Me is when OBD2 compliance , but the earlier HFM -104s do have individual cylinder misfire monitoring [both ign. and injectors] and
retrieval codes for them through the HFM-SFI diagnostic module.
These are just before OBD2 and have good storage diagnostics.
An example would be late 124 chassis 104s w/HFM-SFI.

These earlier DTCs seem to be approaching the OBD2 format, but nothing mandated yet..