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This was a really odd failure but your prevailed with finest troubleshooting.
While you're motivated not to get a repeat, check/clean your GND circuits for ECU and undercarriage salty strap.
Did find a sheet that showed the body grounds. All of them looked fine. The resistance reading from the ECU harness shows all grounds are in good shape.
For anyone reading this thread in the future, charm.li has the schematics. The poster near the top called out a wiring diagram, but from charm.li it doesn't match what I have. There is one wiring diagram that does, recommend looking at your colors and checking each one to see what matches reality.
> ECU GND Circuit...
Everything looks like that shared GND circuit is your issue.
> Can you compare left bank to right bank GND Circuit?? you're likely going to find differences that should not be.
-- You know bank1 is your good Reference
-- You're questioning bank2 is bad GND Circuit... where does ECU gets that GND ?????
> TEMP Sensor :
is located in the back of Bank2 head near the firewall... ohm it from the ECU harness pin... its a bear to work where it is located AND IT'S GUARANTED TO LEAK unless you have a fresh O-ring (incentive to not disturb it!!)
Value maybe 1k to 4.7kOhm... something significantly high.
> Getting close :
you know what the issue is: shared GND
missing the cause of bad GND Circuit
> check GND sources for ECU.... there are a few, compare without battery power in circuit
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