OBD port not working

Tiny
RICKSHAULING
  • MEMBER
  • 2007 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
The OBD port will not work the cigarette lighter will not work in the 12 volt accessory plug-in on the dash will not work. I have replaced the cigarette lighter still not working. I have checked all connections, I have also checked all fuses they are good. What could be the problem? Thanks for any advice.
Sunday, November 4th, 2018 AT 6:42 AM

34 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Check fuses 41 or 110.

I grabbed you part of a Prodemand diagram.

Click on it below.

The Medic
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Sunday, November 4th, 2018 AT 2:30 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
I replaced the 110 fuse and the 41still no OBD port still no cigarette lighter, still no 12 volts on the dash. None of the three are working still. One month ago I had the junction box replaced because the gauges and A/C kept flickering on and off. My friend said sounds like the j Box was bad so replaced had it checked out. It was the alternator. Would this maybe be a cause also? My truck manufacturers date is 11/06 which mean it is a early 2007 I believe.
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Monday, November 5th, 2018 AT 1:02 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
  • 2007 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
OBD Port and cigarette lighter not working. All fuses has been changed 41 and 110 also the 12 volts on the dash plug-in does not work. Any help would be appreciated.
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Wednesday, November 7th, 2018 AT 2:14 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon.

I could not read CJ diagram but I attached my own along with the schematic for the connector as well.

Go to the fuse listed and make sure you have power on both sides of the fuse all the time. If you do not, that would account for the issues you have.

Lets start there.

Roy
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Wednesday, November 7th, 2018 AT 2:24 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon

I could not read CJ diagram but I attached my own along with the schematic for the connector as well.

Go to the fuse listed and make sure you have power on both sides of the fuse all the time. If you do not, that would account for the issues you have.

Lets start there.

Roy
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Wednesday, November 7th, 2018 AT 2:24 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
Are you talking about the fuse itself or the fuse box where the number 110 and 41 fuse goes? Because I put a multi-meter on each side of the fuse and I get a ding so that tells me the fuses are good.
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Wednesday, November 7th, 2018 AT 3:22 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
Roy,

I do not think your diagram posted properly.

The Medic
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Wednesday, November 7th, 2018 AT 3:22 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
Yeah, I try to pull it up it will not come up. Like I said all the fuses are good wires are good. I changed out the junction box a while back because I had up flickering in the gauges and the AC were turn on and off. So I changed out the fuse box same exact kind a new fuses. Would that have something to do with my problem?
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Wednesday, November 7th, 2018 AT 3:28 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,005 POSTS
I will jump back in until Roy cranks back up.

Not saying this is the issue.

But,

You can have juice entering the fuse.

Then

Traveling over the filament to the other leg (side).

You will verify the fuse is good with a meter or test light.

However,

Should there be corrosion on the output leg of the fuse

Or

The "holder" is damaged or melted on that side, the juice will not flow on through the circuit.

I see the corrosion thing on Jeep CJs from time to time due to moisture able to sneak in.

You might actually pull the fuse and inspect its legs and inside of the holder with a good light source.

Back to you Roy!

The Medic
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Wednesday, November 7th, 2018 AT 3:32 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
Every single fuse in the junction box has been replaced still no power to the cigarette lighter OBD sensor or 12 volts. Also my manufacturing date is 11 of 2006 so that would make my truck and early 2007 so that would make fuse 41 my OBD sensor and cigarette lighter. But when I put a fuse back in the 41 slot also fuse 39 it is like it does not want to stay in it is very loose. Also changed the 110 fuse was a brand new one.
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Wednesday, November 7th, 2018 AT 3:35 PM
Tiny
ASEMASTER6371
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Thanks CJ.

I reposted. Check for power at the box. Make sure you have battery voltage at the fuses.

Roy
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Wednesday, November 7th, 2018 AT 3:36 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
How do I check the voltage at the box with a multi meter or a test light? I believe a multi-meter the leads are too big to fit in. What do you recommend?
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Wednesday, November 7th, 2018 AT 3:41 PM
Tiny
ASEMASTER6371
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You could use a test light to probe them. The end of a test light should be thin enough to get into the top slot of the fuse.

Roy
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Wednesday, November 7th, 2018 AT 3:44 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
So what you are saying I should do is pull fuse 41 and fuse 110.

Stick the test light down in the slots after I pull out the fuse and see if I am getting any power correct with the key in the on position.
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Wednesday, November 7th, 2018 AT 3:47 PM
Tiny
ASEMASTER6371
  • MECHANIC
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You need to check for power on both sides with the fuse installed.

Roy
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Wednesday, November 7th, 2018 AT 4:02 PM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
Okay, thanks I will check for power on both sides of the fuse.

Tomorrow morning and get back with you. Thanks for your help.
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Wednesday, November 7th, 2018 AT 4:14 PM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
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Wednesday, November 7th, 2018 AT 4:19 PM
Tiny
RICKSHAULING
  • MEMBER
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I used a 12 volt testing light no power on both sides of the fuse from 41 or 39 fuse 110 works fine. Also with the fuse pulled out I stick the probe down inside the fuse box itself still no power on either fuses with key in on position.
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Thursday, November 8th, 2018 AT 10:47 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, if you have no power to the fuses, that is why you have no power to the plug. You have a wiring issue with the fuse block if there is no power.

Check the fuse box for any damage in the rear where the wires connect.

Roy
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Thursday, November 8th, 2018 AT 11:35 AM
Tiny
RICKSHAULING
  • MEMBER
  • 21 POSTS
I got power to all the fuses in the fuse box except for fuse 39 and 41 all others work. Do you believe they are still a short in the box with it just being those two only? Are there wires that go into the back of the fuse box just for those two fuses 39 and 41?
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Thursday, November 8th, 2018 AT 12:40 PM

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