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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?
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Wednesday, May 20th, 2020 AT 11:28 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 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
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Wednesday, May 20th, 2020 AT 7:22 PM
Tiny
LARS KARLSSON
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  • 5 POSTS
Okay, I Will check the grounds. Worth mentioning the CEL does not illuminate when during dash self test (key position 2).
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Thursday, May 21st, 2020 AT 10:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
You said fuse 30 was good. Did you confirm power to it and out from it?

Let me know.

Joe
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Thursday, May 21st, 2020 AT 7:33 PM
Tiny
LARS KARLSSON
  • MEMBER
  • 5 POSTS
I have continuity from both pin 4, 5 to ground.
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Friday, May 29th, 2020 AT 11:24 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 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.
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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.
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Sunday, May 31st, 2020 AT 8:03 AM
Tiny
LARS KARLSSON
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  • 5 POSTS
Sorry, I got 70 ohms.
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Sunday, May 31st, 2020 AT 8:08 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
No, I'm sorry I can't. The 10 additional ohms of resistance shouldn't cause the OBD to fail.
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Sunday, May 31st, 2020 AT 7:04 PM

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