2010 Cadillac CTS Sedan AWD V6-3.6L Page 1459
Diagnostic Aids
* A loose, missing, or damaged fuel fill cap can cause this DTC to set.
* A stuck closed, blocked, or restricted EVAP canister purge solenoid valve, can cause this DTC to set.
* A blockage or restriction in the EVAP canister purge solenoid valve vacuum supply hose, EVAP canister purge solenoid valve purge pipe,
EVAP canister, or vapor pipe, can cause this DTC to set.
* A temporary blockage in the EVAP canister purge solenoid valve, purge pipe or EVAP canister could cause an intermittent condition. Inspect
and repair any restriction in the EVAP system.
* To help locate intermittent leaks, use the J 41413-200 Evaporative Emissions System Tester (EEST) to introduce smoke into the EVAP
system. Move all EVAP components while observing smoke with the J 41413-SPT High Intensity White Light. Introducing smoke in 15 s
intervals will allow less pressure into the EVAP system. When the system is less pressurized, the smoke will sometimes escape in a more
condensed manner.
* To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT
.
* Observe the Freeze Frame/Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition
occurs that caused the DTC to set. This may assist in diagnosing the condition.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Evaporative Emission Control System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Evaporative Emission Control System Description)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* J 41413-SPT High Intensity White Light
* J 41413-VLV EVAP Port Vent Fitting Tool
* J 41413-200 Evaporative Emissions System Tester (EEST)
* J 41413-300 EVAP Cap and Plug Kit
* CH-48096 EVAP Service Port Access Tool
* GE-41415-50 Fuel Tank Cap Adapter
Circuit/System Verification
1. Verify the following conditions do not exist in the EVAP system:
* Loose, incorrect, missing, or damaged fuel fill cap
* Loose, missing, or damaged service port schrader valve, if equipped
* A damaged EVAP canister purge solenoid valve
* Disconnected, incorrectly routed, kinked, or damaged EVAP pipes and hoses
* A damaged EVAP vent valve or EVAP canister
瀚慖f you find any of the above conditions, repair as necessary.
Note: Refer to the J 41413-200 operation manual for detailed instructions.
2. Remove the fuel fill cap. Connect the GE-41415-50 to the fuel tank filler neck. Connect the J 41413-200 to the GE-41415-50 .
3. Calibrate the J 41413-200 Flow Meter to the correct leak orifice for the vehicle.
4. Command the EVAP vent solenoid closed with a scan tool.
Note: Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
5. Activate the J 41413-200 and compare the flow meter's stable floating indicator position to the red flag. The floating indicator should be
below the red flag.
瀚慖f the floating indicator is above the red flag, test for a leak in the EVAP system.
