that's my observation too. the corvette doesn't have much crazy traffic on that line, but i've found people that connect before starting the vehicle have a bit better luck. i doubt they would have bothered to push all the obd-ii pids on the obd-i datastream. i bet 'class 2 serial data' is mostly unused.
you have no idea. there's barely a gap, but there are gaps. i think if i just saturate the bus to shut up the CCM first so the heartbeat goes away then maybe any other modules that are problematic, i'll be OK.I checked buick bin and there is much more idle traffic sent from pcm. ALDL message located at this address.
F2 CB
F2 D7
F2 F5
F3 1B
F3 25
F3 2F
F3 39
There is really long messages out there.
how i do it already for f-bodies, but they have an approx 30msec gap between idle traffic, so if i use a 75ms gap between my messages, it pretty much always lands on a blank spot within a few tries.
i had a very helpful user (who is testing this stuff for me) dump a buick and a caddy, both key on and key off. file attached.
there's a ton of junk on that bus. look at this, maybe you can make sense of it, i sure can't! he can make it connect by pulling fuses, but he says there are three fuses, so i think the CCM heartbeat isn't enough (maybe another device takes over as master?)
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