I know it a old setup but having some issues with my sons 06 H3. You can't read it through the OBD but pulled the ECM and bought 2 spares as well. The bench harness used from the E40 which has the same pinout will also not work. Not even finding the ECM. i looked at the bench harness and then compared pins to the P12 and E40. They are all the same except the pin 1 and 2 which is Can+ and Can- on the E40 but the P12 does not have CAN so I would not think this is an issue. Everything else is in the same spot. It will not work on either of the 3 ECM's so it tells me it is a comm issue since the truck will run on the current ECM and it will scan in the truck. Any help on this is appreciated.
Thanks
Justin