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1999 Chevy Blazer service engine soon

Tiny
DSPRANGER
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 73,000 MILES
When I plug my scan tool into the diagnostic connection nothing comes up.
I've used the scan tool on my other vehicles and it works fine.
What's the problem?
Friday, June 12th, 2009 AT 7:15 AM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS


https://www.2carpros.com/forum/automotive_pictures/170934_16_pin_data_link_connector_1.jpg



Hello, pin 4 is chassis ground for the scan-tool, pin 16 is power for the scan-tool. If those two pins check out????

Does the mil come on, key on, no crank? I can talk to you about the basics, after that???
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Friday, June 12th, 2009 AT 11:39 AM
Tiny
DSPRANGER
  • MEMBER
  • 4 POSTS
I am not getting any power to the diagnostic plug.
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Tuesday, June 16th, 2009 AT 6:41 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If your not getting any voltage to pin 16, check the fuse and circuit for the cigar lighter, fuse 2-- 15 amp.
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+1
Wednesday, June 17th, 2009 AT 10:34 AM
Tiny
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  • MEMBER
  • 4 POSTS
I checked the fuse and found that it was blown. I replaced the fuse and it blew right away. What now?
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Wednesday, June 17th, 2009 AT 7:00 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Remove the cigar lighter from the socket. Check again, you can use a testlite across the fuse terminals instead of blowing all your fuses. If the lite comes on, the circuit is still grounded, somewhere.
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Thursday, June 18th, 2009 AT 8:02 AM
Tiny
DSPRANGER
  • MEMBER
  • 4 POSTS
I removed the cigar lighter, and used my digital voltmeter on a different set of fuse terminals. It checked out at 12 volts. I then checked the # 2 fuse terminals and I was getting readings all over the place, 300 to 180 to 65 and every number in between. What's next?
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Thursday, June 18th, 2009 AT 6:57 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If you were using the voltage setting on the meter, I don't know how you got those numbers on a 12 volt system? I think you got a short on that circuit somewhere if the lighter element is ok.
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Friday, June 19th, 2009 AT 8:49 AM
Tiny
MR266RAMIREZ
  • MEMBER
  • 3 POSTS
I was having the same problem on my blazer as soon as I disconnected the cigarette light from the wire harness it stopped blowing fuses and read my scan tool.
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Friday, October 16th, 2020 AT 9:04 AM

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