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Home >> Chevrolet >> 2006 >> Epica LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.0L (L34 GMDAT) - DTC P0137 To DTC P1171 >> DTC P0502 >> Circuit/System Testing

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 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 volts between the VSS ground circuit and the negative terminal of the battery.
    • If greater than 0.1 volts 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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