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So I bricked my ECU testing a routine that would read frequency over the ADC line. Didn't check my programming work thoroughly by running each step through HEW as I have in the past. Part of the routine made a bad call and sent my ECU into a loop as soon as the sensor scan routine is run (almost immediately).
Lesson learned with a new idea - it would be easy enough when testing any new routine to switch into it via defogger switch: if it hangs, the ECU will still communicate for a re-flash with defogger switch off.
Have a new ECU in from dealer recoded to my keys. Will resume this project when a suitable unbrick solution available - I'll start that thread.
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