Hi there,

Odometers are not part of the Base OBD2 spec, but may be part of J2178 or J2190 (from the SAE - I dont have these documents yet). However, most odometers actually record the odometer value from the speed pulse sensor and store it internally on the dial itself, away from the OBD2 bus and ECU.

There may be a seperate Odometer reading that is part of the ECU, but if the ECU was swapped out or changed for a new one, this would then be disparate to the dashboard reading.

Some higher end cars (such as Mercedes) may well store the Odometer reading on the ECU module itself as recent models are heavily reliant on computers. It is down to the manufacturer whether or not they implemented that function, and also implemented it in a manner that follows some standard that I can get my hands on and then implement in Torque

Hi there

has anyone found any further information regarding this and how, even if only for a limited set of vehicles, we can read an odometer value ?

For example I found this reference online:

US-spec 2008 Mazdaspeed 3
https://docs.google.com/spreadsheet/ccc?key=0Ar4cjI7d0yP2dGRPUjZaZGo5MDU2TnpZTXl4blhUbVE&hl=en_US#gid=0

MessageID Bytes Desc Notes
0x4f2 1,2 Odometer in kms

how do I convert these values for use in torque ?

thanks

Hi

Those are general canbus messages - not messages where you ask for data but generally 'broadcast' messages

The mode the adapter is in during normal OBD2 use, you don't get to see those kinds of messages - what you need to do is find the extended PIDs & header that lets you ask the module directly for that message (this is the best way to do things)

It's possible to use ATMA in Torque to get the canbus readings - it's how the harley davidson protocol support works (but that's on a fairly quiet canbus and prevents the 'normal' PIDs from being used as 'ATMA' is read-only for the duration of it's use) Also, the ms3 canbus could be quite busy and you have to parse a lot of data to get the bits you want

How about just a tripmeter, that should be easy ?