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Home >> Saturn >> 2000 >> LW1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0502: VSS Circuit - Low Input (M/T With Abs) >> Circuit Description
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Circuit Description

PCM receives vehicle speed signal from Electronic Brake/Traction Control Module (EBTCM). Signal is a square wave based on the AC signal generated by the right front wheel speed sensor. PCM provides a 5-volt pull-up and EBTCM pulls VSS output to ground to generate the signal.

DTC will set if vehicle speed signal is less than 2 MPH for 5 seconds when engine speed is 1700-3600 RPM, TP is less than one percent and engine vacuum is 70-80 kPa.

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