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Home >> Dodge and Ram >> 1998 >> Durango 5.2 Y, Part Time >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 5.2L >> Computerized Engine Controls >> Input Devices >> Vehicle Speed Sensor (VSS)

Vehicle Speed Sensor (VSS)

VSS generates 8 pulses per sensor revolution. VSS input is used by PCM to determine vehicle speed and distance traveled, and to maintain set speed during cruise control operation.

PCM interprets speed sensor input along with TP sensor closed throttle input. This enables PCM to determine if a closed throttle deceleration or normal throttle idle (vehicle stopped) condition exists. During deceleration, PCM controls IAC motor to maintain a desired MAP value. During idle (vehicle stopped), PCM controls IAC motor to maintain a desired idle speed.

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