OBD2 connector not getting power?

Okay, thank you. I tested my OBD2 reader and it works on other cars. Would you by any chance know where I might be able to get a PCM. I've tried eBay, car computers and they did not work. I have to get this Jeep started. I hope we can do that. Thanks.

Hi Ken,

I know to change the computer. I have used All Computers, car computers, and one from eBay. I don't know why none of them worked.
Dg

Hello Ken,

Sorry about not getting back to you. It’s been cold here with snow, wind, etc. I have a challenge for you. On Jan 26, 2024, it was warm, and I stepped outside and decided to see if the Jeep would start, it started. I couldn't believe it. Man, I was so very, very happy! I let it run for about 15 or 20 minutes and it ran. My buddy said I should go for a drive and I was very hesitant to do that. After a few minutes I decided to take it just down the street and back.
Well, I drove the Jeep 1.1 mile and it went dead. It lost all power, and it would not start. I’m stuck in the middle of the road. AAA did not even show up... So, the officer called a tow truck for me, and he got there in 5 minutes. So, I had the Jeep towed back to my house. Now I'm back to the drawing board.

Dg

Oh yeah, this whole ordeal started at 2:30PM and didn't end until 6PM. I was quite stressed and upset over this. I'll wait to hear from you.

You know I didn't even think to check the obd port. I'll try to check it today and let you know.

I checked the OBDII port/connector and it didn't register anything on my Jeep. I used the same OBDII connector on a 2010 Honda accord and it worked fine.

Ken, I bought another OBD II Diagnostic tool (more expensive) and it doesn’t work on my jeep also. I checked it on another car 2010 Honda Accord and it worked fine. I had checked the pins in the past and they seem to be in good condition. I recall mentioning that I had taken the pins out and fixed them so they would not be lost. I can't seem to find the OBD II results I sent you. I'm going to keep looking.

I found this.
If this doesn't help let me know and I'll go out and check the wires you want me to check.

I checked the OBD2 pins 4, 5, and 16. 4 and 5 are ground and 16 is power 12V. I got a reading of 4.21 from pin 16+ and I check it with pin 4, 5-. So, what does that mean? I have a little bit of power coming to pin 16. I also took the 2 screws out that hold the OBD2 and checked the wires in the back of it. I didn't see any broken wires there. In fact, they look new.

Ken,

Okay, you remember that I replaced the PCM twice and it didn’t work. In the past I checked the OBD2 pins 4, 5, and 16. Pins 4 and 5 are ground and 16 is power 12V. I got a reading of 4.21 from pin 16+ and I checked it with pin 4, 5 which are ground.
How would you explain the jeep starting the other day and running for as long as it did. If the PCM was bad or had issues, it wouldn't start or run. I have no idea what triggered the start. I've been learning a little about electronics for beginners hoping to find an electrical short or something. It’s not easy at my age to learn electronics. I could take the PCM off the jeep and open it up to see if there's something burned out. That’s probably the only diagnosis I could do. My challenge is that I don’t know how or what to check anything on the board with the voltmeter. I also don't know what the reading are supposed to be on the component. Do I set the voltmeter to check the ohms, voltage, continuity, diodes, etc, you know I cannot read the schematics. Oh, I also bought a new voltmeter so I can be assured that my other two meters are working properly.
Thanks,
dg