2010 Cadillac CTS Sedan AWD V6-3.6L Page 1460
瀚慖f the floating indicator is below the red flag, test for a blockage or restriction in the EVAP system.
6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
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 GE-41415-50 to the fuel tank filler neck. Connect the J 41413-200 to the GE-41415-50 .
2. Connect the CH-48096 between the EVAP purge solenoid and the EVAP purge pipe.
3. Turn the nitrogen/smoke valve on the control panel to SMOKE.
4. Command the EVAP vent solenoid closed with a scan tool.
5. Use the remote switch to introduce smoke into the EVAP system.
6. Use the J 41413-VLV to open the EVAP service port. Once smoke is observed, remove the J 41413-VLV .
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 .
Note: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
瀚慖f smoke is observed, repair the condition as necessary.
8. Remove the J 41413-200 nitrogen supply hose from the GE-41415-50 , and remove the GE-41415-50 from the fuller neck.
9. Install the fuel fill cap.
10. Connect the J 41413-200 nitrogen/smoke supply hose to the EVAP service port of the CH-48096 .
11. Command the EVAP vent solenoid 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 .
瀚慖f smoke is observed, repair the condition as necessary.
14. Verify the individual EVAP system components for a leak using the J 41413-300 .
瀚慖f a condition is found replace the affected component.
Blockage/Restriction Testing
1. Connect the GE-41415-50 to the fuel tank filler neck. Connect the J 41413-200 to the GE-41415-50 .
2. Seal the EVAP system with the scan tool EVAP Purge/Seal function.
3. Pressurize the EVAP system with nitrogen to 9.33 mm/Hg 5 in H20. Compare the scan tool Fuel Tank Pressure Sensor parameter to the J
41413-200 pressure/vacuum gauge. The FTP sensor parameter should be within 1.86 mm/Hg (1 in H2O) of the pressure/vacuum gauge.
瀚慖f not within the specified range, replace the FTP sensor.
4. Increase the EVAP purge solenoid to 100 %. The FTP sensor pressure should drop to less than 1.86 mm/Hg (1 in H2O).
瀚慖f 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 less than the specified value when a pipe is disconnected, test for a blockage or
restriction in one of the following EVAP pipe/hoses:
1. EVAP purge vacuum source from the EVAP purge solenoid
2. EVAP purge pipe from the EVAP purge solenoid
3. EVAP purge pipe at the EVAP canister
4. EVAP vapor pipe at the EVAP canister
5. If you cannot locate a condition with the EVAP system, refer to Diagnostic Aids for additional information.
Component Testing
1. Seal the EVAP system with the scan tool EVAP Purge/Seal function.
2. Pressurize the EVAP system to 9.33 mm/Hg (5 in H20).
