P0200 code and misfire on passenger bank LM7

[leegreen]

Just to check:is this a gen3 or gen4 engine, ecu and harness? gen3 is 12v from ecu to campositionsensor, gen4 is 5v. The repaired circuit is 12v switched from ECU, correct?

so this was a clear wiring problem
P0200 is a likely wiring problem
P0605 can be caused by wiring problem or the computer can erroneously trigger P0605 if there is a voltage issue at ECU (supply or ground side could cause)
hmmm

Did you take steps to clear P0605?
Disconnect battery, short the cables together and leave for an hour, reconnect, clear codes. if P0605 comes back immediately ECU is probably toast
I haven't had occasion to try that myself.

We have a cut up harness that powers/grounds the ecu and provides OBD2 port, that would be handy in this situation. Too bad your scrap yards are not full of trucks where you can get the harness cheaply

In your shoes I'd want to spend some critical time with the harness, the correct wiring diagrams, pinouts and a multimeter before connecting a new ECU