2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1359

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1359

DTCs P0450 and P0451 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0450 and P0451 are Type B DTCs.

Diagnostic Aids

A blocked or clogged EVAP canister vent may set these 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)

Connector End View Reference

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

Description and Operation

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

Operation/Evaporative Emission Control System Description)

Electrical Information Reference

* 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

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 Testing

1. Ignition OFF, 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

.

2. Ignition ON, seal the system using the Purge Seal function with a scan tool.

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 pressure/vacuum gauge. Verify the fuel tank pressure sensor parameter is within +/-0.9 mmHg (+/-0.5 in.H2O) of the

pressure/vacuum gauge.

瀚慖f not within the specified range, replace the B150 fuel tank pressure sensor.

4. Command the EVAP vent solenoid valve OPEN with a scan tool. Verify the scan tool Fuel Tank Pressure Sensor parameter is -0.9 to +0.9

mmHg (-0.5 to +0.5 in.H2O).

瀚慖f not within the specified range, replace the B150 fuel tank pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.