Hi,Trans is identical in all respects. I replaced the parts as they were chicom copies ,one contact plate was actually missing a pin. The second had the metal strips inside touching each other ,which blew the first two TCM's before i realised what caused the power supply in them to fail. This TCM is new as are the contact board and pilot bush and are genuine OEM .I have all the circuit diagrams and pinout readings which all show the electrics should be in order .High and low work independently of the actual trans ,the speed is determined by the two round magnets on the contact plate,so... the low function works perfectly . these are constant 4x4 BTW. i am using the only scanner out plug which is the usual OBII plug under the dash. I have set up faults in the other systems deliberately to test my scanner and it clears them just as they should but this one has me beat.