Access MS CAN Bus with FORScanV2 and modified ELM327

Many Ford and Mazda models (approximately since 2003-2004) is equipped with MS CAN bus, in addition to the regular HS CAN Bus. In contrast to HS can bus, MS can bus isn't supported by the stock ELM327, because Ms can is a manufacturer-specific solu tion and located on non-obd2 pins. However, ELM327 is very flexible tool, and small modification allows to implement the MS CAN support.

Note before you read further:since version 2.1.0 Forscan supports the STN11XX chip with a built-in Ms-can bus su Pport (Example of adapter Implementation:obdlink MX, ELS27). So it is better choice for people who wouldn ' t like to modify anything by their own hands.

Note for Mondeo Mk3 owners:only models after restyling in July 2003 has Ms-can modules. And this bus is keeps few modules like ACM and EATC. You don't need the Ms-can modification to access engine, ICU and all other modules except ACM and EATC.

This article contains of 2 parts:how to modify ELM327 in order to add the hs/ms CAN switch, and some notes about MS can s Upport in Forscan v2.

Note: If Forscan doesn ' t ask you about HS/MS can switch (see Chapter 2 below), it means it doesn ' t suspect MS CAN modules on the Board and won't check for them, even if you modify the ELM.

1. How to modify ELM327 in order to add the hs/ms CAN switch

ELM327 supports HS can from the stock, because Ford HS can completely matches to the OBD2 standards. It occupies pins 6 and 14. MS CAN Bus occupies pins 3 and 11. The picture below illustrates the thing (Attenion:the OBD2 Jack in the picture means vehicle one, "female". The adapter ' s one is "male" and so it's "mirrored". Pins is often mixed up because of this. Always note pins ' numbering of the adapter ' s jack!):

The simplest-to implement-MS can support are to add a switch that'll shift between MS/HS CAN. The scheme below explains the modification (attenion:the OBD2 jack on the picture means vehicle one, "female". The adapter ' s one is "male" and so it's "mirrored". Pins is often mixed up because of this. Always note pins ' numbering of the adapter ' s jack!):

Roadmap:
Purchase a 6 pin mini-switch of on-on type (for example, MTS-202-A2) in any shop that sells electronic components, also p Repare a Wire

disassemble ELM327 (for majority of China clones-carefully remove the label that hides 4 screws, unscrew them)
find a place for the Mini-switch (most complex part of the whole operation for some devices, that is extremely compact)
Unsolder wires from pins 6 and in the OBD2 jack and solder them to the 2 middle pins of the Mini-switch
Solder 2 new wires from 2 outer mini-switch pins to pins 6 and in the OBD2 jack
Solder 2 Other new wires from 2 other outer mini-switch pins to pins 3 and one of the OBD2 jack
Check the work (it's very important to does not mix can-l and can-h wires up!) and assembly the ELM327, mark the MS and HS Can position on the device box to avoid confusion
Example of the modification:

2. Forscan V2 MSCAN Support

Forscan V2 has a support of MS can bus and optimized for using the HS/MS can switch. There is no necessity to adjust any ELM327 parameters for MS CAN, Forscan makes all the necessary changes in an automated Mode. When Forscan establishes a vehicle connection, it analyses the vehicle configuration. If MS can modules is expected, Forscan would ask user about Hs/ms CAN switch:

If no question is asked, it means Forscan doesn ' t expect a presence of MS CAN and are not going to look for it. If user confirms the MS/HS switch presence, Forscan'll ask user to shift the bus, for example:

Forscan v2 is optimized for using the HS/MS CAN switch (minimize number of necessary shifts). For example, reading DTCs in all of 5 HS can modules and 2 MS can modules would always require only 1 shift.

Access MS CAN Bus with FORScanV2 and modified ELM327