Go Back   Honda-Tech > Honda and Acura Model-Specific Technical Forums > Honda Accord (1990 - 2002)
Sign in using an external account
Register Forgot Password?
Search


Welcome to Honda-Tech!
Welcome to Honda-Tech.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread
Old 05-13-2011, 05:54 AM   #1
GOTSTANG
Honda-Tech Member
1990 Honda Accord
 
Join Date: May 2011
Posts: 12
iTrader Rating: (0)
Default 1990 Honda Accord EX ECU code 43.

Ok I just bought this car about 2 weeks ago. changed out distributor cap and spark plugs havent had the oil change yet. but will soon. I love this car..Lately however Ive had issues with this code whenever im at a red light or idling it acts as if it wants to cut off i looked up the code and it says its the O2 or fuel supply system. rarely at times while driving it would act as if gas isnt getting to the cylinders..ill pull off first gear revs fine however when i git 2nd or 3rd gears RPMS shoot all the way down and it acts like its gonna stop. However when i mash the gas all the way in the RPMS pick all the way up. is this just a faulty o2 sensor or a dirty fuel injector? If it is a o2 sensor where is it located?
GOTSTANG is offline   Reply With Quote
Old 05-13-2011, 08:47 AM   #2
StreetsideStig
Honda-Tech Member
Garage is empty, add now
 
Join Date: Mar 2011
Posts: 1,382
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

The o2 sensors are right at the bottom of the exhaust manifold in the front and next the the catalytic converter. They could be causing the code, but I don't think they're causing the problem. One common issue with these (including mine, a '90 LX) is the main relay.

Click the image to open in full size.

(It's the grey one, up under the driver's side dash)

It controls the fuel pump, and when it starts to go bad, it can cut out some times. It's a simple fix, but the part costs about $50, so you'll want to check first to make sure that's actually the problem. Pull the cover off and take a look at the circuit board. If you see any carbon scoring and it looks burnt, that's probably the issue.

If you're handy with a soldering gun, you can try to resolder the points yourself, or you can get a new one from Autozone.

Your issue sounds exactly like what was happening to mine. Let me know if you have any questions, and keep us updated.
StreetsideStig is offline   Reply With Quote
Old 05-13-2011, 01:06 PM   #3
GOTSTANG
Honda-Tech Member
1990 Honda Accord
 
Join Date: May 2011
Posts: 12
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

Is this located where the fuses are under the dash? I see tons of plugs and i dont wanna go unpluging everything i see lol sorry if i seem a lil slow
GOTSTANG is offline   Reply With Quote
Old 05-13-2011, 09:15 PM   #4
brakedrum
Honda-Tech Member
Garage is empty, add now
 
Join Date: Oct 2004
Posts: 361
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

If it's never been replaced, almost certainly bad O2 sensor. The bogging down under load symptoms are typical for it. New Denso or NGK ones for your car available for $60 or less. Install is DIY if you have jackstands and the socket to do it. Any small muffler shop should be willing to slap it in for you for reasonable labor charge. Note if you DIY: the old o2 is virtually impossible to remove while it is cold. Get the engine good and warm before trying to remove it. Be sure to pull the backup fuse to clear that code after installing the new O2. That will make the system see the new part instead of still mapping off of the failing old one.
__________________
93 Honda Accord EX Sedan MT 225,000
brakedrum is offline   Reply With Quote
Old 05-14-2011, 12:05 AM   #5
holmesnmanny
Honda-Tech Member
Garage is empty, add now
 
Join Date: Dec 2008
Posts: 6,202
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

http://www.troublecodes.net/honda/hondadtc.shtml

First replace the fuel filter. If it still does it could be the fuel pump going out.

The main relay is on the drivers side under the dash up along the door side of the underside of the dash.
__________________
91 Accord w/ H22A swap: Newest update on CARB cert...... Passed smog at the REF...Offically CARB certified !!!
holmesnmanny is offline   Reply With Quote
Old 05-14-2011, 04:22 AM   #6
GOTSTANG
Honda-Tech Member
1990 Honda Accord
 
Join Date: May 2011
Posts: 12
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

Ok My ECU is shooting codes 16 and 43 now my right green light is also flashing.
GOTSTANG is offline   Reply With Quote
Old 05-16-2011, 04:28 AM   #7
StreetsideStig
Honda-Tech Member
Garage is empty, add now
 
Join Date: Mar 2011
Posts: 1,382
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

Quote:
Originally Posted by brakedrum View Post
If it's never been replaced, almost certainly bad O2 sensor. The bogging down under load symptoms are typical for it. New Denso or NGK ones for your car available for $60 or less. Install is DIY if you have jackstands and the socket to do it.
Yep. After more research, (and my own experience this weekend) I agree. This could be the problem. The needed socket has a slot in it for the cords and looks like this:

Click the image to open in full size.

It's about $10 at a parts store. Here's the trouble with our generation Accord, though. The upstream O2 sensor, which is right on the exhaust manifold, is in a tight spot. Getting the socket in there isn't a problem, but there isn't room for the actual wrench next to the radiator fan. Since I had already cut off half my o2 sensor, I was able to use a claw hammer, putting the claws in the slot and turning. It worked reasonably well. I have another idea if this doesn't work.

O2 sensors (I think) are generally good for about 100k, so even if that's not the problem, replacing them isn't a bad idea.

As for the main relay, it's up under the dash between the steering column and the door. Don't worry too much about pulling things out. If you pull the wrong one, you can just reconnect it. All of the cables have different connections and only plug into what they're supposed to.

Keep us updated.
StreetsideStig is offline   Reply With Quote
Old 05-16-2011, 05:51 PM   #8
gandalf
Honda-Tech Member
Garage is empty, add now
 
Join Date: May 2009
Posts: 52
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

Your main relay is located under the dash to the left of your steering column...it will be behind a silver box about 3" X3"in X 1/4 in . the the relay will behind it. it's time consuming but and easy fix...Oreilly's has the relay about 20$ cheaper than anyone else....DO NOT get this part from a Salvage Yard!!!!
gandalf is offline   Reply With Quote
Old 05-18-2011, 06:41 PM   #9
brakedrum
Honda-Tech Member
Garage is empty, add now
 
Join Date: Oct 2004
Posts: 361
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

My o2 sensor failed so slowly as the miles racked up on the car that it never threw a code as it deteriorated, or when it was no longer able to do the job at all. Everything just got old together and the ECU thought the bad o2 was hunky dory. I had noticed the car wasn't quite right almost 50,000 miles before it got serious. By the time it became a drivability issue (bogging under load) I was so sure it was a miss in the ignition system that I spent weeks checking everything in that system but thankfully I refused to start replacing stuff.

I finally noticed a kind of a fuel smell after one of the horrendous bogging drives. Turned out that was unburnt fuel or excess air from the too rich/lean mixture backing up into the system. IOW, my car had been CHOKING, not missing. One night it showed me the final proof. I turned off the ignition and the engine sort of ran on for a few seconds, ending with a sound reminiscent of the dieseling that old engines used to do when they were in need of carburetor work. A kind of desperate exhale; almost like the system was breathing a sigh of relief that the bad mix had finally stopped.

My IACV had been operating on bad information from the ECU based on bad information from the o2 sensor. Rich/lean, it couldn't get it right and therefore there was no way the engine could haul the 2980 pounds, plus me and my passengers up and down the road.

I replaced the o2 and set the idle (I had tried to adjust it during the episodes) and the car has run perfectly ever since. Never had such a small part cause me as big a problem as that little o2 did. Very frustrating. I bet more than a few good Accords got sold cheap by frustrated owners because of that sensor.
__________________
93 Honda Accord EX Sedan MT 225,000
brakedrum is offline   Reply With Quote
Old 05-22-2011, 05:11 PM   #10
GOTSTANG
Honda-Tech Member
1990 Honda Accord
 
Join Date: May 2011
Posts: 12
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

Quote:
Originally Posted by brakedrum View Post
My o2 sensor failed so slowly as the miles racked up on the car that it never threw a code as it deteriorated, or when it was no longer able to do the job at all. Everything just got old together and the ECU thought the bad o2 was hunky dory. I had noticed the car wasn't quite right almost 50,000 miles before it got serious. By the time it became a drivability issue (bogging under load) I was so sure it was a miss in the ignition system that I spent weeks checking everything in that system but thankfully I refused to start replacing stuff.

I finally noticed a kind of a fuel smell after one of the horrendous bogging drives. Turned out that was unburnt fuel or excess air from the too rich/lean mixture backing up into the system. IOW, my car had been CHOKING, not missing. One night it showed me the final proof. I turned off the ignition and the engine sort of ran on for a few seconds, ending with a sound reminiscent of the dieseling that old engines used to do when they were in need of carburetor work. A kind of desperate exhale; almost like the system was breathing a sigh of relief that the bad mix had finally stopped.

My IACV had been operating on bad information from the ECU based on bad information from the o2 sensor. Rich/lean, it couldn't get it right and therefore there was no way the engine could haul the 2980 pounds, plus me and my passengers up and down the road.

I replaced the o2 and set the idle (I had tried to adjust it during the episodes) and the car has run perfectly ever since. Never had such a small part cause me as big a problem as that little o2 did. Very frustrating. I bet more than a few good Accords got sold cheap by frustrated owners because of that sensor.
Yea...so it has to be my O2 then i mean while im idling....it bogs and chokes likes its gonna shut off...gets REALLY bad when i turn on my ac...just got the car...and moneys kinda tight so im trying to do 3 things at one...get a tag pay the note...and try to get this fix..like i said i love the car...pretty powerful and fast. and i wanna tune it. i tried finding the o2 when i took off the exhaust manifold looks like id be better jacking it up. so when i DO change it how do i get the ECU to see the new one thats in. and will i have to fool with it when i get my injectors clean and oil changed?
GOTSTANG is offline   Reply With Quote
Old 05-25-2011, 11:45 AM   #11
a.j.1990
Honda-Tech Member
Garage is empty, add now
 
Join Date: May 2011
Posts: 6
iTrader Rating: (0)
Default Re: 1990 Honda Accord EX ECU code 43.

HEllo,
I do have the same problem,but I did change o2 sensor along with spark plugs and cables. dude at autozone told me that distributor gives me problems, well I am about to check main relay..
a.j.1990 is offline   Reply With Quote
 
 
 
submit to reddit
Reply

Tags
10, 1990, 2002, 90, accord, cap, code, codes, distributor, ecu, fault, honda, install, oxygen, problem, sensor, tcm, upstream

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -8. The time now is 07:56 AM.



2008 Copyright, InternetBrands Inc.
Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Honda-Tech.com content, comments, or advertising. Honda-Tech.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Honda-Tech.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Emails & Contact Details