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Home >> Chevrolet >> 2010 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0192 To DTC P0629/P062B >> DTC P0449, P0498, or P0499 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the Q13 EVAP vent solenoid valve harness connector.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal B and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
  3. Ignition OFF, connect a test lamp between the control circuit terminal A and the ignition voltage circuit terminal B.
    4. NOTE: The control circuit for the EVAP vent solenoid valve is pulled-up to voltage within the ECM, 2.6-4.6 volts on the control circuit is normal.
  4. Ignition ON, command the scan tool EVAP vent solenoid valve ON and OFF. The test lamp should turn ON and OFF.
    • If the test lamp remains ON all the time, test the control circuit for a short to ground. If circuit/connections test normal, replace the K20 ECM.
    • If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If circuit/connections test normal, replace the K20 ECM.
  5. Test for 2.6-4.6 V between the control circuit terminal 2 and ground.
    • If not within the specified range, replace the K20 ECM.
  6. If all circuits/connections test normal, test or replace the Q13 EVAP vent solenoid valve.
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