300E 4MATIC (124.230) L6-3.0L (103.985) (1990)
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Vehicle Speed Sensor: Description and Operation
CIS-E Control
The vehicle speed sensor which is located in the instrument cluster transmits a vehicle speed signal to the CIS-E control unit. The CIS-E 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.
