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Old 02-06-2012, 11:24 PM   #1
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Icon2 OBD2 to OBD1 conversion?

Okay so my car (98 ek coupe) has obd1 d15b7 swap with a obd2 harness. The previous owner was a complete moron and hacked the wiring harness to swiss cheese.

I plan on doing a Z6 swap in the near future and wanted to know:
-Should I just get a new obd2 harness?
-Convert the whole car to obd1?
-How do I convert the car to obd1? (change dash harness and what else)
-If I change the dash harness does that mean I can directly plug in a obd1 ecu without a jumper harness?

any input is greatly appreciated!!!
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Old 02-06-2012, 11:38 PM   #2
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Default Re: OBD2 to OBD1 conversion?

Where do you live? Did he hack up the dash harness too?

If not, grab any 96-98 harness. (ex should be the easiest to use)


And no, you can't just drop a obd1 dash harness in. It doesn't work like that.

Just so you know. OBD2a engine harness, get a OBD2a dash harness. Other wise there will be some wiring involved. De pining plugs,etc.

OBD2b engine harness, get a OBD2b dash harness, however, this will require the use of the 99-00 style climate control.

For you're shake, keep the car OBD2a.

To go to OBD1, get a jumper harness, and whatever OBD1 ecu that will work for you're setup. However, I don't think you can do this in cali so location is important.

Also, not you're swap is technically illegal, just to began with. So if you have to worry about any emissons crap, re-think you're swap.
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Old 02-07-2012, 05:21 AM   #3
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Default Re: OBD2 to OBD1 conversion?

he can make a z6 pass emissions but he would have to run a y7 or y8 ecu and do the cfk trick or put a y7/8 oil pain and oil pump on for the crank sensor. then swap back to an obd1 ecu when ur done.
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Old 02-07-2012, 07:49 AM   #4
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Default Re: OBD2 to OBD1 conversion?

Thanks for all the input. And I live in Louisiana, i used to live in Seattle (Pacific Northwest rules!!). And the dash harness is still intact. I want to do the climate control swap so should i just get the obd2b dash harness and be done with it? And my state doesnt run emission so im lucky on that. But I should just get another odb2a 98 EX engine harness and swap the dash harness with a obd2b?
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Old 02-07-2012, 08:03 AM   #5
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Default Re: OBD2 to OBD1 conversion?

No you need to match up engine harness with dash harness. So if you want to swap the climate control then better get a engine harness that's obd2B. To make it easiest why not just put a y8 back in it? Y8+ harnesses+ ecu is all you'll need.
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Old 02-07-2012, 10:50 AM   #6
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Default Re: OBD2 to OBD1 conversion?

Definitely get a different, non hacked harness. My headlight harness and engine harness was hacked to **** when I got my car and it tried fixing them. It was a nightmare and I just ended up buying new harnesses.
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Old 02-07-2012, 11:16 AM   #7
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Default Re: OBD2 to OBD1 conversion?

Quote:
Originally Posted by apexi_rsx View Post
he can make a z6 pass emissions but he would have to run a y7 or y8 ecu and do the cfk trick or put a y7/8 oil pain and oil pump on for the crank sensor. then swap back to an obd1 ecu when ur done.
The engine has to be the same year or newer, or it is illegal. If I remember correctly, that is federal.

This came from the EPA.

For light-duty vehicles, installation of a light-duty engine into a
different light-duty vehicle by any person would be considered tampering
unless the resulting vehicle is identical (with regard to all emission
related parts, engine design parameters, and engine calibrations) to a
certified configuration of the same or newer model year as the vehicle
chassis,
or if there is a reasonable basis for knowing that emissions
are not adversely affected as described in Memo 1A. The appropriate
source for technical information regarding the certified configuration
of a vehicle of a particular model year is the vehicle manufacturer.




Runing a Y7 ecu wouldn't do any good, it will throw CEL's.

Quote:
Originally Posted by MEn'MYEK View Post
Thanks for all the input. And I live in Louisiana, i used to live in Seattle (Pacific Northwest rules!!). And the dash harness is still intact. I want to do the climate control swap so should i just get the obd2b dash harness and be done with it? And my state doesnt run emission so im lucky on that. But I should just get another odb2a 98 EX engine harness and swap the dash harness with a obd2b?
PNW


You can't! The plugs will not match, it wont work.

OBD2a engine harness, OBD2a dash harness. OBD2a to OBD1 jumper.
OBD2b engine harness, OBD2b dash harness. OBD2b to OBD1 jumper.
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Old 11-02-2012, 08:05 PM   #8
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Icon5 Re: OBD2 to OBD1 conversion?

I have a D16Y7 complete head on a
complete d15b7 short block in a
1996 Civic dx stock wire harness and a
OBD2a to OBD1 jumper harness with a
OBD1 P06 ecu
My question is do i need a OBD1 distributor and OBD1 alternator to run this setup?
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Old 11-02-2012, 09:56 PM   #9
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Default Re: OBD2 to OBD1 conversion?

you can use an obd2 alt and dizzy. Just get the ones that match your current engine harness.
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Old 11-03-2012, 05:08 AM   #10
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Default Re: OBD2 to OBD1 conversion?

You may also want to pick up some Y8 injectors as the Y7 injectors are 180cc and the P06 looks for 240cc. Also you can't run the Y7 intake manifold and throttle body with the p06 as the y7 uses a 3 wire IACV and the p06 uses a 2 wire. You'll need to use any other d series intake manifold with a 2 wire and swap the wires at the ECU and the IACV connector to accommodate a 2 wire IACV.
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Old 11-03-2012, 02:04 PM   #11
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Default Re: OBD2 to OBD1 conversion?

Quote:
Originally Posted by HondaPartsHero View Post
You may also want to pick up some Y8 injectors as the Y7 injectors are 180cc and the P06 looks for 240cc. Also you can't run the Y7 intake manifold and throttle body with the p06 as the y7 uses a 3 wire IACV and the p06 uses a 2 wire. You'll need to use any other d series intake manifold with a 2 wire and swap the wires at the ECU and the IACV connector to accommodate a 2 wire IACV.
Thanks for all the help guys. I have a d16y8 intake manifold complete with injectors can i swap that or do i need a obd1 intake manifold?
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Old 11-03-2012, 04:56 PM   #12
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Default Re: OBD2 to OBD1 conversion?

You can use the y8 as long as it has the IACV on the back but will still have to convert the plug to 2 wire and move the ECU pins
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Old 02-02-2013, 02:05 AM   #13
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Default Re: OBD2 to OBD1 conversion?

Ok so i have a question about a wiring harness so ill start with the car and the issue the car is a 1995 cx hatch from canada and the engine is a 1996 b18c jdm type r ( i did not do the swap myself speed factory did ) and vtec just stopped working after a little bit of searching i think i have found the issue and that would be in the wiring harness because when i wiggle the wire on the back of the ecu it starts working now what do i do to make that a permanent fix would i get a new wiring harness or is that a seperate wire all together and i just need to replace the one wire affecting vtec.
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Old 02-02-2013, 02:37 AM   #14
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Default Re: OBD2 to OBD1 conversion?

if you are really willing to convert the ov1 to ov2 that would really cost you a lot make sure your finances availability
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Old 02-02-2013, 04:15 AM   #15
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Default Re: OBD2 to OBD1 conversion?

Just fix the one wire
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Old 02-02-2013, 06:58 AM   #16
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Default Re: OBD2 to OBD1 conversion?

Quote:
Originally Posted by apexi_rsx
he can make a z6 pass emissions but he would have to run a y7 or y8 ecu and do the cfk trick or put a y7/8 oil pain and oil pump on for the crank sensor. then swap back to an obd1 ecu when ur done.

The engine has to be the same year or newer, or it is illegal. If I remember correctly, that is federal.

This came from the EPA.

For light-duty vehicles, installation of a light-duty engine into a
different light-duty vehicle by any person would be considered tampering
unless the resulting vehicle is identical (with regard to all emission
related parts, engine design parameters, and engine calibrations) to a
certified configuration of the same or newer model year as the vehicle
chassis, or if there is a reasonable basis for knowing that emissions
are not adversely affected as described in Memo 1A. The appropriate
source for technical information regarding the certified configuration
of a vehicle of a particular model year is the vehicle manufacturer.


That is true in california where they are strict. In delaware i get away with running a full z6 motor in my 97 civic. as long as the CEL is off and your using a obd2a ecu the scanner will work at the port. It may be federal law but many laws are not enforced well at the state level. Im sure my car is not very desireable to anyone in Cali. lol
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