Could be that the ADC reference voltage has gotten noisy (VRH pin 52, VRL pin 51). The IAT sensor has it's own local reference so it would not be affected.
----- Original Message ----- From: Adam Wolf To: Bill Cardell Cc: Miata Power List Sent: Friday, June 10, 2011 11:55 AM Subject: Re: Link sensor readings erratic All grounds on the car are freshly checked and cleaned. I also checked ground continuity on the ECU with my multimeter. It grounds well. The one that stumps me is the ATM sensor. As far as I know, that's physically on the Link board itself. Adam On Fri, Jun 10, 2011 at 12:15 PM, Bill Cardell <[email protected]> wrote: I think I would be looking for the signal grounds those signals have in common. Bill Cardell TurboDog's Dad Flyin' Miata HELP FLYIN' MIATA GO TO TARGA NEWFOUNDLAND! Targa Miata Facebook page FMWestfield Sales 1-800-359-6957 Tech 970-464-5600 Before you call, check out http://www.flyinmiata.com/FAQ/ ---------------------------------------------------------------------------- From: [email protected] [mailto:[email protected]] On Behalf Of Adam Wolf Sent: Friday, June 10, 2011 12:09 PM To: Miata Power List Subject: Link sensor readings erratic I've been having a problem with my Link (an Obiwan installed in a 95 NA with a Boomslang adapter harness) for a while now. None of the readings on the keypad are very stable. It started out with the water temperature jumping 6 degrees several times per second (88,90,92,90,92,88,90,94,88, etc) and now the rest of the sensors are following. I initially thought this was just a bubble around my water temp sensor, but when ATM started doing the same jump, I thought I'd send an email. Yeah, atmospheric. Just sitting on my driveway ATM jumps from 81 to 86 and back a couple of times per second (I live at 5500' in Albuquerque). That doesn't seem right. MAP is also quite jumpy. As a result of the MAP being unstable, I drive along in T mode most of the time. Sometimes, it'll settle down to a 1 kpa fluctuation and I can get L3 numbers on my keypad. But most of the time, I get rapid 3-5 kpa jumps while cruising with a very steady foot. That puts me in T mode. Suggestions anyone? It seems like a problem with the Link itself. Perhaps there's a capacitor on the board somewhere that likes to give out? My ribbon cable is in good shape and I never get garbage characters on the keypad. The car itself never cuts out. I'm just getting very rapid fluctuations on the sensors. The only sensor that seems to give a steady reading is the air temp probe. Thanks, Adam ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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