2010 Cadillac Truck SRX FWD V6-3.0L Page 1495

2010 Cadillac Truck SRX FWD V6-3.0L Page 1495

DTCs P0443 and P0449 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Description and Operation

Evaporative Emission Control System Description (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Evaporative Emission Control System Description)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Troubleshooting with a Test Lamp (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Circuit Testing/Troubleshooting with a Test Lamp)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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

Circuit/System Verification

P0443

1. Ignition ON, engine OFF, you should hear a clicking sound when the EVAP canister purge solenoid valve is commanded to 50 percent with a

scan tool. The clicking sound should stop when the EVAP canister purge solenoid valve is commanded to 0 percent. The rate at which the

valve cycles should increase when the commanded state is increased, and decrease when the commanded state is decreased.

2. 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.

P0449

1. Ignition ON, engine OFF, command the EVAP vent solenoid ON and OFF with a scan tool.

2. Listen for a click when the valve operates. Verify that both the ON, and the OFF states are commanded.

3. 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.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Q 12 EVAP canister purge or the Q 13 EVAP vent solenoid valve.

2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal B for vent or 1 for purge valve and ground.

瀚慖f the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests

normal and the voltage supply circuit fuse is open, test or replace the evaporative emission canister purge or vent solenoid valve.

3. Connect a test lamp between the voltage supply circuit terminal B for vent or 1 for purge valve and the control circuit terminal A for vent or 2

for purge valve.

4. Command the evaporative emission canister purge solenoid valve to 50 percent with a scan tool, or the evaporative emission canister vent

solenoid valve ON and OFF. The test lamp should respond to the command.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the K20 ECM.

5. If all circuits test normal, replace the appropriate solenoid valve.