Thanks for the info, FirstVolvo. The storm in the Northeast hit us hard; it's been a few days without power and tree branches down everywhere.
Car is still throwing the P0740 code and going into limp mode, with and without the MAF sensor connected. I'm still getting the engine speed=6000 rpm frozen value. The last time it happened I was in 5th gear doing around 50mph and I saw the VIDA readout for engine speed actually say "6000" and a couple seconds later the car went into limp mode. My actual rpms according to the tachometer was around 2000.
This is going to take some time and patience on my part to continue to gather data, make some educated guesses, and try some different things. Again, this car doesn't see a lot of use so I'm going to relax, take a step back, and just use the car around town for the time being til I can figure out what's what.
As for whether the trans is locking up in 5th gear - yeah, I think it is. It definitely doesn't seem to be slipping or downshifting into 4th when accelerating gradually at highway speeds. I'm not doing a lot of hard driving at 55+ so maybe I'm not putting the TCC thru its paces to test the lockup function. All indications in the VIDA readout show no anomalies until a 6000 pops up in the engine speed rpm and then P0740 code.
FirstVolvo, I'm definitely looking into other factors such as sensors which impact TCM behavior. It's just gonna take me some time to work thru the different possible causes for that 6000 rpm engine speed value. The engine speed reported by VIDA follows closely the tachometer reading until it changes to 6000.
Thanks everyone for your support and guidance! When I feel like I have an answer for this code, I'll update this thread.
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