THE OBD1.5 to OBD1 Conversion Thread

[SappySE107]

It was the 5 volt reference that goes to the MAP and TPS. I don't know what the fix would have been but I know that is what the issue was for Brad when he was here.

[robertisaar]

Well that's a bummer... I mean awesome! Drive it around and see how it shifts! (unless you gotta tune for the shift points still.

lack of insurance, and a bad habit of getting pulled over are the only things preventing that... that and there is gas in the tank from i think late december... but if its any consolation, 1st and Reverse are awesome...

i'm off to go post this on w-body... and for anybody that knows of any other platform specific sites, feel free to distribute it there as well(for now i would make a link to here, since i still have to polish up the guide a little, but its damn near RTM...)

[robertisaar]

brad, thanks for idea and initial testing from whenever you did, but i think i'm going to steal whatever thunder this has...

[IsaacHayes]

Well that's a bummer... I mean awesome! Drive it around and see how it shifts! (unless you gotta tune for the shift points still.

[bszopi]

Well, from somewhere in here, Ben mentioned that it was actually the TPS that was the issue, not the MAP. I was just a bystander when doing the tuning - Ben was doing all the logging and investigating while I just drove around.

But glad to hear it is working!

[robertisaar]

i'll just say it:

IT WORKS PERFECTLY

and its one hell of a relief...

brad is it possible that the issues you were having with the MAP were due to elevation/weather or something? mine are spot on...

[robertisaar]

since y'all aren't on the forums at the moment, i'll let you interpret this:

you tell me what i already know...

EDIT: this is using the AWMJ PROM that i got with the PCM. considering that its meant for a LQ1 its pretty spot on for fuel.

EDIT#2: and it set a VSS code, but i think i know why: occasionally when i revved the shit out of it in park with the 1.5PCM, the speedo would move. not sure as to why but it would. going through the log i noticed it at the same time the code was set, so its nothing to worry about, adapter wise. and i don't have insurance on it so i moved it back and forth in the yard a little, seems to shift into reverse and first butter-smooth, havent gotten to the other gears yet, but i will soon. and i'm not sure whats up with the TPS. before i started revving it, it was a perfect zero%, then after i did, it switched between 0 and .39%... might have a sensor going out... but it good enough for now.

[robertisaar]

well everyone i have some news...

i left to go get groceries with my wife, and when i got home, there was a fed-ex box on the porch...

i know some out there are anxious.... whos going to be the one that asks???

[robertisaar]

i don't know...the parts are fairly cheap, but assembling it is a real pain in the ass and takes forever. it took me a little over 8 hours to crimp, solder and double check EVERYTHING. that includes maybe 20 minutes for lunch...

[95SleeperAcheiva]

rob, if this works out... how much you going to sell them for? I'm almost willing to buy one now even without you testing it!

[robertisaar]

so alldata made a typo? or you haven't checked it yet?

[bszopi]

I have my old 94 Beretta FSM, so I can verify the A15 pin.

[robertisaar]

FINALLY: PSG shipped the missing piece today, should be here tommorow or the day after, and this project will be complete, barring any unforseen issues... i'll update as soon as it gets here and on the car, i'll even take a screenshot of TP with it Datalogging.

[95SleeperAcheiva]

well, i can tell you my obd2 + drivetrain in a obd1 car.....

the key in ignition beep works.
um... oh ya! the doom light works!

i'm going back over it when i get a chance, but i got a good feeling I'm going to wire things light fuel pump and starter the old fashion way and by-pass the comp. Comp will figure things out when the motor starts spinning right?

[ForcedFirebird]

Awesome!

Thanks.

Now I can x-reference that with my '7730 pinouts and make some judgments.

I plan on starting the '93 OBD1 to '7730 swap this weekend.