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hihorn
Samba Member
Joined: March 20, 2006
Posts: 23
Location: California
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 Posted: Thu Apr 25, 2024 9:50 pm Post subject: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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this Jetta has been all over Los Angeles to top shops trying to find out why scanners cannot retrieve codes from the car. It won't pass emissions because the testers cannot connect to the car. The scanners light up, but after a long time, scanner say's it can't connect. HELP!
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82 Diesel Westy, Turbo Charged, ground up restoration. |
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kamzcab86
Samba Moderator
Joined: July 26, 2008
Posts: 8357
Location: Arizona
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| Posted: Fri Apr 26, 2024 2:19 pm Post subject: Re: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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Does this car have an aftermarket radio installed?
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~Kamz 
1986 Cabriolet: www.Cabby-Info.com
 1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"Real knowledge is to know the extent of one's ignorance." - 孔子 |
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hihorn
Samba Member
Joined: March 20, 2006
Posts: 23
Location: California
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| Posted: Fri Apr 26, 2024 4:01 pm Post subject: Re: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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It did have a Pioneer head unit for years. The Yellow and red "K" wire has been cut, but still wont read. We are using a top of the line Snap-on Code reader and a lap top with the same results.
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82 Diesel Westy, Turbo Charged, ground up restoration. |
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kpf
Samba Member
Joined: March 01, 2017
Posts: 1058
Location: California, US
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| Posted: Fri Apr 26, 2024 4:09 pm Post subject: Re: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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If the car runs and drives fine, the ECU itself is probably fine. Maybe you have to inspect and test the wiring & connectors from the OBD connector to the ECU.
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kamzcab86
Samba Moderator
Joined: July 26, 2008
Posts: 8357
Location: Arizona
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| Posted: Fri Apr 26, 2024 7:35 pm Post subject: Re: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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| hihorn wrote: |
| It did have a Pioneer head unit for years. The Yellow and red "K" wire has been cut, but still wont read. |
The K-line should be gray/white and cut (and taped) at the radio-end of the harness.
If the K-line has indeed been cut, then apparently other modules in the car can be causing the issue, including the instrument cluster.
https://www.vwvortex.com/threads/k-line-hold-up.8674433/
_________________
~Kamz
1986 Cabriolet: www.Cabby-Info.com
1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"Real knowledge is to know the extent of one's ignorance." - 孔子 |
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hihorn
Samba Member
Joined: March 20, 2006
Posts: 23
Location: California
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| Posted: Sat Jun 15, 2024 3:09 pm Post subject: Re: 2002 MK4 Jetta - OBD will not "Talk" to Scanner |
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I am looking under the dash for the "pig tail" where all the "K" wires meet. Can anyone tell me where to look for this. There are several videos on line, but they are from an Audi or a VR6 Golf. They seem completely different under the dash. Or, can anyone point me to a shop in the Los Angeles area who has actually done this before?
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82 Diesel Westy, Turbo Charged, ground up restoration. |
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