errrrrr. wrong.4-runnin said:The plug is on the drivers side, just behind the air box and beside the PS pump. It is not marked. Jeremy gave you the description for the plug on the 3VZE 3.0 V6 motor. It is a small yellow connector with nothing connected to it. It may be capped (probably not). Just jab a wire into it. You will know you have the right one because the check engine light will begin to flash and the idle speed will change.
4-runnin said:He probably knows what he is talking about, but he got drivers and passenger side mixed up. The plug is on the drivers side!
I suspect it is possible they changed it on later models (90's). But I personally have never seen any of them with it on the p-side and I have seen about a millkion.
K, I re-read your post Jeremy and ithey must have changed it at some point. There is no diagnostic terminal on my or any other 22re I have ever seen so they must have changed it on later models. Ruggles, what year is your truck?