ECU swap: OBD2 for OBD1?
 

Has anyone thought of doing this? Would it be plug and play, or is the wiring harness/connectors different for OBD2? I'd like to run an ECUtune Stage 1 chip in a '96, but of course it's not made for OBD2. Could I swap my ECU for a pre-96, I wonder?

Re: ECU swap: OBD2 for OBD1?
 

change the TCU as well.. It can be done.

Tom

Re: ECU swap: OBD2 for OBD1?
 

what about the other way around?

Re: ECU swap: OBD2 for OBD1?
 

No, there were additions to the OBDII systems that the OBDI's do not have. BUT everything from an OBDI system is and should be present in an OBDII

Tom

Re: ECU swap: OBD2 for OBD1?
 

Do you need to swap the TCU when swapping a OBDII engine and tranny into a OBDI car. My OBDII tranny shifts smooth as butter in my OBDI car. Just thought Id ask

Re: ECU swap: OBD2 for OBD1?
 

No because you are using an OBDI ECU... There is communications beyond the OBDI standards between the OBDII ECU and TCU. If you change one, it is suggested you change the other as well.

Tom

Re: ECU swap: OBD2 for OBD1?
 

What about inspections? The ECU will probably have to be swapped back to OBD-II right? (My '92 cares not; I'm just in on this one for the tech.)

Re: ECU swap: OBD2 for OBD1?
 

TomsSVX replied to me privately and told me the OBDI/OBDII wiring/connectors were different. Can anyone confirm? I trust his expertise, but I'd love him to be wrong in this case.

Re: ECU swap: OBD2 for OBD1?
 

The OBDI- harness is comprised of 4 seperate plugs. The OBDII harness is one single plug... There must be a jumper harness made.

Rob, yes you would need to jump back to OBDII ECU's for inspection considering most scan the ECU through the diagnostic ports... Which will not be functioning w/ an OBDI ECU

Tom

Re: ECU swap: OBD2 for OBD1?
 

Does anybody have a good photo of an OBD2 SVX ECU with the lid off.

Re: ECU swap: OBD2 for OBD1?
 

I kinda figured that the diagnostic port wouldn't be there ;) but I wasn't sure if there was a year that inspections instituted connecting to OBD-II, or if it was all OBD-II cars.

Re: ECU swap: OBD2 for OBD1?
 

If I have an extra ECU ill open it up

Tom