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My car just disconnected with scan tools

Tiny
FUCHEN
  • MEMBER
  • 1997 JEEP GRAND CHEROKEE
  • 200,000 MILES
My jeep drives good. Everthing works good.
But the engine light sometimes on sometime off
I just installed an new computer but still disconnect with scan tools
Does someone can help
Sunday, March 4th, 2012 AT 7:03 AM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
If you cannot communicate with the ECM, it could be a fault with the power supply to the DLC. Ensure you have battery voltage at pin # 16.
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Sunday, March 4th, 2012 AT 7:50 AM
Tiny
FUCHEN
  • MEMBER
  • 3 POSTS
Thank u for helping me?I just checked the DLC the pin#16 is working but still disconnect with scan tools can u please help me again thanks
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Tuesday, March 6th, 2012 AT 9:16 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Pin # 4 is ground, ensure it has continuity to body ground.

Check the ground circuits for the engine and computer.
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Tuesday, March 6th, 2012 AT 12:53 PM
Tiny
FUCHEN
  • MEMBER
  • 3 POSTS
Yesterday I checked the DLC but just pin#16 have power the other 7
have no power
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Tuesday, March 6th, 2012 AT 6:30 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Which engine do you have?

What did you use to check the DLC? You must only use a DVOM to test.

Pin # 16 has battery voltage.
Pin # 4 is body ground, you would not gat any power there.
Pin # 3 is CCB (+)
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Wednesday, March 7th, 2012 AT 12:20 PM

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