obd0-obd1 harness
 

does anyone on here make them?

Re:obd0-obd1 harness
 

i dont believe anyone on HMT makes them. a few guys do on Honda-tech.

this company http://www.vtecfrog.com/ makes them too.

Re:obd0-obd1 harness
 

Make one yourself...

I did a flat rate OBD0 -> OBD1 conversion from scratch and finished in 2 hours and 17 minutes.

That included making the ECU harness, distributor harness, and getting donar parts from a California Accord ECU, chipping the P28, and installing it.

You can make the harness yourself. It's cake.Get female plugs from an old PM5 DPFI ECU (dime a dozen at the junkyard), and some OBD1 plugs with about 6" of wire, and you're set.

http://index.driftkids.com/Journal//...BD1Harness.jpg

Re:obd0-obd1 harness
 

could u possible make me a harness and chip my ecu for me.

Re:obd0-obd1 harness
 

No.

Re:obd0-obd1 harness
 

I like the book in the background Jason ;)

Re:obd0-obd1 harness
 

how can you type with that crappy keyboard?

get a natural one.. trust me.

Re:obd0-obd1 harness
 

Natural? ..85wpm.. seems good enough to me.

Re:obd0-obd1 harness
 

while ur at it can u make me two and chip four of my ecus and tune 3 of my cars all for free? :P

Re:obd0-obd1 harness
 

wow did i ever say for free?

Re:obd0-obd1 harness
 

oh yeah can u bang my girl too while ur at it iam alittle tired from work this week :P

Re:obd0-obd1 harness
 

lol she'd pry like it, u know get her used to a real man.

Re:obd0-obd1 harness
 

not talking about speed. if that was an issue, I'd tell you to get a dvorak layout keyboard.

it's all about the comfort.

maybe it's just my goofy arms that splay out at the elbows..

Re:obd0-obd1 harness
 

Hehe.. Canadians. ;)

Re:obd0-obd1 harness
 

I highly recommand using Heat shrink on the welds

If someone in canada need a Harness, I have 2 here ;)

Re:obd0-obd1 harness
 

I didnt know you could weld wires together, thats ------ gangstuh! my soldiering skills are just wasted when i could have used my arc welder all along ::)

Re:obd0-obd1 harness
 

lol i like to mig weld mine the arc gets too hot

Re:obd0-obd1 harness
 

Sorry guys, for us (French people, I live in Quebec) sold and welds is the same word in french, so I made a mistake.

Sorry

Re:obd0-obd1 harness
 

no its not unless im really retarded

sold = vendu
weld = soudre

maybe sold ~ soudre if u rip one of ur eyes out and u squint real hard ;)

Re:obd0-obd1 harness
 

Solderings = Soudure
Weldings = Soudure

Re:obd0-obd1 harness
 

ahhh i get it
i really know that im confused now

Re:obd0-obd1 harness
 

how much would you sell one for shilpped to the us in $USD

Re:obd0-obd1 harness
 

Brand new newbie here, so be patient. Are the wire locations (for whatever funtion each wire serves) the same for all OBD0 ECUs (also for OBD1)? In other words, can you swap out any OBD1 ECU with another OBD1 ECU without changing wire locations on the harness plugs? Does this also apply to OBD0 (can interchange OBD0 ECUs without changing harness)?

Re:obd0-obd1 harness
 

I'm 99% sure they are for OBD1.

OBD0 (Civic/Integra) are the same.

Re:obd0-obd1 harness
 

Wow, that is great news. Sure would make everything easier if they were all uniform. I'm wanting to do an OBD0 to OBD1 conversion on my 89 LXi Accord (MPFI). It uses a PJ0 ECU, for which I can find no support. I'd like to upgrade to a P75, but need help figuring out what to do. I assume I will need to make a adapter harness, but will need a pinout diagram for each of these ECUs, right? Are there any web resources you know of that have these diagrams?

Re:obd0-obd1 harness
 

Ooo... Accords.

Hrm, your best bet is to find an OBD0 Civic ECU, throw it in, and see what happends.

If it works, but throws a few codes, you know what wires to swap. :)

As far as OBD1.. Civic/Integra ECUs are the same. The differences fall for Accords/Preludes.

..same with OBD0, which is why I suggest trying an OBD0 Civic ECU before you start messing with things.

Re:obd0-obd1 harness
 

First, thanks for all the help. Second, what Civic ECU(s) would you suggest? I've got a local pick'n'pull here, so should not be too bad. Which ones would be best for a 2.0 MPFI and has a lot of support for boost?
Oh, forgot to mention, I'm trying to keep this smog legal as well. Houston requires it.

Re:obd0-obd1 harness
 

Well, the thing is you're really getting into two different things..

I was jsut suggesting that you borrow someone's ECU (a buddy's or something) and plug it in and see if it works.

Now, if you want to _run_ an OBD0 for boost support, use a PM6, and the TurboEDIT software.

Then you'll have boost and a few other features.

Re:obd0-obd1 harness
 

Sorry, forgot the other reason why I wanted to go OBD1. My dizzy is vac advanced and I wanted to change it for ECU timing control. Back to square 1?

Re:obd0-obd1 harness
 

Where can I find a pinout diagram for a OBD1 p75?

Re:obd0-obd1 harness
 

Well, not all OBD0 distributors are vac advanced.

..but before you could go to "OBD1", you need to swap to MPFI "OBD0". Then, from there, you can make another harness to go to OBD1 if you still wanted to.

..though, it sounds like you wouldn't need to for that far.

I would search Honda-Tech, first, to get the information needed to be a MPFI setup of the 88-91 Civics. Then the pin-out for OBD1 Civic/Integra is in the PGMFI Wiki (http://wiki.pgmfi.org).

Re:obd0-obd1 harness
 

Okay, could not find pinout for Integra/Civic, unless you are refering to the B16A2? That was the only one I could find. Would it be the same for a p75, or maybe a pr4?

Re:obd0-obd1 harness
 

OBD1 -> any Civic/Integra pinout will work.

OBD0 -> Looking for a 1991 Civic Si, PM6 ECU pinout.

Re:obd0-obd1 harness
 

Okay, from what I've seen so far, the PM6 you suggested is a very popular ECU choice, so that is good as far as support goes. Three things though:
1. Will this be okay on a 2.0L engine?
2. Is the 91 CRX Si distributor electronic advance?
3. Do you know how similar OBD0 harnesses are? Can I just swap ECU's, or will there be different sensors/inputs that will need to be modified?
Again, apreciate you patience on this.

Re:obd0-obd1 harness
 

Here is all the info you need to build these harnesses.
http://www.pgmfi.org/twiki/bin/view/...KurtsOBD0-OBD1

I have built 3 of these using this guide and every car fired right up with no problems. Just make sure to take your time and double check each connection because its really easy to mix a pin or two around after soldering so many connections.

Re:obd0-obd1 harness
 

Re:obd0-obd1 harness
 

Guys, thanks for all your help. Omahaturbocivic, great link. That will be my bible when I start. By the way, the three cars you've done these in, any Accords? Jason, thanks especially for your patience ;D! I'll be sure to let you know how it turns out. I appreciate your suggestion on the CRX, and I think I will start out with that for my first try. If it fails, I guess I will go with the OBD1 conversion. Again, thanks a bunch.

Re:obd0-obd1 harness
 

should make good conversion sites a sticky or put with engine mangagment sticky

Re:obd0-obd1 harness
 

No accords yet. I have hardwired one civic std with obd1 clips using this guide and I have also built 2 harnesses for a hf crx and si hatch since then using this guide. I have also used an obd0-1 harness fromhttp://www.jkobdconversionharness.com/ which also worked exactly like the harnesses I built. As stated above your best bet is to find a ecu pinout for your accord and compare it to 91 civic si pinout or the obdo side of the guide I posted. If it all looks pretty much the same you are good to go with either the obd0 pm6 or the obd1 harness as posted. If there are differences you will have to switch the wires in the car or just switch them in the harness if you do convert to obd1. Even if the wiring is a bit different that should be able to be overcome if you are comfortable with wiring and have a good accord pinout.

You biggest issue may be deciding what mpfi distributor will be your best bet to fit on the motor. If you stay obd0 you could possibly use a d16a6 b18a or b16a distributor depending on if any of those can be made to fit your motor, obd1 you can use pretty much whatever distributor you can get to fit best wether that be from a newer accord, civic, integra, whatever. There may not be one that fits exact but by drilling out or cutting some of the legs you can hopefully get something to work. Like stated above you may be adding adding a few wires from the distributor to the ecu you as well as splicing in different clips.

Re:obd0-obd1 harness
 

Hey, great info. Yeah, I've got a pinout diagram for my ol' PJ0, so I'll be doing some comparing. Is the PM6 in the '90 the same as the '91? Just wondered since you guys refer to only the '91. One guy I've seen used a F-22 dizzy ('90-'93 Accord) in his OBD swap, but it did need a bit of modifying to fit. Thanks again for the help.
PS Where can I get a pinout diagram for PM6, PR4 and/or P75?