Blue Hybrid

Hi, there are alot of these charts floating around, but i found they are all wrong. I sat down and figured it out with a friend, made my own harness, and it all works fine.

edit: let me check my harness again, then ill repost

Non OBD-OBD1 conversion
PR3 P30
A01 A01
A02 A23
A03 A03
A04 A24
A05 A05
A06 OPEN (A20?)
A07 A02
A08 A04
A09 OPEN
A10 A20
A11 A09
A12 A07
A13 A25
A14 A07
A15 B1
A16 A26
A17 OPEN
A18 B2

B01 D01
B02 OPEN
B03 A15
B04 A12
B05 D06
B06 A13
B07 OPEN
B08 B05
B09 OPEN
B10 B11
B11 OPEN
B12 B12
B13 B09
B14 A16
B15 A21
B16 B10
B17 A21
B18 OPEN
B19 D03
B20 D04

C01 B15
C02 B16
C03 B13
C04 B14
C05 D15
C06 D13
C07 D11
C08 D14
C09 B08?
C10 D02
C11 D17
C12 D22
C13 D20
C14 D21
C15 D19
C16 D14


Modified by gold EF at 12:42 AM 2/5/2006


Modified by gold EF at 12:46 AM 2/5/2006


Modified by gold EF at 12:46 AM 2/5/2006

HondaPartsHero

While we are on topic can someone confirm this diagram for OBD0-OBD1 dizzy. The plugs in the pic are as you were looking at the backside where the wires come out as if you were making a conversion plug.

HondaPartsHero

hello, mcfly?

VtecSyndrome

"McFly" has left the building...ha ha. you know I have this harness already and you live down the street from me? I could solve this real quick for you but i'm not going outside now since it's 2:18am, hit me up man.

143MYVTECEF

So if you repin your connectors you can run a OBD-1 ecu on a OBD 0 car?? Sorry new to this...

HondaPartsHero

Doh! I keep forgetting that, well PM me your number so we can get up like real soon.

VtecSyndrome

pmd

Blue Hybrid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 143MYVTECEF &raquo;</TD></TR><TR><TD CLASS="quote">So if you repin your connectors you can run a OBD-1 ecu on a OBD 0 car?? Sorry new to this...</TD></TR></TABLE>

no, you have to make a jumper harness, basically you have to cut the male harness off a obd1 car from the junkyard, and unsolder the female harness part from an older obd0 computer, then match the jumpers to the chart, and you can now plug in the obd1 computer to your obd0 harness

VtecSyndrome

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

unsolder the female harness part from an older obd0 computer</TD></TR></TABLE>

yeah, that part was real fun considering I did not have the right tools for smooth removal

Blue Hybrid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VtecSyndrome &raquo;</TD></TR><TR><TD CLASS="quote">yeah, that part was real fun considering I did not have the right tools for smooth removal </TD></TR></TABLE>

i used a butane torch, took about 10 seconds each

143MYVTECEF

What are the benifits of running a OBD1 computer on a OBD0 Car?

Blue Hybrid

depends on wich obd1 ecu you use, the most popular one is the p28

it has the least amount of sensors and has vtec. obd1 computers are far faster at calculating air fuel ratio than obd0, obd2 cannot be easily modified, thus obd1 is the best choice. just by upgrading to obd1, an engine can gain 10 hp

CR-V-tech

hey gold ef I have an 88 hatch dx, I had the engine harness converted to obd1 mpfi by hasport, then I bought a boomslang obdo to obd1 jumper harness, and now nothing is pinned the same the engine harness wires don't match the harness that goes into the car and when I call hasport they say that boomslang's harness is pinned differently than the way that they do so then I call booomslang they tell me that all I have to do is repin 4 wires that go to the dizzy ckpp, ckpg, cypp, and cypg. this is just a big f-ing hassle and is really starting to **** me off. do u have any ideas, I already repinned the 4 wires like they said and still no spark! I just want to burn the car to the ground, fuel pump doesnt come on and i have no spark, and also my injectors aren't firing either. the car cranks and almost all of the other electronics work. I am so f-ing confused. Oh and I also tried to use the factory wiring diagrams and that doesnt help at all, the obd0 ecu connectors are pinned for a dx, but the engine is mpfi and obd1, I mean i'm a fairly skilled individual but if these companies are goin to make this **** u would think that they would all try to be on the same page! hit me back man please

vtecn8ive

I am going to have to so DON'T use this conversion harness pinout. Did you see how many repeats you have. You are seriously using this? Does the car run?

Curious why you used a pr3 (which is already for vtec JDM) and pinned it out against a p30 (which is vtec JDM too)?

Most of us use pm6 pinouts a lot more common.

here is a link I have used multiple times. In fact I was one of the first guys on that thread to make mine. Still going strong too.

https://honda-tech.com/zero...age=1


Sorry not trying to rip on you but I think some of your pinouts need to be double checked.

-Shane

VtecSyndrome

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CR-V-tech &raquo;</TD></TR><TR><TD CLASS="quote">hey gold ef I have an 88 hatch dx, I had the engine harness converted to obd1 mpfi by hasport, then I bought a boomslang obdo to obd1 jumper harness, and now nothing is pinned the same the engine harness wires don't match the harness that goes into the car and when I call hasport they say that boomslang's harness is pinned differently than the way that they do so then I call booomslang they tell me that all I have to do is repin 4 wires that go to the dizzy ckpp, ckpg, cypp, and cypg. this is just a big f-ing hassle and is really starting to **** me off. do u have any ideas, I already repinned the 4 wires like they said and still no spark! I just want to burn the car to the ground, fuel pump doesnt come on and i have no spark, and also my injectors aren't firing either. the car cranks and almost all of the other electronics work. I am so f-ing confused. Oh and I also tried to use the factory wiring diagrams and that doesnt help at all, the obd0 ecu connectors are pinned for a dx, but the engine is mpfi and obd1, I mean i'm a fairly skilled individual but if these companies are goin to make this **** u would think that they would all try to be on the same page! hit me back man please </TD></TR></TABLE>

My budddy had the EXACT same problem and he swore up and down that everything was wired right. Well it was but the problem he had was B10 and B12 were not pushed in the right way, when he repinned them he had them upside down which in turn prevented them from making proper connection when the harness was plugged into the ECU. I repinned them correctly and it fired right up! and since it was his first time doing a wire job like that he did not think of that possibility. maybe your lucky enough to have this same problem.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 143MYVTECEF &raquo;</TD></TR><TR><TD CLASS="quote">What are the benifits of running a OBD1 computer on a OBD0 Car? </TD></TR></TABLE>

I was used to OBD 1 Vtec because I had my motor in a '95 EG and a '92 GSR before the REX and when i first drove the rex I had it on OBD O that being the only difference between my other cars prior. It was slow as hell feeling and it bogged badly when Vtec engaged, it also had a speed limiter of 112 which I hit pretty quick. I learned about the diff between OBD 1 and converted using a JDM PR3 ECU from an XSi and a Rywire harness and DAMN it felt like my old motor again! I definetely felt like a 10hp gain or close to it so I now hate OBD 0, you can chip the OBD 0 ECu but why do that when it runs soo good off a stock ECU from OBD 1??? it was a no brainer for me.

Blue Hybrid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecn8ive &raquo;</TD></TR><TR><TD CLASS="quote">I am going to have to so DON'T use this conversion harness pinout. Did you see how many repeats you have. You are seriously using this? Does the car run?

Curious why you used a pr3 (which is already for vtec JDM) and pinned it out against a p30 (which is vtec JDM too)?

Most of us use pm6 pinouts a lot more common.

here is a link I have used multiple times. In fact I was one of the first guys on that thread to make mine. Still going strong too.

https://honda-tech.com/zero...age=1


Sorry not trying to rip on you but I think some of your pinouts need to be double checked.

-Shane</TD></TR></TABLE>

do more research before you knock it

pm6 is usdm si, cross it with pr3 or pw0, b16a jdm, they are almost identical, then do the same with p28 and p30. both identical pinouts

the repeats are powers and grounds. the obd1 ecu requres more powers and grounds than the obd0 one, thats why you have to use some of them. and if you read the original post, i made this harness, exactly the way it is, and it works

so

Blue Hybrid

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CR-V-tech &raquo;</TD></TR><TR><TD CLASS="quote">hey gold ef I have an 88 hatch dx, I had the engine harness converted to obd1 mpfi by hasport, then I bought a boomslang obdo to obd1 jumper harness, and now nothing is pinned the same the engine harness wires don't match the harness that goes into the car and when I call hasport they say that boomslang's harness is pinned differently than the way that they do so then I call booomslang they tell me that all I have to do is repin 4 wires that go to the dizzy ckpp, ckpg, cypp, and cypg. this is just a big f-ing hassle and is really starting to **** me off. do u have any ideas, I already repinned the 4 wires like they said and still no spark! I just want to burn the car to the ground, fuel pump doesnt come on and i have no spark, and also my injectors aren't firing either. the car cranks and almost all of the other electronics work. I am so f-ing confused. Oh and I also tried to use the factory wiring diagrams and that doesnt help at all, the obd0 ecu connectors are pinned for a dx, but the engine is mpfi and obd1, I mean i'm a fairly skilled individual but if these companies are goin to make this **** u would think that they would all try to be on the same page! hit me back man please </TD></TR></TABLE>

i dont mean to be a smart ***, but id say either get a new harness, or go thru yours wire by wire

VtecSyndrome

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

i dont mean to be a smart ***, but id say either get a new harness, or go thru yours wire by wire</TD></TR></TABLE>

Could be right, I have not checked mine yet but in a week or so I will start going through it so I can make a replica since i already have what I need. As soon as I get my list together I will post it because it works for sure in my car!

143MYVTECEF

Ok sweet but what else is needed besides the ecu and jumper cables inorder to make this work proberly?? And whats that best ecu to run??

K20EF8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPartsHero &raquo;</TD></TR><TR><TD CLASS="quote">While we are on topic can someone confirm this diagram for OBD0-OBD1 dizzy. The plugs in the pic are as you were looking at the backside where the wires come out as if you were making a conversion plug.

</TD></TR></TABLE>
That is correct, however I believe the plug is upside down

HondaPartsHero

I was looking at them like this

CR-V-tech

THE CAR IS STOCK, WITH AN LS MOTOR, hasport did the engine harness, then all i did was add the 4 wires at the ecu plugs, 2 for the dizzy, and 2 for the injectors, other than that the pin placement for the ecu is the stock dx wiring!!!!! but i had to pull two wires out to install 2 of the new ones and hasport just says to tape them up or heat shrink which i did, then i called boomslang they said that all i have to do is repin 4 wires and all is ok but that isn't right, cuz last night i was checkin the wires at the dizzy and the there are two orange and two white wires for the crank pos sensor,when there should only be 2 and the two that are wired in for the hasport conversion aren't even on the right pin locations for the two on the dizzy's connector ! oh and FYI, i am running an obd1 pr4 ecu hooked up to the boomslang jumper harness connected to the stock dx ecu plugs w/the exception of the four wires that i added for the hasport harness, and then the hasport converted obd1 engine harness! so if u have any valuable info i would appreciate it

CR-V-tech

bump

VtecSyndrome

You need to check to wiring anyway, that's all you messed w/ so that has to be the problem. I can't find my diagrams right now but I had this problem a few weeks ago, you need to be concerned with B10, B12 and also C1 and C3 (I think but can't remember the C section too well) the 2 wires you pull out of the Harness need to wire back into the dizzy, you will see what I mean if you look up the conversion diagram and really follow it closly..

My buddy wanted to burn his car to the ground becuase he was overconfident and swore the wires were good but in the same case all he messed with were wires so thathad to be his problem, we went through it again and found the problem, I now it sucks but that has to be where your problem is. Don't let it get you down too much becuase when you get it running you will most likely want to kick yourself due to how easy it ended up being.

vtecn8ive

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

do more research before you knock it

pm6 is usdm si, cross it with pr3 or pw0, b16a jdm, they are almost identical, then do the same with p28 and p30. both identical pinouts

the repeats are powers and grounds. the obd1 ecu requres more powers and grounds than the obd0 one, thats why you have to use some of them. and if you read the original post, i made this harness, exactly the way it is, and it works

so </TD></TR></TABLE>

As I stated pm6 is not the same as a pr3.

For example the **** that is wrong:

A04 needs to go to the engine bay for Vtec solenoid. This is where a subharness comes in play so you can convert to obd1 oxygen sensor, and vtec, knock.

B08 is for Powersteering. Why would you hook this up? I guess unless you are running this harness in a 90-91 Integra or have converted your CRX to power steering it will benefit you.

D03 is for Knock Sensor and you have it hooked up to the ELD (b19)? why?

D06 is for vtec oil pressure switch and you have it hooked up to B05 which is clearly not for it.

D14 is for the oxygen sensor and you have it hooked up to C08 which is EGR VLS. The EGR VLS pinout is D12 (for your info)


Oh yeah is your vtec working? Your not throwing a O2 Cel are you?

But good luck you guys. I'm off of this thread apparently there are like 3 different conversions going on in this thread that don't really relate to the Thread Topic.

Peace,
Shane