OBD2 not communicating

Tiny
JOSE4465
  • MEMBER
  • 1999 ISUZU NPR
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 279,000 MILES
OBD2 not communicating with the computer. It has power and grounds just to communicating wire not working.
Saturday, February 16th, 2019 AT 10:43 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,642 POSTS
Hello,

Can you make sure #16 terminal has power? Here is a guide to help and the engine wiring diagrams below so you can see how the system works. Does the scanner work on other cars?

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what you find.
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Monday, February 18th, 2019 AT 11:30 AM

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