You know I ve been thinkin the same thing. When my CEL came on for the first time I looked up on Internet and I found that 94 ES have ODB2 connector, so I bought a scantool. It of course didnt work, cuz it was sayin that it was unable to make a connection. I got pissed off cuz I spend $100 on the scanner. Yeah, I read somewhere in the forum or on the web about the difference in the wires on the OBD2 plug for OBD1 ECUs. SO your idea may work only by swithing wires. Im not sure, but Ive heard that when u ground pin1 you can either count the flashes of the CEL or use a not digital voltmeter on one of the other pins and count the pulses. Someone correct me if Im wrong
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