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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0455: Evaporative Emission (EVAP) System Large Leak Detected >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize or produce smoke from a leak.
  • Refer to the GE-41413-A  operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  .
  2. Connect the GE-41413-A  to the vehicle EVAP service port adapter.
  3. Ignition ON, command the EVAP Purge/Seal function to Not Venting or System Seal with a scan tool to seal the EVAP system.
  4. Verify that there is no leak in the EVAP system using the flow meter on the GE-41413-A  , calibrated to 0.51 mm (0.020 in).
    • If a leak is detected 
    1. Apply smoke to the EVAP system at the service access port adapter with the GE-41413-A  .
    2. Locate the leak using the GE-41413-SPT  .
      • When the leak is located, repair or replace the affected component as necessary.
    • If no leak detected 
      NOTE: The steps below test for a restriction in the purge path.
  5. Connect the GE-41413-A  nitrogen/smoke hose to the J-41413-311  or GE-41415-60  for capless vehicles.
  6. Disconnect the hose at the fuel cap end of the GE-41415-30  and connect to the J-41413-311  .
  7. Install the GE-41415-30  or GE-41415-60  , filler neck end only, to the vehicle.
  8. Engine idling, command the Purge/Seal function to Not Venting or System Seal with a scan tool to seal the system.
    NOTE: The scan tool will abort purge when a predetermined value is reached. This is to prevent damage to the fuel tank.
  9. Command the EVAP Purge Solenoid Valve to 10-30% with a scan tool.
  10. Verify the vacuum/pressure gauge on the GE-41413-A  and the scan tool Fuel Tank Pressure Sensor parameter both show vacuum.
    • If the vacuum/pressure gauge shows vacuum but the Fuel Tank Pressure Sensor parameter does not show vacuum 

      Replace the B150 Fuel Tank Pressure Sensor.

    • If both do not show vacuum 

      Repair the restriction in the purge path.

    • If both show vacuum 
  11. Verify that the Fuel Tank Pressure Sensor parameter increases to greater than 3.2 V and the pressure values are similar between the scan tool Fuel Tank Pressure Sensor and the vacuum/pressure gauge on the GE-41413-A  .
    • If not within the specified range 

      Replace the B150 Fuel Tank Pressure Sensor.

    • If within the specified range 
  12. All OK
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