2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1361

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1361

* The ambient air temperature is greater than -7掳C (+19掳F).

* The vehicle speed is less than 10 km/h (6 mph) for greater than 29 seconds.

* The BARO is greater than 68 kPa.

* The fuel level is between 11-88 percent.

* The ECM has commanded the EVAP canister purge solenoid ON.

* The ECM has commanded the EVAP canister vent valve closed for greater than 4 seconds.

* DTC P0451 runs continuously when the above conditions are met for approximately 25 seconds.

P0451 Condition 2

* DTC P0100, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0443, P0449, P0458, P0459, P0498, P0499, P050A, P0506, P0507,

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 fuel tank pressure 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 fuel tank pressure 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 (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