See FAQ/DIY/ecu.htm, or look at the '91 service manual on this website. A used service manual should run around $50, and will save you a lot of aggravation. Or, you can order a new one from Helm,Inc, current price unknown. I understand the '91 manual is only a copy machine product.
There are over fifty (yes, 50) control units and relays in the NSX. The main one that controls the engine is under the panel behind the passenger seat.
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