560SL (107.048) V8-5.6L (117.967) (1989)
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Vehicle Speed Sensor: Description and Operation
The vehicle speed sensor which is located in the instrument cluster transmits a vehicle speed signal to the CIS-E control unit and the idle speed control
unit. The idle speed control unit switches engine idle speed control over to air flow control above a vehicle speed of approx. 0.9 mph. This process
improves vehicle driveability at slow stop-and-go speeds (prevents possible bucking). The engine idle speed control is activated once again at vehicle
speeds below 0.9 mph.
