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Vehicle Speed Sensor (VSS)

  1. If speedometer operates, VSS is okay. If speedometer does not operate, disconnect electrical connector from VSS. Remove VSS. Connect battery positive lead to terminal No. 1 and negative lead to terminal No. 2. See Fig 1.
  2. While rotating gear, measure voltage between terminals No. 2 (negative lead) and No. 3 (positive lead). Replace VSS if voltage does not alternate between zero and 12 volts, 4 times per revolution.
  3. Disconnect VSS connector. Check voltage at VSS connector terminal No. 1. Voltage should not exist. Turn ignition on. Voltage should exist. If voltage is not as specified, repair wiring.
Fig 1: Identifying Terminals Of Vehicle Speed Sensor (VSS)
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