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Pageda is right. For the future (i.e., your next 240), very limited on-board diagnostics begins with LH2.4. You can easily see if your next car has this OBD-I simply by looking at the rear (firewall) side of the drivers-side shock tower, which would have a little black box fixed to the side of the tower -- this is the interface for the OBD-I, which communicates visually by giving a blinking LED code.
As I said, it's limited, nowhere near the sophistication of OBD-II where you can plug in a digital interface for the fault codes, as well as monitor engine functions in real time. For that, you need a '96-on car.
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