Smogging with Megasquirt ECU

[woodenhead72]

Im just curious as to what the smog issues, if any, are going to be when i swap out my stock ecu with the Megasquirt ECU. I know some people on here are running this ECU so i was wondering what problems to look out for.

To be specific, i have a 97 Prizm(corolla), which has the OBD connector under the steering wheel that they usually plug into, will this still work for them?

[Flashmn]

Megasquirt doesnt have OBD. If it passes depends on the smog regulations in your area.

[woodenhead72]

Thats kinda what i figured, that it didnt recognize the OBD port. So would they just not smog it or would they go through the regular testing process like they do with cars without the OBD.

Anyone know the regulations for Portland by chance?

[Bitter]

if they do obd2 testing in your area then when the port doesnt work its an automatic fail. cars 96 and newer usually get either just obd2 or obd2 tests and the rolling dyno test.

[woodenhead72]

Originally Posted by Bitter

if they do obd2 testing in your area then when the port doesnt work its an automatic fail. cars 96 and newer usually get either just obd2 or obd2 tests and the rolling dyno test.

That blows, looks like i get to re-think my plans then .

i dont suppse theres any way to wire in the OBD....i know, im out on a limb here

[Bitter]

you just MIGHT be able to do something tricky here

it could be possible, tho a real wiring pain in the ass, to have the stock pcm and MS both there and just piggyback the stock pcm the signals from the sensors and use sims for the output responces its expecting. its probably just easier to register the car to an area that doesnt do smog checks however. i think its sort of stupid that even if a car will pass the sniffer test it fails because they cant poll the obd2.

[Piloter]

Allow me to chime in here, as I have to worry about WA smog with future Megasquirt...supposedly you can wire up MS in parallel with the stock ECU such that everything is still ECU controlled except fuel/spark. Almost like using it as a piggyback. This may involve duplicate sensor wiring for whatever sensors MS needs (O2, RPM, etc), but otherwise should leave OBD2 diags compliant.

www.sparkandfuel.com used to have a section detailing a little more about this, but it's buried and I don't have a lot of time to dig for it.