OBD2 says everything not supported

Tiny
JIM ANDERSON2
  • MEMBER
  • 1999 HYUNDAI SONATA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 175,000 MILES
I cannot pass or fail the emission test cause they cannot get my car to read. All the monitors say unsupported. This car has always passed before. Nothing new has been added. The check engine light is even on, however when I plug in my hand scanner it says there are no codes?
Thursday, August 24th, 2017 AT 9:16 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,303 POSTS
So your scanner communicates but theirs did not? It sounds like you need to go to a different smog shop.

Am I correct or reading it wrong?
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Friday, August 25th, 2017 AT 11:39 AM
Tiny
JIM ANDERSON2
  • MEMBER
  • 2 POSTS
Sorry, My scanner turns on but as you can see, everything is unsupported. Check engine light is on, so I assume the ECM is working.
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Friday, August 25th, 2017 AT 12:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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It does not seem to be communication like the ECM is bad does it run okay? May be some of the ALDL connector wires have a short or open circuit.

Here is a guide and a wiring diagram so we can do some simple testing:

https://www.2carpros.com/articles/how-to-check-wiring

Make sure all the wires work test at the connector.

Fun to see what it is.

Cheers, Ken
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Friday, August 25th, 2017 AT 7:25 PM

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