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No communication (OBD2)/no start

Tiny
JOE FRAUENBERGER
  • MEMBER
  • 2003 DODGE RAM
  • 5.9L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 315,000 MILES
There is no power to Obd2 port. The truck cranks but does not start. My gauges (fuel, voltage, oil pressure, water temperature) do not seem to have signal. My overhead, display has power but shows (no Comunication). Any help would be great.
Wednesday, February 7th, 2018 AT 2:37 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Does the check engine light come on with the key on?

Check the fuse for the lighter. It sends power to the port.

Roy
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Wednesday, February 7th, 2018 AT 3:24 PM
Tiny
JOE FRAUENBERGER
  • MEMBER
  • 5 POSTS
All fuses are good. All the lights come on and stay on.
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Saturday, February 10th, 2018 AT 9:29 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Pink wire, terminal 16 of the dlc is fed from fuse 51 in the underhood fuse block.

Make sure there is power on both sides of the fuse.

Roy
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Saturday, February 10th, 2018 AT 12:26 PM
Tiny
JOE FRAUENBERGER
  • MEMBER
  • 5 POSTS
There is power to data link connector. Used three separate scan tools. No communication.
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Sunday, February 11th, 2018 AT 4:53 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to test the fuse in the diagram for power on both sides. If you have power the wire is broken between the connector and the fuse block.
If you have no power the issue is at the fuse block.

Roy
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Sunday, February 11th, 2018 AT 2:08 PM
Tiny
JOE FRAUENBERGER
  • MEMBER
  • 5 POSTS
The wire is good the fuse box is good. There is power on both ends of fuse. What computer does the scan tool communicate with?
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Sunday, February 11th, 2018 AT 5:17 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
So there is no power to pin 16 of the OBD port?

It communicates with all the modules through the serial data lines.

Roy
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Sunday, February 11th, 2018 AT 5:25 PM
Tiny
JOE FRAUENBERGER
  • MEMBER
  • 5 POSTS
There is power, but no comunication to pin 16 ordered a new ecm, will see if it fixed it
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Sunday, February 18th, 2018 AT 7:24 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If there is no power to pin 16, it will not communicate. That power is provided by the fuse block as I stated before. The pcm has no control over the power to pin 16. That powers up your device you are using to communicate.

Roy
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Sunday, February 18th, 2018 AT 7:33 AM

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