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Need advice on diagnostics connector & software

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  • Need advice on diagnostics connector & software

    I'm looking for some advice on the diagnostics connector for my 2013 vintage 7. There is an OBD II diagnostics connector, but I understand that its not compliant with the ODB standard and it only supports the CAN standard.

    Does anyone know the wiring map from this ODB II to a CAN connector?

    My ECU is an MBE with a Caterham p/n 30L152A.

    I was thinking of downloading the free Easimap 6 software from SBD motorsports, it also looks like they sell a USB to CAN cable. Is anyone familiar with this?

    Lastly, I live in the mountains at 6000 feet altitude, so we have lower air pressure. Any advice on engine tuning for driving at altitude?

    ......Dave.

  • #2
    Originally posted by FerneyO View Post
    I'm looking for some advice on the diagnostics connector for my 2013 vintage 7. There is an OBD II diagnostics connector, but I understand that its not compliant with the ODB standard and it only supports the CAN standard.

    Does anyone know the wiring map from this ODB II to a CAN connector?

    My ECU is an MBE with a Caterham p/n 30L152A.

    I was thinking of downloading the free Easimap 6 software from SBD motorsports, it also looks like they sell a USB to CAN cable. Is anyone familiar with this?

    Lastly, I live in the mountains at 6000 feet altitude, so we have lower air pressure. Any advice on engine tuning for driving at altitude?

    ......Dave.
    I have the SBD CAN to USB bit, have been using it, and it works just fine.

    Please read this to see how you are limited w/w the Caterham MBE ECU. The pertinent information is shown just below the description of the MBE-MAP-KIT-4-CAN. You won't be able to modify much, according to the information shown there.

    For the record, the 9A4 that SBD sells has an input for barometric pressure. But a sensor is required of course. I don't know whether any of that (hardware or software) is included in CC's default configuration.
    Chris
    ------------
    A day you don't go a hundred is a day wasted

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    • #3
      Ah. Finally something I can talk about with something like authority.

      The OBD-II connector has two CAN pins as shown on the right hand side:



      You need to connect the OBD-II (on the right) pins 6 (Can Hi), 14 (Can Lo), and 5 (Gnd) to your DB9 connector (on the left).

      Note that need to match the pinout of your DB9 female connector at the other end of the cable to the DB9 male pinout of your SBD USB-CAN dongle that moose refers to in his post. The DB9 pinout above is most likely incorrect.
      This link shows what looks like the right conversion: http://www.bloominglabs.org/images/7/78/Db9-types.png

      Please double check with the SBD USB - CAN dongle documentation for correctness.

      Also you must put a 120 ohm terminating resistor between Can Hi and Can Lo, as is shown here:

      One of the resistors is pre-installed the SBD USB-CAN dongle, but the second one must be put in place by you. Nothing will break if you don't do this, but you will not be able to transmit a single byte of data.

      This is a lot of information - please reply to this if you need clarifications.

      /Magnus F.

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