything like this before...
Anonymous6915 is offline   Reply With Quote
Unread 01-08-2009, 11:33 PM   #24
sentinal02
H2 Recovery Team Member
 
sentinal02's Avatar
1992 YJ Wrangler 
 
Join Date: Feb 2003
Location: New York
Posts: 6,688
Quote:
Originally Posted by Anonymous6915 View Post
well i went to radio shack and could only find 220uf 35volt cap's. does anyone have a pic of what i should be looking for? iv never done anything like this before...
http://www.radioshack.com/product/in...ductId=2102588

here ya go
__________________
RIP: '88 YJ 2.5L Ax-5 NP231
Posi-Loked. Herculined. Optima yellow top. 1" Shackle, 2" BDS. Cragar 397's Aussie front.

92 YJ 4.0L Ax-15 231
5" springs, 1" shackle 31's or 35's depending on my mood
sentinal02 is offline   Reply With Quote
Unread 01-09-2009, 05:08 AM   #25
Richmond88yj
Eat, Sleep, Jeep
 
Richmond88yj's Avatar
1988 YJ Wrangler 
 
Join Date: Mar 2004
Location: Chesterfield VA
Posts: 2,112
I did this per the instructions above. Took about 2 hours and 6 bucks.

Most of the time was spent removing the RTV from around the capacitors.

Overall very simple job with great results.
Richmond88yj is offline   Reply With Quote
Unread 01-09-2009, 07:38 AM   #26
Anonymous6915
Registered User
2009 JK Wrangler 
 
Join Date: Dec 2008
Location: New York
Posts: 639
Quote:
Originally Posted by sentinal02 View Post
thanks thats exactly what i needed. will be doing this tonight. hopefully this is my problem and i can get her running. need to take her to the shop and do the tie rods tomorow...
Anonymous6915 is offline   Reply With Quote
Unread 01-09-2009, 08:17 AM   #27
frhrwa
Fish'n Fool
 
frhrwa's Avatar
1984 CJ7 
 
Join Date: Dec 2008
Location: Deer Park (north of Spokane), Washington
Posts: 1,360
very important 1st step... DISCONNECT the battery first!..
frhrwa is offline   Reply With Quote
Unread 01-09-2009, 10:42 AM   #28
Anonymous6915
Registered User
2009 JK Wrangler 
 
Join Date: Dec 2008
Location: New York
Posts: 639
heres a stupid question....wat happens if i dont disconnect the battery first?
Anonymous6915 is offline   Reply With Quote
Unread 01-09-2009, 01:40 PM   #29
Anonymous6915
Registered User
2009 JK Wrangler 
 
Join Date: Dec 2008
Location: New York
Posts: 639
ok ill admit it. i didnt disconnect my battery before doing this. i havnt tried to start her yet. havnt installed the ecu back in yet...did i just fry my ecu?
Anonymous6915 is offline   Reply With Quote
Unread 01-09-2009, 03:01 PM   #30
the_mork
Registered User
1994 YJ Wrangler 
 
Join Date: Oct 2008
Location: Wisconsin
Posts: 448
Probably not. Disconnect it before putting the ecu back in.

The issue is when you have partial contact and you have arcing electricity that could go where it shouldn't. Usually you just get a light show but even with the battery connected most of the time installing an ecu you wont even realize that there is current around, it really is just a safety measure.
the_mork is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.