Hi i would have said that if it says ABS control unit then its the ABS control unit and not the TOD computer - the Japs are not going to lable the unit wrong they are very good about stuff like this -
I would start at the beginning and get the speed sensors changed before even thinking about the TOD unit - how can the unit even begin to work if the data its getting is incomplete ?
I presume you have the 'CHECK' lit up ? i am sure you can read the codes from the ODBII socket and there is a post on here all about how to do this - in all probability although the computer is tech 2 it will not beable to talk to the TOD unit anyway don't forget the JDM are an early ODBII almost experimental ecu unlike the US version which is true ODBII
i would get the sensor done and then see if the TOD sorts itself out
regards
Steve