An OBD-1 engine with an OBD-1 ECU is the same. The ECU triggers the IAB. You've got an OBD-2 ECU in a '94?? I suppose it's a different pin on the ECU. So maybe he found that it's wired up wrong? Or maybe that guy just doesn't know...

IAB is pin A17 for '95, I don't know which pin for OBD-2.