Mechanics

MY CAR JUST DISCONNECTED WITH SCAN TOOLS

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
Avatar
Fuchen
March 4, 2012.



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.

KHLow2008
Mar 4, 2012.
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

Tiny
Fuchen
Mar 6, 2012.
Pin # 4 is ground, ensure it has continuity to body ground.

Check the ground circuits for the engine and computer.

KHLow2008
Mar 6, 2012.
Yesterday I checked the DLC but just pin#16 have power the other 7
have no power

Tiny
Fuchen
Mar 6, 2012.
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 (+)

KHLow2008
Mar 7, 2012.