S6 Wagon L5-2226cc 2.22L DOHC Turbo (AAN) (1995)
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Vehicle Speed Sensor: Description and Operation
The Vehicle Speed Sensor (VSS) -G68- sends a speed signal to the speedometer and from there the signal goes on to the Engine Control Module
(ECM). This speed signal initiates the following control functions:
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Gear recognition, i.e. for A/C compressor cut-out in first gear
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IDLE-to-DRIVE switch-over, i.e. for automatic transmissions, at speeds over 4 km/h (2.5 mph).
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Automatic transmission protection, i.e. under 20 km/h (12.5 mph), stall speed drops to 2900 RPM after 4 seconds
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Speed limiting, i.e. at 210 km/h (130mph).
Self-diagnosis:
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Self-diagnosis (OBD) recognizes the fault "no signal" (Diagnostic Trouble code 1231).
