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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0502: VSS Circuit - Low Input (A/T) >> Description

DTC P0502: VSS Circuit - Low Input (A/T): Description

WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.

Output Speed Sensor (OSS) produces an AC voltage of different amplitude and frequency depending on the velocity of the output shaft. OSS produces signal from 16 evenly spaced machined notches on transaxle final drive assembly. OSS produces a readable AC voltage signal when speed is more than 3 MPH. OSS signal is sent to PCM, which is used to determine vehicle speed. DTC sets when PCM does not detect an OSS signal for a certain length of time.

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