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Home >> Saturn >> 1997 >> SW2 Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - Mp6 & Mp7 >> Diagnostic Testing >> DTC P0721: Vehicle Speed Sensor Signal Noise >> Circuit Description

Circuit Description

PCM detects vehicle speed by counting pulses from Vehicle Speed Sensor (VSS). PCM can detect incorrect input signals (noise) by comparing input value to normal data in memory.