Replacement ECU showed up today, engine started right up & ran fine. Now for a road test & see if the trans will shift.
Edit - mixed success. Didn't work so well once I drove it, trans did shift which was a worry with an unknown PCM, but it still gave me an MIL after just a short time and idle rpm changed.
Looked through the driveability manual and found a reference to check the neutral switch, I did that and it was out of adjustment (how I don't know) but I reset it and things seemed to smooth out after that.
Took it out and ran errands in town all afternoon and it was fine in mixed driving, highway and in traffic. I was thinking once again it was good to go...and then it gave me another MIL and a high idle. (I've not been able to get a code out of this thing the whole time, when it goes bad I also get no-com with the scan tool.)
On the way out of town it went to neutral again but I was ready for it this time and got off the gas, the trans dropped back into gear without me having to stop this time and I got it back to camp Ok.
But I'm wondering if I've got a bad DRAC module and might be losing the VSS signal? To my mind that could do weird things to trans operation.
I can put a scope on it tomorrow and check a little further.
Pretty well frustrated with it for right now, but I'm not quite ready to give up on it just yet.
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