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Home >> Geo >> 1996 >> Prizm Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0500 - Vehicle Speed Sensor (VSS) Circuit >> Circuit Description

Circuit Description

Vehicle Speed Sensor (VSS) is an electronic relay mounted on transaxle. As transaxle rotates VSS, speedometer is provided with a vehicle speed input (voltage pulses). This signal drives speedometer. Speedometer converts vehicle speed input into a more precise waveform, providing PCM and cruise control module with a vehicle speed input. PCM converts this input (ground pulses) into vehicle speed. DTC P0500 will set when vehicle speed input is not sensed at PCM with vehicle speed above 3 MPH.

NOTE: A false DTC P0500 can be set if engine is "brake-torqued" in gear.
CAUTION: Failure to support drive wheels in a horizontal (straight) position with engine running in gear will result in drive axle damage.
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