January 20, 201016 yr What do these do? How when do I use them? Just asking in relation to this thread, I googled somewhere that I may need to connect them in order to get OBD to record readiness codes for the emissions. Do I need to do this for a 98 OBW?
January 20, 201016 yr I don't think those need to be connected for OBD readiness monitors to be set. What the Test mode plug does is put the ECU in Test mode. It runs a diagnostic of all the relays, solenoids, and some sensors. It has it's uses, but I don't think OBD monitors are one of them.
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