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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the VSS.
  2. Connect a test lamp between the ignition voltage circuit and ground circuit of the VSS.
  3. Ignition ON, test for battery voltage between the ignition voltage circuit and the negative terminal of the battery.
    • If less than battery voltage, repair the ignition voltage circuit for a short to ground, or an open/high resistance.
  4. Ignition ON, test for less than 0.1 volt between the VSS ground circuit and the negative terminal of the battery.
    • If greater than 0.1 volt repair the ground circuit for an open/high resistance.
  5. Ignition ON, test for 9-11 volts between the signal circuit of the VSS and the negative terminal of the battery.
    • If less than 9 volts test the VSS signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than 11 volts test the VSS signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. If the voltage is within the specified range replace the VSS.
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