Circuit/System Testing

Leak Testing

NOTE:
• You must start with the Circuit/System Verification before proceeding with Circuit/System Testing.
• Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. The system flow will be less with higher temperatures.
1. Connect the J-41415-30:  Adapter to the fuel tank filler neck. Connect the J 41413-200:  EEST to the J-41415-30:  Adapter.
2. Connect the CH-48096:  Access Tool between the Q12 EVAP purge solenoid valve and the EVAP purge pipe.
3. Turn the nitrogen/smoke valve on the control panel to SMOKE.
4. Command the Q13 EVAP vent solenoid valve closed with a scan tool.
5. Use the remote switch to introduce smoke into the EVAP system.
6. Use the J 41413-VLV:  Fitting Tool to open the EVAP service port. Once smoke is observed, remove the J 41413-VLV:  Fitting Tool.
NOTE: Introduce smoke at 15 s intervals while testing the system.
7. Verify that smoke is not exiting the entire EVAP system with the J 41413-SPT:  White Light.
   NOTE: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
   • If smoke is observed, repair the condition as necessary.
8. Remove the J 41413-200:  EEST nitrogen supply hose from the J-41415-30:  Adapter, and remove the J-41415-30:  Adapter from the filler neck.
9. Install the fuel fill cap.
10. Connect the J 41413-200:  EEST nitrogen/smoke supply hose to the EVAP service port of the CH-48096:  Access Tool.
11. Command the Q13 EVAP vent solenoid valve closed with a scan tool.
12. Use the remote switch to introduce smoke into the EVAP system.
NOTE: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
13. Verify that smoke is not exiting the entire EVAP system with the J 41413-SPT:  White Light.
    • If smoke is observed, repair the condition as necessary.
14. Verify individual EVAP system components do not leak using the J 41413-300:  Kit.
    • If a condition is found replace the affected component.

Blockage/Restriction Testing

1. Connect the J-41415-30:  Adapter to the fuel tank filler neck. Connect the J 41413-200:  EEST to the J-41415-30:  Adapter.
2. Seal the EVAP system using the scan tool EVAP Purge/Seal function.
3. Pressurize the EVAP system with nitrogen to 9.33 mm/Hg (5 in/H2O). Compare the scan tool Fuel Tank Pressure Sensor parameter to the J 41413-200:  EEST pressure/vacuum gauge. Verify the scan tool FTP sensor parameter is within +/-0.9 mmHg (+/-0.5 in. H2O) of the pressure/vacuum gauge.
   • If not within the specified range, replace the B150 FTP sensor.
4. Command the Q12 EVAP purge solenoid valve to 100 % with a scan tool. Verify the scan tool FTP sensor parameter is -0.9 to +0.9 mmHg (-0.5 to +0.5 in.H2O).
   • If greater than the specified value, disconnect the EVAP pipes listed below one at a time while observing the scan tool FTP sensor parameter. If the FTP sensor parameter drops to within the specified range when a pipe is disconnected, repair the blockage or restriction in one of the following EVAP pipe/hoses:
     • EVAP purge vacuum source from the Q12 EVAP purge solenoid valve
     • EVAP purge pipe from the Q12 EVAP purge solenoid valve
     • EVAP purge pipe at the EVAP canister
     • EVAP vapor pipe at the EVAP canister
5. If a condition with the EVAP system cannot be located, refer to Diagnostic Aides.