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: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

Test for a blockage or restrictions in the EVAP system components listed below and repair as necessary.
- Evaporative Emission Vent System Hoses
- Evaporative Emission Canister
- Q13 Evaporative Emission Vent Solenoid Valve
- Evaporative Emission Vent Filter
Reconnect all previously disconnected EVAP hardware.
NOTE: Refer to the GE-41413-A operation manual for detailed instructions in Evaporative Emission System Diagnosis .
Remove the fuel fill cap and connect the CH 41415-30 to the fuel tank filler neck. Connect the GE 41413-A to the CH 41415-30.
Command the EVAP Purge/Seal function to Not Venting or System Seal with a scan tool to seal the EVAP system.
Turn the nitrogen/smoke valve on the GE 41413-A to nitrogen.
NOTE: DO NOT exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.
Use the remote switch to activate the GE 41413-A and pressurize the fuel tank to 1.24 kPa (5.0 in H20).
Verify the scan tool Fuel Tank Pressure Sensor parameter is 0 kPa (0 in H20) when commanding the EVAP Vent Solenoid Valve to OFF.
- If not 0 in H20
  Test for a blockage or a restriction in the EVAP vent hose or inlet. If the inlet or hose test normal, replace the Q13 Evaporative Emission Vent Solenoid Valve.
- Go to next step: If 0 in H20
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.
- If the DTC sets
  Refer to step 1 above.
- Go to next step: If the DTC does not set
All OK.