OBD port fuse is not picking up any information?

TONYSBABYGIRL

MEMBER
2010 CHEVROLET MALIBU
3.0L
4 CYL
2WD
AUTOMATIC
150,000 MILES

I'm having an issue getting an inspection done on my vehicle. The state machine isn't picking up any information from the OBD. I have an appointment tomorrow to drop my car off so my mechanic can look at it, but someone said I should first check the fuse. I've tried looking on the internet to see where exactly the fuse is, but I can't seem to find the information for the car listed above. Can anyone help?

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,567 POSTS

Yep, I can help, also this video might help as well:

https://youtu.be/6Tlg3JmgNSQ?si=x0jPNHg86DXm84OW

Here is the location for the ALDL data port connector which is the HVAC CTRL fuse 10 amp on the BCM fuse panel. If the fuse is okay, I would check the grounds as well, this guide can help, and I have included the connector wiring diagrams so you can see which wires to test.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Let us know how it goes.

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Tuesday, September 3rd, 2024 AT 9:53 AM

TONYSBABYGIRL

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I checked the fuse, and it was fine. I brought it to my mechanic. He said that the 2 main prongs on the OBD didn't quite have the right amount of power, but he checked the wiring, and he said everything looks fine. So now, he says I need to bring it back to a Chevy dealer because the only thing he could think of is to have the computer reset. Does that sound about right?

Update: I just spoke to a dealer and they said I can disconnect the battery for about 15 minutes, reconnect it, and drive about 100-150 miles and that should reset the computer.

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Saturday, September 7th, 2024 AT 5:55 AM

KEN L

MASTER CERTIFIED MECHANIC
47,567 POSTS

The data port should have 12 volts at the red and white wire, and ground on the blk and blk/white wires. Can you confirm? Please follow the guide above.

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Saturday, September 7th, 2024 AT 7:30 AM

TONYSBABYGIRL

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I went out and got a multimeter but can't figure out how to use it (the setting it should be on). Can you please tell me which setting to turn it to for each prong and what the meter number is supposed to be at?

Update: After watching a video, I think I did it correctly. I set it to 20 in the upper left of the meter and checked 16. It came up at 12.70. I changed it to 200 directly on the bottom of the meter. 4 was at 2.1 and 5 was 1.7. I think those are supposed to be at 0, right?

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Saturday, September 7th, 2024 AT 7:04 PM

KEN L

MASTER CERTIFIED MECHANIC
47,567 POSTS

Sure, here is a guide you can go over to help understand the voltmeter, but I would use a test light which is easier, please go over both of these guides:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over these guides and get back to us.