I have been having a problem with my ECUs. I have TWO P28 obd1 ECUs with Hondata s200. These are controlling a JDM b18c in my 1991 EX civic. One is a European P28 with the TA circuitry knocked out (once I figured out that it was a false error code), and the other is ordinary US market version. The first P28 now gives a solid light for a code but used to give 6 and 43. The motor runs fine in non-VTEC but sputters on x-over to VTEC on gears besides 1st gear. If I take first gear into VTEC and keep it in VTEC there are no problems (except mild idle control issues). The 2nd ECU with US P28 gives codes 1,2,3,4 and no others and does this even when I disconnect the battery to let it reset. Any ideas?