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Speed, lead from ABS

Speed, lead from ABS


The ABS control module sends a speed signal to the PSG 16 control module on pin K34. This signal is a square wave that varies between 0 V and B+ 29 times per wheel rotation. The speed signal is used to:


determine which gear is currently in use. This makes it possible for the engine to receive the correct fuel quantity at different gear positions when the accelerator is released.

Give impulses to cruise control.

activate speed limitation by choking fuel quantity/combustion at 225 km/h





Diagnosis


If the speed signal exceeds 220 km/h, is constantly high/low or is incorrect, DTC P0500 is generated.



System reaction to a fault

Cruise control is switched off.

ACC is switched off.

Speedometer is not operational.