STC wrote:It proves Only what you have. It does not prove that it is what it was the day it left the assembly line !!??
Yes, I know what you are saying, but to have 2 EOBD lines shorted out, and allow diagnostic access over them is just not a possible fault or someone having messed about, it would be a piece of engineering excellence to extend the BUS like that even as a desired aftermarket MOD (it would be a branch and exceed the 30cm +/- limit on length), and I'm content that the technical data I have, and the pico captures proving it, confirm in this case it is the design of this car!
While the single wire shorted onto the bus is wrong (via pin 90 of engine ecu's) onto the main powertrain bus low side (at the engine ECU this is pin 67), and that pin 90 should be a High Side pair with pin 89.
But, It's not about the EOBD access, so this is not relevant to the fault we have (at this stage anyway!).
I'm concerned with why the internal networks are reporting errors, and that we do not get any diagnostic signal drop-out (yes different tolerances and recover strategies). The powertrain noise is more likely to be related to the short onto another can bus than our pico/diagnostics...
So lets focus on the issues that might cause the problems (similar cases people have observed including VAG models as many ECU are similar) or technical data of the components (ZKE, GFA, ILM, etc) to allow us the understand more and determine what else might be wrong, especially cause such a widespread number of comms errors ...
- anyone seen the Steering ECU (column stalk and ignition unit) fail and bring down other systems?
- other multiple ECU comms failures from single ECU being at fault (ie across several CAN BUS?)
- Anything else relevant?
STC, Appreciate the help, your 500k observation helped heaps, but no more about the EOBD wires pleaaaasssssseeee (I'm overseas myself, otherwise I'd say pop over and see with you own two eyes!! as you are only 3-4miles down the road from me...and it's been a while since we had a catch up!)