reading diagnostic codes

I'm attempting to read the daignostic codes on my 92 T/C. The manual I have is vague in describing the pin numbers on the diag connecter. The plug has two rows of pins, the top row has two pins and the bottom has 4 pins. Does anyone know how they are numbered? I need to identify pin 2 and pin 4. The connector is something like this:
XX
XXXX
If anyone has any suggestions to simplify the process, please let me know.
Thanks to all,

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I'm attempting to read the daignostic codes on my 92 T/C. The manual I have is vague in describing the pin numbers on the diag connecter. The plug has two rows of pins, the top row has two pins and the bottom has 4 pins. Does anyone know how they are numbered? I need to identify pin 2 and pin 4. The connector is something like this:
XX
XXXX
If anyone has any suggestions to simplify the process, please let me know.
Thanks to all,

The diagram is very clear, thanks. The book says to read the codes first without the negine running and then with the engine running. I will try again this weekend and let you know the results.

Because the check engine light was on, I was reading the codes. I got as far as the key on engine off. I turned the key off and the Check Engine Light went off. I drove the car about a mile and parked it, it hasn't came on again.