diy ODB0>ODB1 ecu harness help.

[t-888]

1990 integra da9 GS b18a1.with PR4-A11(ODB1) ecu.

my dash had been leaking into the passenger floor. I decided to check on my ecu. The previous owners diy od0-odb1 wire job was a rats nest that was to short. Planing to extend the plug wires i cut it out. Printed out all the diagrams/pin outs i could find. But i cant find a good odb0>pr4 odb1 guide.


and I'm at a loss with some wire colors. One guide will say yellow wire.but my harness has a yellow wire with red dots.and one with silver dots.Not stripe just dots.Then there's the red/white 1 and red/white 2.tw sensor v.s.PA sensor same with blue 1 blue 2. Ones fast idle,ones alternator. But i have no clue which is which.My multimeter crapped out about a week ago so probings out.


if anyone could point me in the right direction. I would be more than grateful.

 

[t-888]

No one has any experience fixing a cut harness?

Well I'm picking up a new multimeter this week. You guys have any tips to save me any unneeded headaches.

 

[Muckman]

It would be easier to put it back to stock OBD0 pin out and then buy a conversion harness. That way you always have a known good fall back option.

 

[t-888]

I don't have the ODB0 plugs or ecu. The car ran before.just the harness was to short. Putting stress on the ecu plugs. I have the pin outs for ODB0 connector and pin out for ODB1. I don't have a problem when it comes to the plugs themselves. Just having trouble identifying a few wires


Going back to ODB0 wouldn't help me.. I would have the same problem. having wires that look exactly the same. But two different functions. EX. two yellow wires with black stripe and silver dots.

but thank for trying to help.