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Vehicle Speed Sensor & Buffer

  1. Disconnect VSS buffer connector. Turn ignition on. Check voltage at Pink/White wire terminal of VSS buffer connector. If battery voltage is not present, check Pink/White wire between VSS buffer and fuse.
  2. If battery voltage is present, check voltage between Pink/White and Black wire terminals of VSS buffer connector. If battery voltage is not present, repair Black wire between VSS buffer and ground. If battery voltage is present, raise and support vehicle.
  3. Check AC voltage between Purple/White and Light Green/Black wire terminals of VSS buffer connector with drive wheels turning in high gear. If pulsing AC voltage is present, go to next step. If pulsing AC voltage is not present, check Purple/White and Light Green/Black wires between VSS buffer and VSS. If wires are okay, replace VSS.
  4. Check AC voltage between Light Blue/Black and Black wire terminals of VSS buffer connector with drive wheels turning in high gear. If AC voltage is not present, or if AC voltage is present but does not vary with engine RPM, replace VSS buffer.
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