My car just disconnected with scan tools

1997 JEEP GRAND CHEROKEE
200,000 MILES
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FUCHEN
  • MEMBER
  • 3 POSTS
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
Mar 3, 2012 at 11:03 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 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.
Mar 3, 2012 at 11:50 PM
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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
Mar 6, 2012 at 1:16 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Pin # 4 is ground, ensure it has continuity to body ground.

Check the ground circuits for the engine and computer.
Mar 6, 2012 at 4:53 AM
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FUCHEN
  • MEMBER
  • 3 POSTS
yesterday i checked the DLC but just pin#16 have power the other 7
have no power
Mar 6, 2012 at 10:30 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 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 (+)
Mar 7, 2012 at 4:20 AM
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