I have a DLG dual wideband. Had one of the outputs connected to the O2 circuit of the MS. Everything was fine. That sensor eventually failed and was giving me an error so I switched the outputs to the other sensor into the MS. Ms was not reading when I switched the outputs, sometimes it was pegged all lean or all rich even though the wideband gauge showed stoic. I took out the MS and put the jimstim on it and at the daughterbord pin, the voltage is fixed regardless of what the jimstim puts out. I swapped the daughterboard to another one that is damaged but the O2 circuit is fine and that one showed the voltage changing with the jimstim. My question is if the O2 circuit is shot and I have no option put to buy another board. Thanks.

 

That is a very specific question, probably too specific for an RX7 forum. Have you tried asking the Megasquirt forum, or contacting whomever you bought your ECU from? If you have two daughterboards and the circuit work on one of those boards, someone who is good at reading schematics and soldering might be able to swap parts around to repair the circuit that's not working.

 

Thanks for the response. I asked in the megasquirt Facebook group, but got no response. I built the board myself so no one else to reach out to.

 

if you go to the Megasquirt page they have the board circuits i would replace the parts for the O2 circuit and see if that fix your problem.

 

The o2 circuit is pretty simple. I replaced both resistors and the capacitor, but same thing which is why I am leaning to the daughter board. I did find the wire from the o2 gauge into the relay board was a bit melted so something must have happened and that part of the daughterboard must have fried. I don't have the capacity to change the cpu itself so I guess I am stuck buying another daughterboard. Thanks for the response.