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Home >> Jeep >> 1993 >> Grand Cherokee Base, 5.2 Y, AWD >> 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)

The VSS generates 8 pulses per axle shaft revolution. PCM interprets speed sensor input along with TPS closed throttle input.

This input enables PCM to determine if a closed throttle deceleration or normal throttle idle (vehicle stopped) condition exists. During deceleration, PCM controls Idle Air Control (IAC) motor to maintain a desired manifold pressure. During idle (vehicle stopped), PCM controls IAC motor to maintain a desired idle speed. PCM also uses VSS signal to maintain set speed during cruise control operation.

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