I was thinking of building a EFIE (electronic fuel injector enhancers and yes, I know I can buy them) for my H3. All the information I can find on the web states that the output ranges from .1 to .9 volts, with .45 being the "normal" point. Thinking that this has to be brain-dead to design, I wiped out my test equipment and found that the output is a sine type wave about .3hz which increases with speed. So, my assumption is that the average value of this wave must be .45v for the PCM to be fooled into thinking all is good.

Are there any auto experts out there that know if my assumption is correct?

If my assumptions are correct, I only need to generate a symmetrical square wave from .1 to .9, run it through a transformer to simulate the EFIE

 

I figured it out. No need to reply.

 

I know you said there is no need to reply, but what exactly are you trying to accomplish? I guess I dont know what an enhancer is or why you would want to trick the computer with a fake O2 sensor signal