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



    • 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.


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