Making an OBD2 SR20?

[98s14inaz]

I've discussed this with several people after my last emissions test in Arizona. I have an obdII s14 and failed emissions the first time through because the computer wouldn't communicate with my car. I made them retest it because the check engine light functioned the way it should. I passed. The funny part was that they never opened my hood or looked at anything.

This got me thinking. I've owned three of these cars, there are only a few sensors that the obdII system reads. Why couldn't you run two ecu's. One manages the engine and other important stuff, the other simulates the obdII crap via resistors. As long as it has the correct values, makes the cel function correctly, and communicates with the obdII plug, then it should work.

[g6civcx]

Originally Posted by 98s14inaz

This got me thinking. I've owned three of these cars, there are only a few sensors that the obdII system reads. Why couldn't you run two ecu's. One manages the engine and other important stuff, the other simulates the obdII crap via resistors. As long as it has the correct values, makes the cel function correctly, and communicates with the obdII plug, then it should work.

This is more complicated than it sounds. Try it and see.

[98s14inaz]

Originally Posted by g6civcx

This is more complicated than it sounds. Try it and see.

It is a theory and I realize it is a lot of work. I've done wiring and engines for years. The real challenge for me is finding time to work on it. When I do, I'll make sure to document it. I am just throwing the idea out there.