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Speed, lead from ABS

Speed, lead from ABS





The ABS control module sends a speed signal to pin 68 on the EDC 15 control module. The signal is a square wave that alternates between 0v and B+ 29 times per wheel revolution. The signal is used to:


determine the gear currently engaged. This ensures the engine receives the correct amount of fuel in different gear positions when the accelerator pedal is released.

provide an impulse for cruise control.




Diagnostics


If there is no speed signal, diagnostic trouble code P0502 will be generated.

If the speed signal exceeds 220 km/h, diagnostic trouble code P0500 will be generated.

The speed (bus from MIU) is used as a substitute value.


System reaction to a fault

Cruise control is blocked.