I was thinking of electrical changes. Toyota changed the ECU construction in the middle there and the diagnostic connectors changed along with a fair amount of wiring... I just don't know all the details.
I just looked it up and Toyota switched the MKII to their TCCS system in '83. So it's probably '82 and some '83 (L-Type vs P-Type). If anyone has more info or info to the contrary I'd like to know, I'm just going off of a quick survey of Google and CelicaSupra.
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