DTC P0500: Vehicle Speed Sensor Malfunction: Reference
WARNING: This page is about a different car, the 2003 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
Test VSS with an oscilloscope by backprobing at ECM. Connect oscilloscope between ground and ECM harness connector G04 terminal No. 27 (Purple wire). See Figure. Compare VSS waveform, to waveform in illustration. See Fig 1.
Courtesy of SUZUKI OF AMERICA CORP.