2010 Cadillac CTS Sedan AWD V6-3.6L Page 1419
P0700, P2227, P2228, or P2229 is not set.
* The engine is operating.
* The BARO is greater than 68 kPa.
* The fuel level is between 11-88 percent.
* The ECM has commanded the EVAP canister purge solenoid OFF.
* The ECM has commanded the EVAP canister vent valve open.
OR
* The fuel level is less than 60 percent, 73 percent for LLT.
* The vehicle speed is between 10-76 km/h (6-47 mph) for greater than 30 seconds.
* The ECM has commanded the EVAP canister purge solenoid ON.
OR
* The calculated ambient air temperature is between 4-35掳C (39-95掳F) for greater than 3 seconds.
* DTC P0451 runs continuously when the above conditions are met for approximately 7 seconds.
Conditions for Setting the DTC
P0450
The ECM detects that the FTP sensor signal oscillates greater than 6.09 mm/Hg (3.26 in. H2O) for 4 seconds, or for a cumulative of 30 seconds.
P0451
* The ECM detects that the FTP is less than -26.2 mm/Hg (-14.1 in. H2O) or greater than 11.0 mm/Hg (5.9 in. H2O) for 4 seconds or for a
cumulative of 30 seconds.
OR
* The ECM detects a change in the zero point of FTP sensor signal greater than +/-5.16 mm/Hg (2.76 in. H2O) from the zero point at start up
for 4 seconds, or a cumulative of 30 seconds.
Action Taken When the DTC Sets
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 (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
Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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)
