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Could anybody tell me where the ecu is in an 87 hatch, and how I can put it into diagnostic mode? I had a nissan that had a small screw on the ecu and if it was turned in one direction it would throw the ecu into diag. mode and blink out the code number in the dash, is there a way to do that with these cars too, or do I have to go out and buy a diag. tool to hook up to it?
1.5 Seconds using the search and I had this:
Quote:
Originally Posted by shepherd79
DX? Carbed?
If you are carbed there is no onboad diagnostic.
Figures, I spent about 15 minutes trying to find anything and looked through each "How-to" sub-forum to no avail, nonetheless, thank you very much for posting that for me = ).Quote:
Originally Posted by forrest89sei
Does this mean that there's no blinking light on the ecu itself under the driver's seat as there is said to be in the how to? I ran out and popped the little cap down and turned the ignition on and couldn't see any lights blinking in that box or anything. Do you think if the ECU were not functional at all, my car would still run? My driver's side floor got flooded and since then the car has been running like shit.Quote:
Originally Posted by greentee76
If you have the DX trim then your car doesn't have an ECU at all. That's because you have the carbureted version of the engine and not the fuel-injected.
Well the DX has a ECU, it's just not like the ECU a EFI Accord has.
If your ECU is messed up let me know, I have a working one for sale
Shit, so that gray box that's under my driver's side seat is just empty? Is there anything in that thing that affects the engine because I've been clueless as to why my car has been running like hell and this was my first break as to an idea what happened =(Quote:
Originally Posted by nfs480
It's not empty, it runs solenoids and other things related to the carb on these cars, Unlike the EFI ECU it doesn't have a diagnostic modeQuote:
Originally Posted by l75eya
So it's safe to say that if this big gray box under my seat happened to get....really wet due to driving in heavy rain for over an hour on the highway with a big ass hole in the rear-driver's side wheel well that led to there being about 3 - 4 inches of water on the floor in the back, that could possibly be the reason my car is running horribly and won't idle and whatnot?Quote:
Originally Posted by forrest89sei
I'm getting the feeling that this is probably the problem but just for a reality check, I'd really like to have it all spelled out nice and clear to be confirmed, because it's been over a week of messing around with the idle, air/fuel, vacuum advance, etc, etc and it's been driving me crazy.
Wanna say thanks a lot for the feedback as well, I've been reading on this forum for months and just recently posted a first thread, I've found tons of insightful info on here! 3g ftw!
Thx
I was trying to find a writeup that lostforawhile did on this but can't seem to find it. SO I will try my best to explain the theory of how this system works.
First of all Honda set up the carb to run rich as a base. The solenoid control unit(under the drivers seat) take electrical readings and open and close solenoids on the intake manifold(white saucer looking deals) to lean out the mixture when appropriate. If the box under the seat is bad generally you will revert to a rich situation.
The best source of info on the feedback carb system that I have found (recommended by lostforawile) is chilton book # 6980 Honda 1973 to 1988.
Hope this info is helpful.
By the way if you do decide you need a new box I would take Forrest up on his, I have alot of his parts on my car now, and he is great to deal with.
Good luck!
Just to clarify:
The big grey box you see under the seat is just a cover the solenoid control lives under it.
