MY CAR JUST DISCONNECTED WITH SCAN TOOLS

  • Tiny
  • Fuchen
  • 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 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,938 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

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
  • Expert
  • 41,938 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

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
  • Expert
  • 41,938 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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