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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0449 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON, engine OFF,
  2. Command the EVAP vent solenoid On (Not Venting) and Off (Venting) with a scan tool.
  3. You should hear the solenoid click when commanded ON and OFF.
    • No clicking heard 

      Refer to Circuit/System Testing below.

    • Clicking is heard 
  4. Engine idling, command the EVAP vent solenoid ON and OFF with a scan tool while observing the following control circuit status parameters:
    • EVAP Vent Solenoid Valve Control Circuit Low Voltage Test Status
    • EVAP Vent Solenoid Valve Control Circuit Open Test Status
    • EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status
    • If the Parameters display Malfunction 

      Refer to Circuit/System Testing below.

    • If the Parameters display OK or Not Run 
  5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing below.

    • If the DTC does not set 
  7. All OK.
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