Dr.Boost

because nobody else does. Ok, here is my problem. I have a 94 Civic DX (non vtec) with a P06 ECM. I put a P28 ECM (vtec) in it and it throws a cel(well duh). Of course it is throwing the vtec pressure cel because I don't have vtec. I need to know what wire on the ECM monitors vtec pressure. I need to hack that wire so the ECM thinks it has pressure and stops throwing me these damn codes and leaning me out at 6 psi. That really pisses me off when I am at like 6000 rpm and my a/f guage disappears and the motor falls on its face. Please help me with any information you can. Either a site that might have the P28 ECM layout or a guy that has this same problem. I need anything....
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Kaneda13

as for the wire. look at the VAFC documentation, since it lists what wire to tap into to work the vtec. jsut a thought.

Dr.Boost

Good call you bastard :P I have been looking at the S-AFC instructions because I knew they had some of the ECM pinouts labeled. I didn't even think to check the V-AFC diagram. Thanks man. I hope I can actualy hack that thing to work with my non vtec. Has anybody ever put a P28 into there non vtec car? I thought it was a very common thing to do. I wonder how they got the ECM to think the vtec has pressure? I'm going to try a ground and see if that works since most senders use a ground as the source. I am hoping it isn't a variable positive voltage. That would require some stupid things to be done. Anyways, thanks for the help. I'll post what happens just incase someone else runs into this problem.
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leed

A thread halfway down the page w/ a P28 pinout....

https://www.homemadeturbo.com/forum/...;threadid=3537

Dr.Boost

I had already looked at that for about an hour and it just doesn't match up. I don't think that is a P28. It also does not show the vtps or any sign of vtec for that matter. Thanks for the help though......
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leed

Whats is vtps? Are you talking about Thottle position sensor voltage?

Looks P28ish to me. I see Vtec, mpfi, obd1, correct dist.....

Dr.Boost

Hehe, no I meant vtp sw I think. (vtec pressure switch. Maybe I am missing where it is listed on the P28 diagram, but I don't see it. It still doesn't match my P28. Hell, I don't know. This dude sold me this knowing my car was a non vtec and didn't bother to tell me it was going to be a mother ****** to rig it to work right.
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Tom-Guy

D6 will be VTM, the pressure switch. Since it's open now, might want to ground it?