Ok 89 civic lx I converted to mpfi and obd1 at the same time I ran the injector wires and the 2 new dist wires wired them to a obd1 dist I am using civic ex plugs and inj without a resistor box the 4 wires that go to the resister box on obd0 are soldered together and ran to a15 on the ecu plug. The problem I am having is I am getting codes 10 and 16 on the p06 ecu wich is iat sensor and injectors. I am getting spark but no fuel I have tried different inj and inj clips can some one help I checked all my connections and they seem to b solid. I need some help.

 

Someone has to have some ideas. Anything helps guys

 

every 88-91 civic i've ever had, be it stock, not stock, or swapped, threw the IAT code

 

Well I could cate less about the iat the main thing is I'm not getting fuel and I'm throwin a code 16= injectors and I need to know why iys throwing that code

 

ummm how did you wire the injectors?

 

Umm crap I kinda don't remember but I'm pretty sure I ran four wires from the ecu plug a1-a3-a5-a7 and in that order I ran each wire to on injected from the one closest to the dist to the right.
a1__a3__a5__a7
(dist) inj1_inj2_inj3_inj4 (cam gear)

the number of the pin is above the injector that I wired it to
then I ran the other 4 wires and soldered them together along with a wire running to the ecu plug a15

 

Did you depin (or cut/splice) and use OBD1 ECU plugs or did you use a conversion harness? This may be a source of error considering the wires are not located in the same slots between pre OBD and OBD1 ecu's.

According to what you stated above, your injectors are backwards. FYI the front side of any motor is the timing belt side so that's where you start (#1 injector is closest to the timing belt and #4 injector is closest to the distributor on our car).

 

I am using a obd1 conversion harness and as for the mpfi swap I fallowed instructions to the t. I ran new inj wires straight from the plug I to the engine bay but would it matter if the injectors are mixed up? It might not run that way but it shouldn't throw a code

 

No it wouldn't throw a code [I don't think] but definitely wouldn't run. As for soldering the other ends together, that is correct but where did you find that they are supposed to run to A15? I am looking at the wire diagrams in the FSM and ECU pinouts online and both say A15 is ACC-AC compressor clutch. Is that A15 on the conversion harness aka the P06 or A15 on the pre OBD plugs?

 

A15 on the original obd0 plug the only wireing I had to do for the obd1 conv is the distributor I have a jumper harnes for the ecu it says it's plug and play

 

Can you verify where the A15 wire on the pre OBD side of the harness goes to on the OBD1 side?

 

24ten I think I fallow what ur saying or thinking I'll go check right now and also I hooked up my obd0 HD crx ecu without the obd1 conv harness ofcourse just to see what would happen and I got codes 8 and 10 but no inj code so I think u might be on to something I'll repost in ten min with an answere to the a15 question

 

According to the 92-95 Civic FSM the injector wires are yellow/black (color doesn't matter but just in case you're following along in the FSM) and goes to #3 of the main relay AND A25/B1 (A25-IGP1 and B1-IGP2, they just connect to one another and go out). If you're feeling confident, try splicing the soldered end of the injector wiring into A25 OBD1 side.

 

Ok just discover that where a15 would go on the conv harness well there no pin there it's empty so it's not connected. What should I do I imagine that's why I am getting the code 16

 

Trying sticking a wire in there and splicing it into A25 (or jumper wire basically)...

 

Ok so what I need to know is where would I solder the wire from a15 to on the obd1 plug that goes into the ecu??

 

K so run the a15 wire to a25 on the obd1 plug?

 

Yes.

 

I just looked into the FAQ and there's a link with pre OBD to OBD1 pinouts, pre OBD pin A15 should go to OBD1 pin B1. IF A25 doesn't do anything for you, try splicing into B1.

 

Omg dude thanks for all the help I'll try it first thing in the mornin if my car started it would wake the whole block lol open downpipe I hope it works but as for the injector wireing what wire goes to what injector for ex. A1 goes to 1 a3 goes to 2 so on and so forth

 

Should I try splicing into b1 first since the FAQ is saying that's where it should go I really only wanna do this once lol

 

For the pre OBD side, you had it right A1-Inj1, A3-Inj2, A5-Inj3, and A7-Inj4 but make sure you switch the injectors around, #1 is closest to the timing belt so you'll have to move some wires around. For the OBD1 side, it's A1-Inj1, A3-Inj2, A5-Inj3, A2-Inj4. SO they should go straight across on the conversion harness with the exception of Inj4. The link in the FAQ also confirms this.

Hope everything works out, I'll check in tomorrow.

EDIT-Even though according to the wiring diagram A25 and B1 link together, I'd go off of B1 first since it's in the FAQ. Technically speaking it shouldn't matter but yeah, try B1 first.

 

Also the iat sensor plug there are two wires where do those two wires go on the obd0 ecu plug??

 

Did a lil test buy stuffing the wire into the b1 slot and the code 16 is gone yay now I just need to know where the iat wires go to on the ecu

 

Hey thank u sooooo much 24TEN it started right up this mornin now I can put the finishing touches on it and have my dd back. Once again thanks for all your help.