SSM2 via Serial

Application Layer

For an introduction to SSM2 see this RomRaider page. Does not cover advanced details though.
Tutorial shows working with a J2534 capable device using free generic software tool: Manual Serial Connection Tutorial.

Physical Layer

SSM2 works with serial (K-) line. This protocol looks like modified ISO 14230/KWP2000. Seems to be used by Subaru only.
SSM2 needs bidirectional serial communication on a single line called the K-line (pin 7 on the OBD-II-connector). L-Line (pin 15) ist not being used, as wakeup apparently is not required on SSM2 control units.

OBD-II (J1962 spec) female connector, often found below steering wheel:

 ____________________________________
 \  1   2   3   4   5   6   7   8   /
  \ 9   10  11  12  13  14  15  16 /
   \______________________________/

2 responses to “SSM2 via Serial

  1. Can I use a dpf service tool to reset the dpf when I’ve completed an oil change on my 2010 (MY09) subaru impreza 2.0 boxer diesel? Thank you for any information you can provide

    Mark

    Like

    • In your case, Euro 4 vehicle, you have to use SSM2 via Serial (= K-Line).
      See post Oil Dilution Reset (K-Line, Euro 4).
      There are many different OBD interfaces using different interface protocols (direct serial, J2534, ELM).
      For K-Line, a cheap serial converter (dumb device, not CAN-capable) is enough. Supported by RomRaider would be ideal. Otherwise depends on your skills – opening serial port using free terminal app, sending and receiving bytes etc.
      Some tuning suites (i.e. EcuTek ProECU) also come with a tool app in order to do some of these maintenance operations.
      Personally, I use my own tools, so not sure if there is anything else available out there supporting Subaru diesel.

      Like

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