Why can't we have THIS

[Artemis]

A harness to convert your OBD1 to work with OBD2 ECU. Plug and play. If someone could make these for us they could stand to make some money.

 

[slick]

IIRC, because many of the sensors between OBD1 and OBD2 are very different.

[Artemis]

IIRC, because many of the sensors between OBD1 and OBD2 are very different.

 

simple enough. OBD 1.5 blows.

[slick]

Now, from 1.5 to 2, you should be in better shape, but doubtful a pigtail harness would work for you.

[Brian P]

It would be doable, but there are a few hardware changes. I ended up making most alterations at the C100 connector to use the older interior harness.

 

Noone has the $$ for that anyway, plus the market will be extremely limited.

[Artemis]

I'd just like a process where I dont have to grab an entire wiring harness from another car, unhook mine and hook that one in along with some extra sensors.

[Brian P]

Well even if there was a plug made for us, you'd still have to:

 

- Run a new wire from the PCM, thru the firewall, to a new OBD2 port for the second data wire

- Add 12V constant power wire to the OBD2 port

- Run 3 wires from the PCM to a MAF sensor which you would have to purchase (3100 cars)

- Switch to the OBD2 linear EGR valve and matching exhaust tube and with that, the matching upper intake plenum, which for DOHC engines is a whole new can of worms

- change the wiring to the EGR (add 1 wire, reassign others, solder in the correct plug)

- Add wiring and have a bung welded for the OBD2 downstream O2 sensor

 

I might be missing something but that's the majority of it.

[Artemis]

Well even if there was a plug made for us, you'd still have to:

 

- Run a new wire from the PCM, thru the firewall, to a new OBD2 port for the second data wire

- Add 12V constant power wire to the OBD2 port

- Run 3 wires from the PCM to a MAF sensor which you would have to purchase (3100 cars)

- Switch to the OBD2 linear EGR valve and matching exhaust tube and with that, the matching upper intake plenum, which for DOHC engines is a whole new can of worms

- change the wiring to the EGR (add 1 wire, reassign others, solder in the correct plug)

- Add wiring and have a bung welded for the OBD2 downstream O2 sensor

 

I might be missing something but that's the majority of it.

 

Far too much work to be worth it. Does anyone ever downgrade to OBD 1?

[Brian P]

I've heard of it, but don't know anyone personally. You'll still have things to do regardless.

[jimmyfloyd]

Most places downgrading to OBD1 is illegal, and most places won't pass you for emissions.

 

That being said, most 96+ hondas/acuras that are turbo'd are running OBD1 using a conversion harness similar to that one (or possibly that one). They will run it modified, then when it comes time for inspection, they'll swap out the ECU and injectors, drive is carefully to get the proper number of cycles in, and then get it inspected.

 

Sucks for people in states that do inspections yearly (as in NY and why I've not turbo'd mine) and isn't so bad for those who do it less frequest (like IL, which is where my roommate who had done this was from, and who explained it to me)

 

Question though for you. What would the benefit be for you to update to OBD2 vs staying OBD1/1.5 where you are now?

[slick]

Tuneability.

[swift13]

to bounce off a minute in IL anything older then 95 no longer has to be ran on emissions.

 

I think.

[Artemis]

I dont see how anyone would know I downgraded to OBD1 especially since I'd be going from OBD1.5. Even emission test centers dont touch my computer. Does anyone know what would be involved?