OBD-II pinout

[nightfire]

Does anyone have the OBD-II KL-08 ECU pinout?

Alternatively, does anyone make an MS-II -> KL-08/OBD-II harness?

If not, is there a good source for connectors if I need to run a new harness, or do I just reuse the old sensor connectors?

[Daninski]

I was going to go to the dealship and get a printout of the OBD1 wiring colour code and OBD2 wiring colour code then simply get an OBD1 plug from a junked MX3, pin the end of each wire on the OBD1 plug, plug them into their respective OBD2 harness positions and then spray a release agent (incase you'd like to unplug it and pour an epoxy type compound into the OBD2 harness to secure the pins. Now you have your own OBD2 into a OBD1 harness adapter. A lot easier I think than ripping out and replacing an entire harness. You need to hurry up. I'm waiting for your to finish before I decide how to do my 96 KLZE.

[Daninski]

Boomslang.us makes OBD2 and OBD1 harness cross overs but mainly for Honda. The guy said they might be able to make one for an MX3 if I supplied him the schematics.

[JoshVK]

i like the idea of an adapter..
Im hoping to swap mine in next few weeks..
car can run on OBDII ecu but i want to add a probinator chip..
so guess ill have to swap harnesses

[nightfire]

Damn... if I had the pinouts I could make an adapter cable in an hour.

[JoshVK]

me too...
ill donate if someone can find it....

[RS_OBD'oh_2]

Have you guys looked into 96 626 or something like it? I'm just asking because when I went through my issues with the RS it was VERY similar to the obd2 miata. The ecu pin outs might be the same even if the engine and ecu are different. I made my own diagrams by pulling the plugs and recording wire colours and positions, then comparing them to other models. As it turns out, the colours were totally different but the positions were damn near exact.

[96mx-3]

is this an adapter for obd II cars to run obd I ecus?

[nightfire]

is this an adapter for obd II cars to run obd I ecus?

Exactly. Or, possibly, an adapter to plug an OBD-II vehicle harness into a megasquirt, to be able to drop the original computer back in at any point.

[Daninski]

I have the OBD1 plugs (3) with about 6' of wire on them if anyone wants to make an adapter.
Just shipping and my time to ,,,'liberate' them from the Wreckers.

[JoshVK]

bump. haha
i just looked for this thread and couldent see it so made one similar. but yeah. Really want this adapter.

[Daninski]

Like I said Boomslang.us makes them for Hondas (go figure) but not Mazda. One of the things I thought was to to to each sensor and check the wire colour. I haven't made it to the dealer yet but eventually I will. I plan to see how a ZE works in a 96 with just a VAF and FPR installed. I'm doing the swap right now but probably won't be done for about three weeks (got kids and busy job). I'm wrecking a 92 so I'll probably remove the harness from that vehicle and that'll show me how difficult a harness swap might be.

[mazdasly75]

is you ECU's number is K853? I do have the pinout of this, but it's only on a sheet.

Let the connector like that and just pass new wires inside of ECU. You'll have an external connector for the MS and that's the cleanest job you can do. No extra wires in engine bay, just hack new signal through leg of OBD2 connectors and runs through wires that you don't need anymore, like:
-FPR solenoïd, use this one to control the fan solenoïd. You also have a 12V wire to feed solenoïd
-all O² signal wire, since you'r running wideband, that will just throw another code to the ECU without side effect. That will give you 4 connectors. Mainly you got 4 shielded wires to pass new signal inside.
-running ZE? so you got 3 connectors left inside the engine bay. Use it for coil pack system.

Don't forget to cut the engine cell leg

[nightfire]

Salut mazdasly75..

That's an impressive setup you've got in your .sig.. is that the lower compression de or a ze?

On topic, if I were going to the trouble of a standalone, I'd probably replace the wiring harness with fresh wire anyway to eliminate any chance of bad connections. Looks nicer anyway.

[mazdasly75]

why do you need a new engine harness??