Engine Check Light. Obd1

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The engine check light has appeared on our 1993 civic SiR.
According to Hondata and other sites, you can find out what's causing this by finding two blue diagnostic wires near the passenger footwell, short them out, and the check light will flash the problem.
Has anyone ever done this? If so, where do you find the blue wires, and how do you go about shorting them out? OR should I leave this to Honda?
its very simple... pull back the carpet on the passenger's footrest and you'll see the ecu on the right hand side. look for a plug with two wires in it and use a piece of wire or a paperclip to short it out. turn the car on and check your codes.