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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0335 - P26C8) And Symptoms) >> 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 .
NOTE:

This vehicle has a capless fuel fill design that requires the use of CH-44284-2  to hold the two flapper valves open.

  • Install this tool so that the raised rib nests just inside the flapper door outer lip. The flappers will hold it in place.
  • Be careful the force of the flapper doesn't push the tool back out.
  • Do not insert tool any further into the fuel neck or it may get stuck or fall into the lower fill tube.
NOTE:

The GE-41415-60  is a dual purpose tool used for EVAP testing and diesel induction leak testing. It has two positions for the rubber stopper, identified on the tube by a letter A and B. Slide the stopper to just above either line depending on the test performed.

  • Letter A position line is for diesel induction leak testing
  • Letter B position line is for EVAP testing
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the Q12 Evaporative Emission Purge Solenoid Valve. Install the CH-48096  between the disconnected purge tube and the purge solenoid valve.
  2. Connect the GE-41413-A  to the CH-48096  .
  3. Ignition ON, command the EVAP Purge/Seal function to Not Venting or System Seal with a scan tool to seal the 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 CH-48096  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.
    • Go to next step: If no leak detected 
      NOTE:

      The steps below test for a restriction in the purge path.

      NOTE:

      Install the GE-41415-60  , with the tube pointing toward the ground, into the capless fuel fill opening. Wedge the stopper into the opening with just enough force to retain this tools threaded end pointing out, parallel within the opening.

  5. Install the GE-41415-60  into the capless fuel fill opening.
  6. Connect the GE-41413-A  nitrogen/smoke hose to the GE-41415-60  .
  7. 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.

  8. Command the EVAP Purge Solenoid Valve to 10-30% with a scan tool.
  9. 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.

    • Go to next step: If both show vacuum 
  10. 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.

    • Go to next step: If within the specified range 
  11. All OK.
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