Checked all fuses under dash and under hood, cig lighter and all other things work. Engine lkight is on. Car idles real bad, seems like once it gets warm its confused and does not know its too hot. I can drive for hours on the highway, but only 10-15 min in traffic. cant get engine code because of the obvious issue I mentioned, no power to datalink.
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Sounds more like a key switch or fuse box problem.
The circuits you mentioned would be on separate fuses but could be connected to the key switch. The relays are grounded by the engine computer to be energized.
In the 2000 Sonata, the fuse panel will be in the drivers area under the console all the way to the left, mid way. Look for cigarette lighter or lghtr or something like that. If you can't find it, look under the hood in the engine compartment. There are fuses and relays there.
FIRST IS THE FUSES UNDER DASH AND UNDER HOOD FUSE BOX. OBD2 POWER IS FROM THE CIG. LIGHTER FUSE. UNPLUG PHONE CHARGER OR ANY OTHER FROM CIGARETTE LIGHTER AND TEST FOR POWER. THROTTLE IS ELECTRONIC AND CONTROL FROM PCM. IF YOU DON'T HAVE SCANNER DISCONNECT THE BATTERY AND CONNECT AGAIN. SOMETIMES NEED 10 MIN. DRIVING TO LEARN THE IDLE.
First thing to check: fuse(s) for the cigarette lighter/power port, which may also be the same fuse for the interior lighting that went out. Could post the location of your fuse box (most Hyundai cars have 2 - one under hood, and a second under the dash (where your power port/interior lighting fuses are most likely located)), if you could clarify which model/year/engine size Hyundai car/truck is giving you problems.