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Not sure about OBD2 compatibility on the pre 96 transmissions. On Nissans there was a sensor that counted the teeth on the flywheel ring gear and it did passive cylinder balance by comparing the rate of acceleration and deceleration of the pistons on each combustion cycle.
It can tell you which cylinder is not producing as much power as the rest as a percentage and is a valuable diagnostic tool.
I'm not sure about Hondas but OBD2 was required on 96 models. Ask me how I know about it?
I rebuilt a 95 200sx which was a coupe version of the new model Sentra for 1995, first year of OBD2 for that model. The sensor was broken in the wreck. Nissan quoted me $850 for the sensor. I checked the manual version and it was $35. They had made a mistake in pricing the auto version of the sensor and they finally got it straight.
That sensor lit a CEL every second engine start. It was not a primary system sensor, just a part of OBD2 diagnostics that allowed cylinder balance to be compared without disabling anything.
regards
Mech
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