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DTC P0455 (LF1, LFW)

DTC P0455 (LF1, LFW)

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 provides an overview of each diagnostic category.


DTC Descriptor

DTC P0455

Evaporative Emission System Large Leak Detected

Circuit/System Description

The ECM tests the evaporative emission (EVAP) system for a large leak or restrictions to the purge path in the evaporative emission system. When the enabling criteria have been met the ECM commands the EVAP canister vent solenoid valve ON and the EVAP canister purge solenoid valve ON, allowing vacuum into the evaporative emission system. The ECM monitors the fuel tank pressure 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 P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0442, P0443, P0449, P0451, P0452, P0453, P0454, P0464, P0496, P0608, P0609, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138 are not set.

• The ignition voltage is between 11-18 V.

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

• The fuel level is between 10-90 percent.

• The engine coolant temperature (ECT) at start-up is less than 35°C (95°F).

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

• DTC P0455 runs once per cold start when the above conditions are met.


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 evaporative emission purge solenoid valve, purge pipe, evaporative emission canister, or vapor pipe, can cause this DTC to set.

• The evaporative emission 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.

• To help locate intermittent leaks using the J 41413-200 EEST, move all evaporative emission 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 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 EVAP Purge/Seal function to create a vacuum in the EVAP system and then observe the fuel tank pressure parameter for vacuum decay.


Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Description and Operation

Evaporative Emission Control System Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References 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 .


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 .



1. Connect the J 41413-200 EEST to the vehicle evaporative emission purge tube. Disconnect the purge tube at the quick connector on the evaporative emission canister side of the Q12 evaporative emission canister purge solenoid valve and install the CH 48096 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.

4. 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.

5. 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. Detach the hose at the end of the filler cap on the J 41415-30 adapter. Connect the J 41413-311 evaporative emission plug to the disconnected hose on the J 41415-30 adapter. Only fit the J 41415-30 end of the adapter's filler neck to the vehicle.

6. Allow the engine to idle.

7. Use the Purge/Seal function to seal the system with a scan tool.

8. Command the evaporative emission canister purge solenoid valve to 30 percent.

9. The vacuum/pressure gauge on the J 41413-200 EEST and the fuel tank pressure parameter on the scan tool should both show vacuum.

10. If the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure sensor.

11. If neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.

12. 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.

13. 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 after completing the diagnostic procedure.

Fuel Tank Pressure Sensor Replacement