P0455

DTC P0455

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC P0455
- Evaporative Emission (EVAP) System Large Leak

Circuit/System Description

The 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

* Before the ECM can report DTC P0455 failed, DTC P0496 must run and pass.
* DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0442, P0443, P0446, P0449, P0452, P0453, P1111, P1112, P1114, P1115, P1125, P1135, P1351, P1352, P1361, P1362, P1516, P1548, P2101, P2107, P2108, 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 75 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 9°C (16°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 a calibrated level of vacuum within a set amount of time.

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 adapter 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 at the service port adapter to allow the system to fill faster.
* To help locate intermittent leaks using the J 41413-200, move all EVAP components while observing smoke with the J 41413-SPT.
* Individual components can be isolated and tested using adapters in the J 41413-300.
* 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

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Evaporative Emission Control System Description (Evaporative Emission Control System Description)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

* CH 48096 - Evaporative Emissions Service Access Port Tool
* J 41415-30 - Fuel Tank Adapter
* J 41413-200 - Evaporative Emissions System Tester (EEST)
* J 41413-300 - Evaporative Emissions Cap and Plug Kit
* J 41413-311 - Evaporative Emissions Plug
* J 41413-SPT - High Intensity White Light
* J 41413-VLV - Evaporative Emissions Service Port Vent Tool
* For equivalent regional tools, refer to Special Tools (Tools and Equipment).

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 - EEST operation manual for detailed instructions in Evaporative Emission System Diagnosis (Evaporative Emission System Diagnosis).

1. Disconnect the purge tube at the quick connector on the evaporative emission canister side of the Q12 evaporative emission canister purge solenoid valve. Install the CH 48096 - Port Tool between the disconnected purge tube and the purge solenoid valve. Connect the J 41413-200 - EEST to the service access port tool.
2. Use a scan tool to seal the evaporative emission system.
3. Use the flow meter on the J 41413-200 - EEST, calibrated to 0.51 millimeter (0.020 inch) to determine that there is no leak in the evaporative emission system.

• If a leak is detected, use the J 41413-200 - EEST to apply smoke to the evaporative emission system at the purge tube until the leak is located using the J 41413-SPT - White Light.

4. To test for a restriction, connect the J 41413-200 - EEST nitrogen/smoke hose to the to the J 41413-311 - Evaporative
Emission Plug brass cone adapter. Disconnect the hose at the fuel cap end of the J 41415-30 - Adapter. Connect the J 41413-311 - Evaporative Emission Plug to the disconnected hose on the J 41415-30 - Adapter. Install the J 41415-30 - Adapter filler neck end only to the vehicle.
5. Allow the engine to idle.
6. Use the Purge/Seal function to seal the system with a scan tool.
7. Command the EVAP Purge Solenoid Valve to 30 percent.
8. The vacuum/pressure gauge on the J 41413-200 - EEST and the fuel tank pressure parameter on the scan tool should both show vacuum.

• If the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure sensor.
• If neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.

9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 V, and the values are similar between the scan tool and the vacuum/pressure gauge on the J 41413-200 - EEST.

• If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Fuel Tank Pressure Sensor Replacement (Fuel Tank Pressure Sensor Replacement)
* Control Module References (Programming and Relearning) for engine control module (ECM) replacement, setup, and programming