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There are a few things you can do to figure this out. Take off the top cover plate- is there a small board about 1/4 the size of the ECU thats screwed in upside down just below that top plate?? If so, that's the knock sensor board, and it's probably a p72.

Is it chipped? If so, you can pull the chip and read it...but that requires a ROM reader. This will not tell you what the ECU is exactly, because any OBD1 ECU can read any OBD1 program...what will help is seeing what features are enabled- IABs, ELD, etc.

Other than that, good luck. Why you need to know?
 
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