2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1352
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* 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
1. Ignition ON, command the EVAP purge solenoid to 50 percent with a scan tool. You should hear an audible click.
2. Engine operating, observe the scan tool EVAP Purge Solenoid Circuit Test Status parameters. Verify the parameters display OK or Not Run.
3. 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
1. Ignition OFF, disconnect the harness connector at the Q12 EVAP purge solenoid.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
瀚慖f the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests
normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
3. Connect a test lamp between the control circuit terminal 2 and the ignition voltage circuit terminal 1.
Note: The control circuit for the EVAP purge solenoid is pulled-up to voltage within the ECM, 2.6-4.6 V on the control circuit is normal.
4. Command the EVAP purge solenoid to 50 percent and then to 0 percent with a scan tool. The test lamp should illuminate or flash and then go
OFF.
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. Test for 2.6-4.6 V between the control circuit terminal 2 and the ECM housing.
瀚慖f the voltage is not within the specified range, replace the K20 ECM.
6. If all circuits test normal, test or replace the Q12 EVAP purge solenoid.
Component Testing
1. Ignition OFF, disconnect the harness connector at the EVAP purge solenoid. Test for 15-20 ohm between the terminals of the EVAP purge
solenoid.
瀚慖f not within the specified range, replace the Q12 EVAP purge solenoid.
2. Measure the resistance between each terminal of the EVAP purge solenoid and the EVAP purge solenoid housing. The DMM should display
O.L.
瀚慖f less than the specified value, replace the Q12 EVAP purge solenoid.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Evaporative Emission Canister Purge Solenoid Valve Replacement (LF1) (See: Powertrain Management/Emission Control
Systems/Evaporative Emissions System/Canister Purge Solenoid/Service and Repair)Evaporative Emission Canister Purge Solenoid Valve
Replacement (LAU) (See: Powertrain Management/Emission Control Systems/Evaporative Emissions System/Canister Purge
Solenoid/Service and Repair)
