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Home >> Chevrolet >> 2008 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L DOHC >> Diagnostic Information and Procedures >> DTC P0501 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the VSS.
  2. Ignition ON, test for less than 0.1 volt between the ground circuit terminal A and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Connect a test lamp between the ignition 1 voltage circuit terminal B and ground circuit terminal A.
  4. Command the fuel pump relay ON with a scan tool. Test for battery voltage between the ignition 1 voltage circuit and ground.
    • If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  5. Test for 9-11 volts between the signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. If the voltage is within the specified range, test or replace the VSS.
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