SPONSORED LINKS

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
  • 41,814 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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
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
Was this
answer
helpful?
Yes
No
Tuesday, March 6th, 2012 AT 9:16 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Pin # 4 is ground, ensure it has continuity to body ground.

Check the ground circuits for the engine and computer.
Was this
answer
helpful?
Yes
No
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
Was this
answer
helpful?
Yes
No
Tuesday, March 6th, 2012 AT 6:30 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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 (+)
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, March 7th, 2012 AT 12:20 PM

Please login or register to post a reply.

Related Check Engine Light Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE

Sponsored links