OBDII not working

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Sep 7, 2007 | 11:50 PM

fishman002

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From: Louisville, Kentucky

OBDII not working

I have no power on my OBDII port plus my cigarette lighter. I checked the fuse and it is OK. What next? My truck is a 2000 F-350 7.3 dually 4R100.

Sep 7, 2007 | 11:53 PM

Tenn01PSD350

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From: Middle Tennessee

Check another fuse. I am off to bed. Same thing with wife's F150. Fuse #3 there and both the lighter and AE worked. Find the fuse and you'll be in.

Sep 8, 2007 | 06:36 AM

zx250

Of the next Riffraff East

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From: Concord NC

Yep, it is fuse #3 under the dash that powers both on your truck and a lot of Fords. Make sure it is good and we'll go from there.

Sep 8, 2007 | 10:35 PM

fishman002

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From: Louisville, Kentucky

ALL Fuses are OK.

Sep 8, 2007 | 10:41 PM

zx250

Of the next Riffraff East

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From: Concord NC

Does you cig lighter work???

Sep 8, 2007 | 10:43 PM

fishman002

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From: Louisville, Kentucky

No it does

Sep 9, 2007 | 07:20 AM

zx250

Of the next Riffraff East

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From: Concord NC

Quote:

Originally Posted by fishman002

No it does

????? I'm sorry, I don't understand. Does this mean it does work or it does not work. The cig lighter and the OBD port are both powered off fuse #3 under the dash. If you lighter is out, then you have no power to either one. If you lighter works, Then ?????

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Sep 9, 2007 | 09:36 AM

dmueller71

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Joined: Jan 2005

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From: Mazon, IL

OK the cig lighter does NOT work, but he says all the fuses are ok. Is he just missing something or is there another possibility? He says the #3 is a 20A is that the right one? Also, when I was under his dash hooking up the DP, There was some kinf of box wired up near the OBD connector. I was assuming that it was part of a trailer brake controller that was removed. Is there some kind of connector that could've been accidentally pulled apart when someone was removing things?

Sep 9, 2007 | 11:12 AM

#10

Tenn01PSD350

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From: Middle Tennessee

I had same problem with wifes truck. Cig lighter didn't work either. Was the 20 amp #3 fuse. Now it and OBD port works. If the fuse is good, test the leads coming out of it or the wiring at the cig plug. May have a problem at the fuse panel area.

Sep 9, 2007 | 01:02 PM

#11

zx250

Of the next Riffraff East

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From: Concord NC

Hey Tenn, Did you get the wifes truck going again?

Jan 2, 2008 | 09:22 AM

#12

petrvan

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I had the same issue. After reading this thread, I checked the lighter, cold. I pulled fuse #3 and it was blown.

Now my OBDII works again! Thanks for the info.

I was having a mis-fire in a cylinder and needed to find out which one. Now I know it's #5 that needs a new coil pack.