P0455
DTC P0455
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
DTC Descriptor
DTC P0455
- Evaporative Emission (EVAP) System Large Leak
Circuit/System Description
The engine control module (ECM) tests the evaporative emission (EVAP) system for a large leak or restrictions to the purge path in the EVAP system. When the enabling criteria has been met, the ECM commands the EVAP canister vent solenoid valve ON, and the EVAP canister purge solenoid valve ON, allowing vacuum into the EVAP system. The ECM monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time.
Conditions for Running the DTC
* DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0442, P0443, P0446, P0449, P0452, P0453, P1111, P1112, P1114, P1115, P1516, P2101, P2119, P2120, P2125, P2135, P2138 are not set.
* The engine is running.
* The ignition voltage is between 10-18 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 less than 30°C (86°F).
* The start-up intake air temperature (IAT) is less than 30°C (86°F).
* The start-up ECT and IAT are within 8°C (14°F) of each other.
* DTC P0455 runs once per cold start within 16 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
* Inspect for a loose, missing, damaged, or incorrect fuel fill cap.
* Inspect for a damaged fuel filler neck seal surface.
* A blockage or restriction in the EVAP purge solenoid valve, purge pipe, EVAP canister, or vapor pipe can cause this DTC to set.
* The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. For example, when injecting smoke at the service port, remove the fuel fill cap, or temporarily leave the vent open until smoke is observed, then close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV - Vent Fitting at the service port to allow the system to fill faster.
* To help locate the intermittent leaks using the J 41413-200 - EEST , move all EVAP components while observing smoke with the J 41413-SPT - White Light.
* Individual components can be isolated and tested using adapters in the J 41413-300 - Plug Kit.
* A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the; EVAP system, and then observe the FTP parameter for vacuum decay.
Reference Information
Schematic Reference
* Evaporative Emissions Hose Routing Diagram ([1][2]Diagrams)
* Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Special Tools
* CH 48096 - EVAP Service Access Port Tool
* GE 41415-50 - Fuel Tank Cap Adapter
* J 41413-200 - Evaporative Emission System Tester (EEST)
* J 41413-300 - EVAP Cap and Plug Kit
* J 41413-311 - EVAP Plug
* J 41413-SPT - High Intensity White Light
* J 41413-VLV - EVAP Service Port Vent Fitting
Circuit/System Testing
Note:
* 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 operation manual for detailed instructions.
1. Connect the J 41413-200 - EEST to the vehicle EVAP service port. For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH 48096 - Port Tool.
2. Seal the EVAP system and use the flow meter on the J 41413-200 - EEST 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 - EEST to apply smoke to the EVAP system at the service port until the leak is located.
3. To test for a restriction, connect the J 41413-200 - EEST nitrogen/smoke hose to the J 41413-311 - Plug brass cone adapter. Disconnect the hose at the fuel cap end of the GE 41415-50 - Cap Adapter. Connect the J 41413-311 - Plug to the disconnected hose on the GE 41415-50 - Cap Adapter. Install the GE 41415-50 - Cap Adapter filler neck end only to the vehicle.
4. Allow the engine to idle.
5. Use the Purge/Seal function to seal the system with a scan tool.
6. Command the EVAP canister purge solenoid valve to 30 percent.
7. The vacuum/pressure gage on the J 41413-200 - EEST 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. Refer to Evaporative Emissions Hose Routing Diagram ([1][2]Diagrams).
8. 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 - EEST.
• 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 (Verification Tests) after completing the diagnostic procedure.
* Fuel Tank Pressure Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for engine control module (ECM) replacement, setup, and programming
* Evaporative Emission System Cleaning (Service and Repair)