MSefi.com read only forum (Jan.15,2018)

I have MS2 on V3 board running 2.89 code. I am using a 14.7 NAW WBO2 that was working perfectly fine with megasquirt for a while. After my car stalled and I tried to start but the battery was too low it stopped updating the O2 value. I have re-flashed the ECU with 2.89, I have tried tunerstudio and Megatune. I know that the NAW is working properly because it goes though a warmup and it gives 1.2 volts, then 3.35 volts, then 5 volts. Using the key to turn on the electronics Megasquirt only displays the 1.2V data and will not update. If I unplug the DB27 and plug it back in megatune will freeze at the value that was displayed at the exact moment megasquirt came online again. This is rather frustrating as my fuel pump control line has gone dead as well in a similar situation before this.

Thank you in advance, this is a real hair puller for me.

After you re-flashed the 2.89 code did you remember to re-calibrate the wideband O2 sensor type in Megatune?

I think that's right. Just trying to help, though, and I could be wrong.

You know, go to the "Tools/Calibrate AFR table" in Megatune, choose the appropriate O2 sensor/controller, then click OK.

Yes, I did recalibrate the O2 sensor table. I have a sinking suspicion that my MS2 module is going south as I flashed it to 2.88 and then back to 2.89 and it started doing that with all the sensors. Powercycling and flashing again I was able to get it back to normal besides the O2. Are there any tests that I can run to make sure the module is OK, or any way to re-write the base firmware and not just the flash?

Thanks.

Are you getting a good RPM signal? The update rate is keyed to RPM and zero RPM = zero updating.

Yes, this is with the car not running. I have not tested it with the car running. Every other gauge is updating, so the O2 is the only one that does not update at 0 rpm?

That is correct. It has to do with the way the O2 correction works.

Thank you very much. My O2 wire snapped and the update only on ign event confused my testing. I can confirm that it works fine when the motor is running. Now if only I could figure out why my fuel pump output stopped working. Know anywhere where I can find a V3 schematic?

Geking,

There are links all over these forums to the manual. The table of contents is is here: http://www.megamanual.com/mtabcon.htm , you will find a link to the V3 schematics listed there.

Lance.