5m-ge check connectors

[tonster]

I'm trying to check out stuff on my '82 Supra and can't find any info on how to use the check connectors in my Chilton's book besides for the fuel pump. Also, there doesn't seem to be the check connector for getting the trouble codes with the engine light. In fact, there is no engine light in my analog instrument panel... The wiring diagram book I have lists three, the one for the fuel pump, oxygen sensor, and emissions. Anyone know what can be done and how to do anything with the oxygen check connector and emissions check connector? They are near the front passenger side tire well in the engine compartment.