therigwelder

i own an 02 silverado 2500 the service engine light soon has been lit for several weeks now i finally got around to hooking my scan tool up to pull codes well i plugged the scanner in and nothing happened no power was coming from the vehicle connecter i tested my scanner on another vehicle to confirm it was working and it was.now i need some help troubleshooting the faulty obd II port on the truck

2000CAYukon

Does the cigarette lighter work? The OBD-II port shares the same fuse.

//2000CAYukon

therigwelder

well i have 3 12v outlets 2 of them work all fuses are good

MT-2500

http://www.troublecodes.net/OBD2/

Check for ground on pin 4-5
Check for 12 volt battery power on pin 16

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Remember proper testing gives us the answer to many problems.
MT

Bob B

When my obd11 port was dead, so was the lighter socket.
It was the fuse.
Meter the fuse or swap it. They might look good but be bad
Bob B

J-Ri

I'd bet the one lighter that doesn't work shares power with the DLC. Either a fuse or an open wire. If you don't care about keeping the wiring factory, just cut the power wire a few inches away from the connector (to leave room to re-connect if you ever decide to fix it) and run a jumper wire from it to the battery or another lighter when you want to check codes. It doesn't go to any computers at all, it just provides power for a scan tool.

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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners

'86 3/4 ton Silverado
350 V8, 4x4, 4" lift, 1 ton axles swapped, converted to 4 wheel disc
35" BFG Mud Terrain T/As
Shortened to 109.5" wheelbase for those tight trails

http://www.boycottpepsico.com/default.aspx

You see "Fresh oil, loose gravel"; I see "Free undercoating"