Corvette CCM Reverse Engineering Anyone?

[NomakeWan]

Actually kur4o is correct. The actual hall effect sensor connects to the (our) PCM on a31 and a32. Then it converts it to 4000ppm and outputs it throughout the vehicle on b8. The CCM (and any other modules that need it) gets this conditioned signal on e2, not the actual hall effect sensor. Otherwise the CCM would also need to be programmed for diff gear ratio. This is completely independent of the aldl.

Yeah, I had to re-read what he typed a few times before I realized my mistake. I was reading it in the context of our current discussion, which was regarding ALDL comms via the CCM. But he wasn't talking about that at all, he was talking about the PCM independent of the CCM, a completely different unrelated topic.

My bad. Anyway, the local electronics shop didn't have the components I needed......so I ended up buying a huge kit that had them plus a bunch of other random shit I can keep in my lab for a rainy day. Sucks paying $16 more than intended, but at least I'm good to go. Should have a new interface ready by tomorrow.

EDIT: As to the memory dump, there are only two address spaces that are rejected by the memory dump routines (both Mode 2 and Mode 3). These are:

$1000~$103F: CPU registers. These are restricted because attempting to access them via ALDL could lead to the CPU crashing.

VATS: All VATS memory locations are restricted and will return 00 unless the correct key for the vehicle is inserted and the ignition is set to run. My dumps were all done with the key in and the ignition in run, so these locations should be populated. My datasheet doesn't specify the memory locations, but it should be fairly trivial to find them by just taking a dump with the key in and ignition on, then immediately taking another with the VATS connector disconnected. I can do that later.