Originally Posted by
Snipesy
So on CAN...
If there is a way to control the mode it would be done with the quote unquote 'Device Control'. Which for the LML's ECM would be a command that looks like 7E0 08 AE aa bb bb bb bb bb, where AE is the mode, aa is the the control mode, and the bbs are the data for that control.. Also the length is always going to be 8 bytes, because Bosch. You know it did something if you didn't get a 7F.
Additionally you will need to send this to to the ECM about once every .5 seconds or so, else nothing will work. 7E0 01 3E(just the ecm), or 101 FE 01 3E (everything).
Also sending 7E0 02 10 02 or 101 FE 02 10 02 after you start sending the 3E would be a good idea as well. When you send the 3E signal trouble codes get disabled among a bunch of things, the 10 signal will undo most of that.
I doubt the ECM listens for a mode change on anything other than 7E0 08 AE blah blah blah. Wouldn't make sense really. They use this same system in the OEM tuning of the engine.