DTC P0455. Saturn ION 2007

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2007 🢒 ION 🢒 DTC 🢒 DTC P0455

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC P0455: Evaporative Emission (EVAP) System Large Leak

The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system. 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 solenoid valves.

Control Module Command	EVAP Canister Purge Solenoid Valve	EVAP Canister Vent Solenoid Valve
ON	Open	Closed/Not Venting
OFF	Closed	Open/Venting

Conditions for Running the DTC

•	DTCs P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0222, P0223, P0452, P0453, P0502, P0601, P0602, P0606, P0641 are not set.

•	The engine is running.

•	The ignition voltage is between 11-18 volts.

•	The barometric pressure (BARO) is more than 74 kPa.

•	The fuel level is between 15-85 percent.

•	The start-up engine coolant temperature (ECT) is between 4-30°C (39-86°F).

•	The start-up intake air temperature (IAT) is between 4-30°C (39-86°F).

•	The start-up ECT and IAT are within 8°C (14.4°F) of each other.

•	DTC P0455 runs once per cold start within 10 minutes of start-up.

Conditions for Setting the DTC

The EVAP system is not able to achieve or maintain vacuum for up to 4 times during the diagnostic test.

Action Taken When the DTC Sets

DTC P0455 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0455 is a Type B DTC.

Diagnostic Aids

•	A loose, missing, incorrect, or damaged fuel fill cap may cause this DTC to set.

•

To help locate intermittent leaks, use the J 41413-200 (J 41413-100) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with a high intensity white light . Introducing smoke in 15-second 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 a high intensity white light .

•	Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

•	A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for the vacuum decay, this type of leak may be detected.

•	If a small leak is difficult to find, it may be necessary to remove the EVAP components and leak test them one at a time.

Reference Information

Schematic Reference

•	Evaporative Emissions Hose Routing Diagram

•	Engine Controls Schematics

Connector End View Reference

•	Engine Control Module Connector End Views

•	Engine Controls Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

•	Scan Tool Data List

•	Scan Tool Data Definitions

•	Scan Tool Output Controls

Special Tools Required

•	GE-41415-50 Fuel Tank Cap Adapter

•	J 41413-200 (J 41413-100) Evaporative Emission System Tester (EEST)

Circuit/System Testing

Important:

•	Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.

•	Refer to the J 41413-200 (J 41413-100) operation manual for detailed instructions.

Using the GE-41415-50 , connect the J 41413-200 (J 41413-100) to the vehicle filler neck.
Seal the system and use the flow meter on the J 41413-200 (J 41413-100) , calibrated to 0.51 mm (0.02 in) to determine that there is no leak in the EVAP system.

⇒	If a leak is detected, use the J 41413-200 (J 41413-100) to apply smoke to the EVAP system at the service port or the filler neck until the leak is located.

Start the engine with the J 41413-200 (J 41413-100) connected to the fuel filler neck.
Allow the engine to idle.
Use the Purge/Seal function to seal the system with a scan tool.
Command the EVAP canister purge solenoid valve to 20 percent.
The vacuum/pressure gage on the J 41413-200 (J 41413-100) and the FTP parameter on the scan tool should both show vacuum.

⇒	If the vacuum/pressure gage shows vacuum but the FTP parameter does not show vacuum, replace the FTP sensor.

⇒	If neither the FTP parameter nor the vacuum/pressure gage shows vacuum, repair the restriction in the purge path.

Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the value is closely similar between the scan tool and the vacuum/pressure gage on the J 41413-200 (J 41413-100) .

⇒	If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Fuel Tank Pressure Sensor Replacement

•	Control Module References for engine control module (ECM) replacement, setup, and programming

•	Evaporative Emission System Cleaning

•	Evaporative Emission Canister Filter Replacement