2010 Cadillac CTS Sedan AWD V6-3.6L Page 1428
The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and
vent valves.
Conditions for Running the DTC
* Before the engine control module (ECM) can report DTC P0455 or DTC P0497 failed, DTCs P0446 and P0496 must run and pass.
* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0443, P0446, P0449, P0450, P0451, P0452,
P0453, P0458, P0459, P0496, P0498, P0499, P0560, P0562, P0563, P0700, P2122, P2123, P2127, P2128, P2138, P2227, P2228, or P2229 is
not set.
* The ignition voltage is between 10-18 V.
* The engine run time is greater than 10 min or the fuel trim is stable.
* The fuel tank pressure (FTP) is between -18.7 and +9.8 mm Hg (-10.0 and +5.2 in. H2O).
* The Closed Loop fuel control is enabled.
* The engine is idling.
* The barometric pressure (BARO) is greater than 68 kPa.
* The fuel level is between 11-88 %.
* The ambient air temperature (IAT) is between 2-32掳C (36-90掳F).
* The engine coolant temperature (ECT) is within 10掳C (18掳F) of the ambient air temperature at engine start.
* The vehicle speed sensor (VSS) is less than 3 km/h (2 mph).
* The above conditions are met for greater than 30 s
* DTC P0455 or DTC P0497 will attempt to run up to 10 times or until the test completes successfully once per ignition cycle.
Conditions for Setting the DTC
* The ECM detects the EVAP system is not able to achieve or maintain vacuum during the diagnostic test.
* The condition exists for greater than 4 s or for a cumulative of 30 s.
Action Taken When the DTC Sets
DTCs P0455 and P0497 are Type A/B DTCs.
Conditions for Clearing the DTC
DTCs P0455 and P0497 are Type A/B DTCs.
Diagnostic Aids
* A loose, missing, or damaged fuel fill cap can cause this DTC to set.
* A stuck closed, blocked, or restricted EVAP canister purge solenoid valve, can cause this DTC to set.
* A blockage or restriction in the EVAP canister purge solenoid valve vacuum supply hose, EVAP canister purge solenoid valve purge pipe,
EVAP canister, or vapor pipe, can cause this DTC to set.
* A temporary blockage in the EVAP canister purge solenoid valve, purge pipe or EVAP canister could cause an intermittent condition. Inspect
and repair any restriction in the EVAP system.
* To help locate intermittent leaks, use the J 41413-200 Evaporative Emissions System Tester (EEST) to introduce smoke into the EVAP
system. Move all EVAP components while observing smoke with the J 41413-SPT High Intensity White Light. Introducing smoke in 15 s
intervals will allow less pressure into the EVAP system. When the system is less pressurized, the smoke will sometimes escape in a more
condensed manner.
* To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT
.
* Observe the Freeze Frame/Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition
occurs that caused the DTC to set. This may assist in diagnosing the condition.
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
Evaporative Emission Control System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Evaporative Emission Control System Description)
