How to Check Engine Codes

[Keephergoin]

I have the manual, and it says to connect a test wire to the 2 leads in the "Check Engine Connector"

Ok, so... WHERE IS THAT???

I have lots of plugs that look like they could be test engine connectors but I dont have the will power to try every one of them. I think it would be a bad idea as well, considering it is so old I feel I would break something doing that.

The picture in the book is no help... only more confusing. It is not the haynes manual but the Toyota Repair Manual so it is probably geared towards Toyota Dealer Mechanics... at least thats how I will rationalize this dilemma. I usually wok on bikes... I bought this awesome van to haul said bikes around and I need to fix this check engine light to pass inspection here in TX!

Thanks!!!!