JDMRice

My buddy wants to switch to obd1 anyways so hes getting an obd1 motor, and obd2-obd1 harness , Will rewiring the dizzy, and changing the injector clips work(sodering) how involved is this? or does he have to get an obd2 dizzy? I did a bit of searching got 3 pages, but couldnt find anything concrete.

JDMRice

found this now reading this has answerd most questions, except one is it possible to keep the obd1 alternator?
"If you want to use an OBD1 B16A engine in an OBD2 equipped vehicle (such as yours), then you'll have to:

1) Reuse your existing OBD2 engine harness and add the respective VTEC wiring and Knock sensor if you own a non-vtec 96-00 civic...OR... find a 96-98 EX engine harness which already has the vtec wiring & knock sensor embedded into it.

2) Find a set of B-series OBD2 injectors...OR... or cut & splice the OBD1 injector plugs and adapt them to your OBD2 engine harness.

3) Find a 96-00/OBD2 B-series alternator ...OR... sell/trade the OBD1 B-series alternator for a 96-00/OBD2 B-series alternator. The plug is a square type on the 96-00 alternators and has 1-2 more wires leading to it, whereas the OBD1 alternator plug is a bigger round plug and has less wiring going to it. So there might be an issue if you try to rewire it...your best off fnding an OBD2 B-series alternator though.

4) Find a 96-98/OBD2 B-series distributor which will plug n' play w/your DX engine harness....OR...they say you can convert your OBD2 distributor plug to OBD1 spec by repin it to a dual OBD1 plugs and will accept & utilize an OBD1 distributor. I've never done this myself and I find a big pain in the *** (I personally hate rewiring stuff)....I suggest you find a 96-98 B-series distributor to make life easy on yourself.

5) ECU.
If youd like to go OBD1 ecu, purchase a 96-98/OBD2-->OBD1 ecu jumper and simply use an OBD1 ecu. JDM OBD2 ecu's programming is similiar to OBD1 programming as far as looking at sensors. It looks at the same exact sensors an OBD1 ecu does.......but for the US version of OBD2 ecu's programming, they look for a few more sensors which makes OBD2 a hassle.
US OBD2 ecu's look for these additional sensors:
- CKP (an integrated crank sensor thats found & embedded on the oil pump)
- 2nd 02 sensor

The CKP sensor is the big downer, since OBD1 and JDM OBD2 engines do not have this sensor. If you want to add this sensor, you need to change your oil pump to a US spec 96+ B-series oil pump. Again, you can easily avoid all this frustration & wasted $$$ if you go with a JDM 96-98 ecu or the OBD1 route.

b16_DIM

I have a 97 dx (obd2) and just swapped in a JDM obd1 b16. I just rewired the obd1 dizzy and alternator. I know I got the dizzy correct so I can give you pin info on that if you want to keep your obd1 one, as far as the alternator my belts should arrive any day now, my chipped ecu by early next week. Then ill be able to check and see if my rewiring for that worked. The dizzy was pretty easy once we ID'd which wire was which, you have to solder the wires and some of the wires have shielding on them. If you have any soldering experience at all you can do this, I can give you tips on it if you haven't.

JDMRice

I got no problems with sodering etc... For the dizzy did u jsut match the colors? yeah if u could give the pin info it be great help, and let me know how the alternator goes.

Thanks

b16_DIM

I wish I could have color matched, the obd1 used a different set of colors. Ill get pin info for you some time this weekend, probably around sunday.

EFvtec Yo!

You can also use the stock EX injectors if you dont want to cut the harness and solder in clips. I heard they flow the same the only difference is the clips. I was also able to use my D series alternator by just getting a smaller belt. I used a 30 inch 4 groove belt.

Ej6B20

I reused my d-series injectors on my b16a and I have no problems. You can keep the obd1 alternator but you'll have to rewire your obd2 harness with an obd1 plug .. I would just get an obd2 alternator

b16_DIM

Okay I got some info for you on the Dizzy. My obd2 harness had the following colors which we matched up to pins on the obd1 dizzy plug. I started top to bottom right to left looking at the backside of the plug. Remember right to left not left to right.
Wire one on the plug should go to the yellow obd2 wire,
2 Green
3 Blue
4. Yellow/Green stripe
5. Black
6. Red
7. White
the last spot should be empty. I took a few photos so ill upload them as soon as I get them off the camera. Let me know if you have any problems. I recommend first splicing the wires with quick connects or wire nuts, running the car , check your codes, then solder them.