![]() These subfunctions vary widely depending on the OEM so you’ll have to poke around to find out which your vehicle supports. Some OEMs have two or three levels of Diagnostics: OBDII/Standard Diagnostics, Reflashing, and Enhanced Diagnostics. This Subfuction tells the ECU which Level of Diagnostics it needs to go into. Start Diagnostics will typically take a Subfunction. So you have to use Service 0x10 – Start Diagnostics. First you must be in a diagnostic mode (not all OEMs require this, but many do). So how does it work? Well it varies a bit from OEM to OEM, but they all typically work the same. ![]() This is the service that validates an application is authorized to do one or more of the privileged functions. This is one of the hard parts that i've been working on.
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