Hi,

I have Audi a4 b6 1.9tdi, 2002y. ECU not receiving vehicle speed signal (VCDS: engine block, channel 006, and i think 24 or 33 can't remember now), but detects RPM. For example: Instrument Cluster or Climate control unit receiving vehicle speed without problem.

As far as I know, ECU receiving speed signal from Instrument cluster, so does it come through separate wire, or through CAN? Can not find any good wiring diagram for this.