Code reader will not get data but gets power?

2008 CHEVROLET MALIBU
140,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
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GLENN_MX6
  • MEMBER
  • 1 POST
We have tried AutoZone's reader and my cheap one and I get power to the code reader tool, but I can’t get any data.

I tried looking through the fuses under dash and under-hood but I may have missed something. Any ideas?
Jul 5, 2024 at 1:57 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,238 POSTS
The data connector has one power lead and two grounds, I would use a test light to test for the power also check the HVAC control fuse in the fuse panel inside the car and check the data connector grounds.

Here is a guide to help with the test:

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

Here are the data connector wiring diagrams so you can see how the system works. I have marked the wires you should test. Check out the images (below). Please let us know what happens.
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Jul 6, 2024 at 5:12 AM
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