OBD2 port problem
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  1. #1
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    OBD2 port problem

    I hope I'm posting in the right place. I've been trying to pull the DTCs from my 99 1.8T for the longest time with no success. I first got an ebay serial cable and tried it with both 409 and 311 shareware on 2 laptops, one Win 98 and the other WinXP. No success. I then bought a USB cable from ebay and tried it on the laptop with XP and a newer duo core tablet laptop. No success. I also tried using the software ScanPro. No success. The cables are recognized but there's no communication with the car. I now got a Innova Equus 3140 universal scanner. Same results, can't communicate. I'm thinking my OBD2 port is not working. How can I find out for sure. I really need to figure this out because I've got a "Test Only" smog check required for my registration renewal.

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  3. #2
    Resident a-hole knowitall
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    do you have an aftermarket radio in the car?

  4. #3
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    Nope, it's the stock cassette player with 6 disk changer in the trunk.

  5. #4
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    i know it sounds silly, but maybe go to an autozone or similar and borrow their cheap-o code scanner and see what it says. you won't be able to DO anything with it, but at least you can see if it is communicating.

  6. #5
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    Check the fuses. When this happened to my van it was the cigarette lighter fuse that caused this problem.

  7. #6
    2nd Gear JHigs's Avatar
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    i had one of those "cheapo" scanners..... it was the best thing i stole from my friend!!! he found out and got it back

  8. #7
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    Is there any way to figure out if its the communication port or the car's computer?

  9. #8
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    Go to a place like autozone - they will scan the codes for free, and you'll know if the port is working...

  10. #9
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    You can check to see if you get any current over the OBD port. If you are, most likely you didn't set the com ports correctly with the knock-off ebay cable (since you have a stock radio).

  11. #10
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    I have a OBD2 scanner for generic codes. It can't comunicate with car. Last time I went to Autozone they said they loan the scanner with a deposit of the price of the scanner, but that they didn't pull the codes themselves.

  12. #11
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    Quote Originally Posted by Fuzzballcadillac View Post
    I have a OBD2 scanner for generic codes. It can't comunicate with car. Last time I went to Autozone they said they loan the scanner with a deposit of the price of the scanner, but that they didn't pull the codes themselves.
    That's strange. My local autozone just asks for your driver's license as collateral.

  13. #12
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    Did you check fuse 5? Fuse 5 is for OBDII port, climatronic a/c pressure switch, and heated seats module.

  14. #13
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    Fuse 5, wow, I didn't know that. No I haven't but I will now. If fuse 5 is blown would the LED on the cable still light up when it connects to the port? Because the ebay cables have a LED that lights up when I connect them to the OBD2 port.

  15. #14
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    Quote Originally Posted by Fuzzballcadillac View Post
    Fuse 5, wow, I didn't know that. No I haven't but I will now. If fuse 5 is blown would the LED on the cable still light up when it connects to the port? Because the ebay cables have a LED that lights up when I connect them to the OBD2 port.
    You are probably right. My guess is if the LED lights, you have power.

  16. #15
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    Fuse 5 is working. Now what? I think that something is up with the obd2 link.
    Anymore suggestions? The deadline for my smog check is near.

  17. #16
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    OK. So I went into one autozone and the wanted me to leave a deposit of $167. I went to another and managed to get a rookie to come out with the scanner to see if it worked on my car before I bought . It worked! It read P0103. That means that if the Scantron linked to my car, it's my scanner . I called the Tech support of my scanner and they want me to try updating the software with the internet. I'm going to try that in a while but meanwhile I'm wondering about P0103. Thats MAF sensor high circuit or something. A while back I tried cleaning it with MAF spray. Does this mean it's no good and I need to buy a new one. Could that be why my idle fluctuates for a second or two when I start the engine then rises to 1600-1800 and stays there?

  18. #17
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    I tried disconnecting the MAF sensor and the idle actually went higher. However I did notice that there was no fluctuation at the start up. Any suggestions?

  19. #18
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    MAF cleaning --- Try this thread:


    How to clean a MAF, the kitchen way.

  20. #19
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    I had previously cleaned it with the MAF cleaner spray from the autoparts store. I'm going to give it one more try. I thought that disconnecting it would bring the idle down though.

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