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I’m doing an L86 8L90 swap and have a few codes left to deal with. U0100 and U0101. I checked for continuity between the ECM, OBDII port and TCM. There are 4 of those white and dark blue data wires going into the TCM connector but only 2 of them are giving me a reading on the multimeter. Power ground and ignition power are good going to the connector. Since it seems to be wired correctly going to the connector, is this a tuning problem? Someone said that the ECM and TCM don?t mate but from what I can tell from the diagrams they are linked through the OBD port.
You can see the white and blue wires in the middle of the connector I’m talking about.
I’m getting no voltage with the key on, on two of the canbus wires which I think is the source of the codes.
Again, I’m just trying to find out if this is tuning or wiring.
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Gen V 8L90 connector issues 
