PRE-RELEASE
DTC P0455 (LF1, LFW)
| DTC P0455 (LF1, LFW) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 |
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Before the ECM can report DTC P0455 failed, DTC P0496 must run and pass.
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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.
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The ignition voltage is between 11-18 V.
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The barometric pressure (BARO) is more than 74 kPa.
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The fuel level is between 10-90 percent.
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The engine coolant temperature (ECT) at start-up is less than 35°C (95°F).
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The intake air temperature (IAT) is between 4-30°C (39-86°F).
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DTC P0455 runs once per cold start when the above conditions are met.
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| 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 |
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Inspect for a loose, missing, damaged, or incorrect fuel fill cap.
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Inspect for a damaged fuel filler neck seal surface.
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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.
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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.
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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.
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Individual components can be isolated and tested using adapters in the
J 41413-300
Kit.
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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.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
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CH 48096
Evaporative Emissions Service Access Port Tool
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J 41415-30
Fuel Tank Adapter
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J 41413-200
Evaporative Emissions System Tester (EEST)
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J 41413-300
Evaporative Emissions Cap and Plug Kit
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J 41413-311
Evaporative Emissions Plug
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J 41413-SPT
High Intensity White Light
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J 41413-VLV
Evaporative Emissions Service Port Vent Tool
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For equivalent regional tools, refer to
Special Tools
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| Circuit/System Testing |
| Note | ||
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Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
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Refer to the
J 41413-200
EEST operation manual for detailed instructions in
Evaporative Emission System Diagnosis
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| 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.
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| 2. |
Use a scan tool to seal the evaporative emission system.
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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.
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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.
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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.
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Allow the engine to idle.
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Use the Purge/Seal function to seal the system with a scan tool.
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Command the evaporative emission canister purge solenoid valve to 30 percent.
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The vacuum/pressure gauge on the
J 41413-200
EEST and the fuel tank pressure parameter on the scan tool should both show vacuum.
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If the vacuum/pressure gauge shows vacuum, but the fuel tank pressure parameter does not show vacuum, replace the fuel tank pressure sensor.
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If neither the fuel tank pressure parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
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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.
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If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 fuel tank pressure sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Fuel Tank Pressure Sensor Replacement
