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:
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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.
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give impulse to the cruise control.
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activate speed limitation by choking fuel quantity/combustion at 225 km/h
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| Diagnostics |
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If the speed signal exceeds 220 km/h, is constantly high/low or is incorrect, DTC P0500 is generated.
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System reaction to a fault
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Cruise control is switched off.
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ACC is switched off.
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Speedometer is not operational.
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