ODBii port powers reader, but won't connect

Discussion in 'Electronics' started by MancMike, Dec 20, 2016.

  1. MancMike

    MancMike Hardcore MB Enthusiast

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    Hi,

    Breaking off from this thread, my two ODBii scanners both exhibit the same issue.

    One is a wifi reader that connects to my phone. The phone connects to the reader no problem, but I get error messages that it cannot read the interface.

    The other is a handheld reader, again it gets powered up, but can't detect the correct protocol. It has worked in the past...

    Any idea why my ODBii port might power the devices, but not connect?
     
  2. grober

    grober MB Club Veteran

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  3. OP
    OP
    MancMike

    MancMike Hardcore MB Enthusiast

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    Hi, Thanks.

    It does power them though? That's all it does. Also, the ODB port doesn't have all 16 pins. Behind the port, the cable and plug that goes to it only occupies about 4 pins, but I'll double check, get pictures etc.

    Will try my readers on her Insignia.

    Thanks.
     
  4. bob6600

    bob6600 Hardcore MB Enthusiast

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    Check all your fuses. I had a similar fault on my W210, it was detected but could not connect to any ECU. A fuse that supplied the 12v to it was blown.
     
    1 person likes this.
  5. PobodY

    PobodY Hardcore MB Enthusiast

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    Check your ignition key position. - I know my OBD reader can sometimes say that it can't read anything, then I turn the key one more stop and suddenly it can find the car after all.
     

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