SPONSORED LINKS

OBD port not working

Tiny
LARS KARLSSON
  • MEMBER
  • 2007 MERCEDES BENZ E500
  • 5.5L
  • V8
  • AUTOMATIC
  • 52,800 MILES
Car listed above is a e550. When I plug in my obd scanner iCarsoft 980, the scanner powers up but I cannot read any codes. I get "no system configuration information". Two garages have also tried connecting to the car without success. I checked fuse number 30 which is okay, dashboard - left side.

What steps can I check?
SPONSORED LINKS
Wednesday, May 20th, 2020 AT 11:28 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The one thing I feel can be checked is ground to the DLC. There are two of them, pins 4 and 5. Check for continuity to ground. See pic 1.

Next, what you need to do is scan the system using a can scanner. This will help identify where the break down in communication is located. The can bus (controller area network) is a system used on this vehicle, Basically, it is a network of micro controllers communicate with each other.

Here is a video that explains how this works and how to check it:

https://youtu.be/InIlnsjOVFA

Let me know what you find.

Joe
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, May 20th, 2020 AT 7:22 PM
Tiny
LARS KARLSSON
  • MEMBER
  • 5 POSTS
Okay, I Will check the grounds. Worth mentioning the CEL does not illuminate when during dash self test (key position 2).
Was this
answer
helpful?
Yes
No
Thursday, May 21st, 2020 AT 10:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
You said fuse 30 was good. Did you confirm power to it and out from it?

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Thursday, May 21st, 2020 AT 7:33 PM
Tiny
LARS KARLSSON
  • MEMBER
  • 5 POSTS
I have continuity from both pin 4, 5 to ground.
Was this
answer
helpful?
Yes
No
Friday, May 29th, 2020 AT 11:24 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Okay. I really feel you need to scan the CAN system. Something at some point has broken down and preventing you from getting codes.

I attached the link above for a video. I really feel that is the way you need to go at this point.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, May 29th, 2020 AT 6:10 PM
Tiny
LARS KARLSSON
  • MEMBER
  • 5 POSTS
Someone told me I could measure resistance between pin 6, 14. And should be 60 ohm. I got 49 Ohm. Can you draw any conclusion from this?

I will try get hold of can scanner.
Was this
answer
helpful?
Yes
No
Sunday, May 31st, 2020 AT 8:03 AM
Tiny
LARS KARLSSON
  • MEMBER
  • 5 POSTS
Sorry, I got 70 ohms.
Was this
answer
helpful?
Yes
No
Sunday, May 31st, 2020 AT 8:08 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
No, I'm sorry I can't. The 10 additional ohms of resistance shouldn't cause the OBD to fail.
Was this
answer
helpful?
Yes
No
Sunday, May 31st, 2020 AT 7:04 PM

Please login or register to post a reply.

Related Engine Computer Diagnostic Connector ALDL Content

OBD-II Port Not Working? Check This Out
VIDEO
OBD-II Port Not Working? Check This Out
Instructional repair video

Sponsored links