[quote author=bearda link=topic=76162.msg1374709#msg1374709 date=1177940831]
Very interesting. So you're using something like this:
How is that list of PCM options populated? I know a couple members had mentioned it was possible for Mazda dealers to bump the 118 mph limiter. I'm kind of curious if a tool like yours could do the same.
Yes, that’s one of several J2534 interfaces that are suitable. I bought mine directly from Drew Technology. They are great folks and they have some great products, including a standalone, completely programmable “glass instrument panel” which will be released soon.
The capabilities of the MMP are rather limited and there is no control of your speed parameter. A subscription service with Mazda is required to use the MMP. The MMP has the following abilities –
1 - Update a flash for your specific VIN using a concurrent internet connection for “ET phone home”.
2 - Swap out a PCM or Instrument Cluster (IC) by reading data from the old unit and transferring it to the new unit. In the case of the PCM, the VIN and probably a bunch of other vehicle specific stuff gets transferred. In the case of the IC, the mileage gets transferred to the new unit.
3 - Program additional electronic ignition keys and delete (discontinue) keys.
4 - There are a number of other marginally useful features. You can change the tire size constant to true-up the speedo, but I couldn’t get this to work. Some of the other utility functions are described above.
I believe Mazda logs the important activity against your VIN across the internet connection. I wouldn’t think there would be warranty issues unless you are at fault and screw something up. MMP was provided to allow non-Mazda garages to update and replace the critical electronic modules. I think making this type of limited open toolset available for the mom-and-pop garages is required by commerce law.
It appears you can get the full-boat MMDS / IDS system (Teradyne J2534 VCM Pod and IDS software) which the Mazda garages use for $4K. It comes in laptop and PDA versions. You supply the laptop.