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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 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 car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
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 Q12 Evaporative Emission Purge Solenoid Valve and install the CH-48096  .
  2. Connect the GE-41413-A  to the vehicle EVAP service port adapter.
  3. Command the EVAP Purge/Seal function to System Seal or Not Venting 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.
    • Go to next step: 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 System Seal or Not Venting with a scan tool to seal the system.
  9. Command the EVAP Purge Solenoid Valve to 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.

    • Go to next step: 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.

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