obdo to obd1 conversion harness.
 

ZC I used this to build my own conversion harness. Unfortunately I am the one writing it lol. http://www.talkjdm.com/showthread.ph...217#post128217 and it is working ZC but I keep getting a code 4 ckp so I switched the input and ground around same thing code 4. I double checked my wire diagram and is all look good to me (using honda etms ).


Why am I getting a code 4? The dizzy works just fine on my obdo ecu. I know the obd1 ecu is good too. So it in my wireing. Has any one had luck making there own harness?

Re: obdo to obd1 conversion harness.
 

OBD1 and OBD0 distributors are not compatible.

Re: obdo to obd1 conversion harness.
 

----. What is different? number of teeth? Wave form? Can I retro fit a new sensor or distributor shaft in?

Re: obdo to obd1 conversion harness.
 

16 vs 24 tooth CKP sensor.

Any 92-00 distributor that bolts to your head will work. There's no way to fiddle the existing distributor, sorry.

Re: obdo to obd1 conversion harness.
 

That’s all write thanks for your help. At least I can stop pulling out my hair LOL. Ran ok just the code 4. So I am getting some were.

Re: obdo to obd1 conversion harness.
 

Yah, TDC and CYP alignment is the same, but the timing is locked because the ECU sees a conflict between TDC and CKP.

Re: obdo to obd1 conversion harness.
 

intersting.. more enlightenment on this please i got code 9 (cyp) and car run fine in boost just really crappy between 11-0 vac

Re: obdo to obd1 conversion harness.
 

Your timing is locked, also.

The way the ECU deduces which distributor sensor code to throw DOES NOT always mean that sensor is faulty. You mostly see this when rewiring a different OBD distributor, or using an OBD0-1 conversion harness where the distributor is pinned to whatever the specific harness maker decided to pin it to that day. If your car has been running and then you pop a specific dsit sensor CEL then it is 90% likely that sensor/wiring/airgap is the problem.

CYP lets the ECU know when TDC on #1 cylinder occurs, and the ECU uses this to deduce sequential fuel injection (idle emissions). If it's not getting/not getting legible CYP information for whatever reason, it will also lock your timing. I wouldn't boost on that, you need to fix it.

Re: obdo to obd1 conversion harness.
 

Ok I have a distributor it fits in the distributor hole. No bolt holes line up so I will just make something to bolt it to. My question is there are 3 sensor. The one that has only one tooth do I alight this one with tdc #1 compression stroke rite? cyp is one tooth, tdc is 4 and ckp it a lot??

Re: obdo to obd1 conversion harness.
 

it did run just really crappy when it was cold (in vac up top close to boost..) i drove like that for almost a month (fuel millage was worse cuz i had to floor it more)
but i did fix it it was torn wire on my home made obd 1 conversion (chopped stock obd2 wires and spliced in obd1 pig tails) it broke cuz i had the ecu unbolted and it was dangling around on the wires for a few weeks :1 not it bolted like it should be..

Re: obdo to obd1 conversion harness.
 

Ok looked at another car and how the distributor was set up it. With the motor on tdc #1 compression stroke the cyp and cyp sensor did not line up. The tdc and tdc sensor did and every 180* of rotation at the crank another tooth lined up on the tdc. What the hell dose the cyp reference off of? I seams to be in the middle of a stroke??

Should I just put the distributor on and rotate the ---- out of it till it runs good. I will have to change the wire and plug location for 90* of distributor housing rotation to keep the firing order 1342.

The motor is a b18a1 and I think the distributor is a d non vtec it is stamped with p06. Any one using this set up? I can only get 1/2 bolt holes lined up. It is running at the moment but like ---- #1 and #4 are not firing. I think it is due to injector firing order is mest up due to my distributor problem. I can remove plug wires #1 and #4 and this makes no different car still runs/bad.

I can always stick obdo. I want to up grade. Car runs fine with obdo. O by the way no more codes with the distributor swap. I am running a obd1 pr4 and a 4 wire o2 sensor.

Please some one help. I think I am write on top of it. Should I find and obd1 b18a1 distributor? Or with this p06 distributor work?

Re: obdo to obd1 conversion harness.
 

Nice I got it just rotated the distributor around and it works/changing the wires around every 90* of distributor rotation. Set base timing good to go. I still have no idea what the cyp is looking for but it is defiantly not any tdc or bdc on the motor. Got 1 bolt in ftw.