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OBD2 port does not want to communicate with any scanner

Tiny
MIKHAIL17
  • MEMBER
  • 2001 AUDI TT
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 130,000 MILES
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
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Sunday, November 3rd, 2019 AT 2:57 AM

4 Replies

Tiny
MIKHAIL17
  • MEMBER
  • 3 POSTS
This is the Pin 7 for K-Line.
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Sunday, November 3rd, 2019 AT 3:00 AM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
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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Sunday, November 3rd, 2019 AT 7:16 PM
Tiny
MIKHAIL17
  • MEMBER
  • 3 POSTS
Thank you so much sir, you are a legend.
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Sunday, November 3rd, 2019 AT 9:42 PM
Tiny
MASTERWRENCH
  • MECHANIC
  • 258 POSTS
You're quite welcome!
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Monday, November 4th, 2019 AT 4:28 AM

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