OBD2 port does not want to communicate with any scanner

2001 AUDI TT
130,000 MILES • 1.8L • 4 CYL • 2WD • MANUAL
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MIKHAIL17
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Hi, the OBD2 port on my vehicle doesn’t want to communicate with any scanner.
So far, I already checked all the fuses and everything seems to be good without any break, I reset the ECU but still no link on the scanner. I ended up testing each pins with multi-meter with back probe method and found out that pin 7/ K-line only have .07 Volts running when it suppose to have way more than that. Do you guys know how to trace a short on K-line to ECU. I'm a beginner in electrical experience with car. Any tips and advice will help. Thank you
Nov 3, 2019 at 2:57 AM
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MIKHAIL17
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This is the Pin 7 for K-Line.
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Nov 3, 2019 at 3:00 AM
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MASTERWRENCH
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You are correct, pin 7 is the K-Line diagnostic circuit. The best way to narrow down a short on the network is to start by unplugging modules one at a time to see if communication resumes. Attached are several diagrams showing all the modules on the communication bus along with the locations of these modules in the vehicle.
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Nov 3, 2019 at 7:16 PM
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MIKHAIL17
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Thank you so much sir, you are a legend.
Nov 3, 2019 at 9:42 PM
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MASTERWRENCH
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You're quite welcome!
Nov 4, 2019 at 4:28 AM