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Home >> Chevrolet >> 2007 >> Optra5 LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (LDA) >> Diagnostic Information and Procedures >> DTC P0502 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the VSS.
    2. IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  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 ground.
    • If less than B+, 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 ground.
    • 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 ground.
    • 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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