Fast diagnostics enable/disable
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Enabling/disabling fast diag
By default fast diag is always enabled and streaming data, if you want to disable it (for example you want to use VCDS for pulling codes or diagnose another module), hold the throttle WOT while turning the ignition on. After that until you turn the ignition off the fast diag will be disabled and normal communication protocol will be active.
There will be 2 faults logged - Engine Speed signal, which is widely known as being normal when the engine is off, and also Throttle switch. This happens on a stock ecu also, if you turn the ignition on with the pedal to the floor.