I'm looking for info on how to build your own conversion harness, I've searched this message board, homemadeturbo, pgmfi.org and ecumulti. I can't find any good links, the only information I have found at all is in PGMFI's WIKI library. I'm looking for clearer information, there charge is just a text pad write out. If you have any links that could help me I'd really appreciate it. I have all the necessary hardware, I'm just looking for the pinouts.

 

http://www.geocities.com/chipm....html

If you want the honest truth.. Just buy one.. Its a real pain in the *** soldering all those wires together.. I did it and it took me like 2 weeks of working about 1 hour each night.. Not to mention it looks like *** when you get it done..

But if you still want to do it, Go to the junkyard and find a 92-95 civic and cut the ecu wiring harness(3 plugs) out of it.. Then go find a 88-91 crx/civic and grap the ecu out of it.. If you can find a dx or hf crx that will make matters alot eaiser since those are the ecus no one wants..

Open the obd0 ecu up and melt the solder around the connectors and pull them off.. Wala.. Follow the directions in the link I gave you above and your good to go..

Also the dude in the link talks about straight numbering and zig-zag numbering.. Kinda confusing if you dont know how its done but.. Lets say you have a 10 pin connector..

straight numbering is like this

1 2 3 4 5
6 7 8 9 10

Zig-zag numbering on the same connector is like this

1 3 5 7 9
2 4 6 8 10

If you have any question let me know.. I built my harness about a month ago and it works great..

 

Try the Hybrid forums. I know they list the pinouts somewhere.
-Ryan

 

Thanks I ended up figuring it out that original night I posted and was able to get half of the harness done and it actually looks identicle to the jk harness. I used 18 gauge wire and nice heat shrink tubing. I'm going to use 20 gauge wire on the smaller black connector, I think I have 20 connections to go on that connector but all the connections on the green connector are done with.



I used the picture of the JK harness in combination with the WIKI pinout from PGFMI to build it.

 

Looks nice... If you do want the pin-outs for obd0 and obd1 ecus go here
http://tech.hybridgarage.com/tech/index.html#ecu

 

lowcashracing.com also checkout the groupbuycnter.com great prices

 

Come on, it's not really all that hard to make a jumper (just takes some time if you want it to look nice). The engine harness is what really takes the time to do cleanly. This is one I made awhile back...

 

I like the look of the stock wires for the harness, I'll have to cut the harness a lot higher next time, that will ensure I have the proper gauge wire and will cut down on half the soldering connections. Thanks for the pic.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">Come on, it's not really all that hard to make a jumper (just takes some time if you want it to look nice). The engine harness is what really takes the time to do cleanly. This is one I made awhile back...

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WOW.. Thats a really good looking harness.. The one that I made looks like junk compared to this one.. I might try and make another one and make it look alot better this time around..

 

haha, thanks. Yea, I'm extremely meticulous when it comes to wiring so I try to get it as nice as possible (pulling out all the unused nonOBD pins from the female connectors, all the shrink wrap has to be cut even, etc.). Just me being weird. You might have seen this aswell but here's an OBDI converted EF harness that I did for Will's Rex about a month ago. Just wired up with an OBDII dizzy, GM 3 bar MAP, and a oxygen sensor connector. Also depends on the year of the bottom end but I normally swap the water pipe/thermostat housing for an OBDI one as I like the thermostat mounted FANC switch (this also has to be changed in the wiring). If it's a relatively stock motor or running high impedance injectors I normally pull out the resistor box but since Will's running some bigger injectors on his FI setup I just left it alone.

 

Purrrty.. How did you solder the wires on to the obd0 pins.. Just hold the wire above/below the pin and drop some solder on it??

 

I don't know about them, but that doesn't sound like a strong connection. I tin each connection, the wire and the pin first, then I heat up the pin side and let it melt the wire side. It makes for a very strong connection. Oh yeah I got done last night!! Thanks Everyone

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">I don't know about them, but that doesn't sound like a strong connection. I tin each connection, the wire and the pin first, then I heat up the pin side and let it melt the wire side. It makes for a very strong connection. Oh yeah I got done last night!! Thanks Everyone </TD></TR></TABLE>

Thats basically what I did.. I didnt tin the wire first though.. I held the wire on the bottom of the pin and dropped solder on top of the pin and let it run over the pin and the wire.. Its actually very strong because I tried to pull it off and couldnt do it even with a good amount of effort..

 

Good to hear, whenever I solder any connection I "silver" both ends first, takes a little more time but it's the only way I do it. Just me tho

 

After looking at the harness's blownhatch makes there are a lot more unconnected wires that you have to hook up. Does anyone know what these are for? I count 10 from the picture, I imagine four of them are for:

1. VTEC Solenoid
2. VTEC Pressure Switch
3. O2S Heater
4. Shielded Knock Sensor
5. ?? Service Connector ?? (From what it looks like, maybe switched to a ground?)
6.
7.
8.
9.
10.

 

Yea, I don't know why he does it that way but since I've never actually worked with one of his I don't really know what they are for. To me it just seems easier to run all the wires through the jumper itself (no hardwiring required, but then you have to add pins to the nonOBD pig tails so maybe that's why). As for the SCS connector that's all you do and is how I also do it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">After looking at the harness's blownhatch makes there are a lot more unconnected wires that you have to hook up. Does anyone know what these are for? I count 10 from the picture, I imagine four of them are for:

1. VTEC Solenoid
2. VTEC Pressure Switch
3. O2S Heater
4. Shielded Knock Sensor
5. ?? Service Connector ?? (From what it looks like, maybe switched to a ground?)
6.
7.
8.
9.
10.</TD></TR></TABLE>

The service connector doesnt have to be added.. Acutally im not sure on blownhatches harness but on the one I build I just used the obd0 service connector under the hood..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">The service connector doesnt have to be added.. Acutally im not sure on blownhatches harness but on the one I build I just used the obd0 service connector under the hood..</TD></TR></TABLE>
That's cool, how does the nonOBD under the hood connector work tho? Do you just tie the OBDI point for the SCS (D4) into it? We all have our own little ways of doing things, just curious

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">
That's cool, how does the nonOBD under the hood connector work tho? Do you just tie the OBDI point for the SCS (D4) into it? We all have our own little ways of doing things, just curious </TD></TR></TABLE>

I think we are talking about 2 different things here.. The service connector that I am talking about is a 2 wire plug that you jump to see the ecu codes and also is used to adjust the timing..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">
That's cool, how does the nonOBD under the hood connector work tho? Do you just tie the OBDI point for the SCS (D4) into it? We all have our own little ways of doing things, just curious </TD></TR></TABLE>

Opps.. Didnt read your post good enough.. Yes, pin d4 goes to the obd0 connector under the hood and the other wire at the connector goes to ground.. So you just ground D4 and you jumped it.

Go here and look at pin D4.. This also has some other useful info in there..

http://www.boosted.org/obd0_to_1.php

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">

Opps.. Didnt read your post good enough.. Yes, pin d4 goes to the obd0 connector under the hood and the other wire at the connector goes to ground.. So you just ground D4 and you jumped it.

Go here and look at pin D4.. This also has some other useful info in there..

http://www.boosted.org/obd0_to_1.php


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It should be noted that the link provided above uses the Zig Zag method of numbering, had me confused for a second.

 

Thanks a lot for the link though, I like how they had comments for integrating all of the additional O2 sensor wiring into the harness. I'm going to go splice into my harness right now to add in all that stuff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">Thanks a lot for the link though, I like how they had comments for integrating all of the additional O2 sensor wiring into the harness. I'm going to go splice into my harness right now to add in all that stuff. </TD></TR></TABLE>

Splice away.. In your previous post you said about the zig-zag method.. The only place that used the "straight numbering" is this link

http://www.geocities.com/chipm....html

I posted this eairler in the thread.. Everyone else including Honda uses the zig-zag method.. Good luck on adding you stuff to your harness.. I think tonight im going to pull my harness and add in the wire for a knock sensor and a few other custom things..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">After looking at the harness's blownhatch makes there are a lot more unconnected wires that you have to hook up. Does anyone know what these are for? I count 10 from the picture, I imagine four of them are for:

1. VTEC Solenoid
2. VTEC Pressure Switch
3. O2S Heater
4. Shielded Knock Sensor
5. ?? Service Connector ?? (From what it looks like, maybe switched to a ground?)
6.
7.
8.
9.
10.</TD></TR></TABLE>


First off It's Blown90hatch. Not blownhatch. I make my harnesses so they can be used in many different applications.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Yea, I don't know why he does it that way but since I've never actually worked with one of his I don't really know what they are for. To me it just seems easier to run all the wires through the jumper itself (no hardwiring required, but then you have to add pins to the nonOBD pig tails so maybe that's why). As for the SCS connector that's all you do and is how I also do it.</TD></TR></TABLE>

90% of my customers are looking for the easiest method possible or else they would be doing the conversion themselves. I do not make the changes in my conversion harness because that would require my customers to have to add pins, etc. Many, if not most of them do not know how to do this. I include very detailed instructions of the installation with each sensor identified and the wire colors, etc. I receive emails and phone calls on a daily basis from people who have tried to save 20 bucks on another harness and they constantly have problems because the harness is incorrect or the instructions are lame. I have built and sold over 300 of these harnesses and they can be found all over the world.

Jason

 

Sorry about the name confusion, I've done a lot of research throughout any thread having to do with conversion harnesses and it definitly seems like his are the best. The tech support he gives must be great because he took the time in private messages to help me out with questions I had about building my harness. So if you dont want to spend the time doing 96 soldered connections I would definitly advise going with a quality harness from his site http://www.jkobdconversionharness.com.