P0442
DTC P0442 or 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 Descriptors
DTC P0442
- Evaporative Emission (EVAP) System Small Leak Detected
DTC P0455
- Evaporative Emission (EVAP) System Large Leak Detected
Circuit/System Description
This DTC tests the evaporative emission (EVAP) system for a leak.
A small leak, equal to or greater than 0.51 mm (0.020 in) is detected in the EVAP system between the fuel cap, purge solenoid, and the vent solenoid valve.
A large leak, greater than 0.51 mm (0.020 in) is detected in the EVAP system between the fuel cap, purge solenoid, and the vent solenoid valve, after a refueling event has been detected.
These tests only run when the propulsion system is OFF. The propulsion system needs to be OFF for several hours before these tests run. The EVAP leak detection pump creates a vacuum across a 0.51 mm (0.020 in) reference orifice. This reference vacuum is then compared to the vacuum level created in the fuel tank to determine if a leak exists.
Conditions for Running the DTC
P0442
Note: There are three possible time windows for this test to run. Up to that point and through this time period the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 hours.
* The odometer is equal to or greater than 15.9 kilometers (9.9 miles).
* The barometric pressure (BARO) 70 kPa (10 PSI) - 110 kPa (16 PSI).
* The fuel level 10 - 90 percent.
* The ECT less than 40°C (104°F).
* The IAT 4°C (39°F) - 45°C (113°F).
* System voltage greater than 10 volts.
* Vehicle speed less than 1.6 km/h (1 MPH).
P0455
Same as for P0442, but a refueling event needs to be detected prior to running this test.
Conditions for Setting the DTC
P0442
DTC P0442 sets when the EVAP leak detection pump pressure sensor (gauge) vacuum reading is less than the 0.51 mm (0.020 in) reference orifice vacuum measurement plus a calibrated value.
P0455
DTC P0455 sets after a refueling event has been detected and the small/large leak diagnostics have not passed. If the EVAP leak detection pump pressure sensor (gauge) vacuum reading is less than the 0.51 mm (0.020 in) reference orifice vacuum measurement and times a calibrated value.
Action Taken When the DTC Sets
DTCs P0442 and P0455 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0442 and P0455 are Type B DTCs.
Diagnostic Aids
* The EVAP system can be filled with smoke more quickly and completely by injecting smoke at the purge tube and commanding the vent solenoid valve open. For example, when injecting smoke at the purge tube, remove the filler cap or temporarily leave the vent solenoid valve open until smoke is observed. Close the system and continue testing. If using a fuel cap adapter at the filler neck, disconnect the purge tube at the EVAP canister purge solenoid valve until smoke is observed.
* To help locate intermittent leaks, use the EN 41413-200 - Evaporative Emissions System Tester to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with a high intensity white light.
* 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.
* If a small leak is difficult to find, it may be necessary to remove the EVAP components and test them one at a time using the adapters in the EN 41413-300 - EVAP Cap And Plug Kit.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Description and Operation
Evaporative Emission Control System Description Evaporative Emission Control System Description
Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* 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 Control Module References for scan tool information
Special Tools
* CH 48096 - EVAP Service Access Port Tool
* EN 41413-300 - EVAP Cap And Plug Kit
* EN 41413-200 - Evaporative Emissions System Tester
* EN 41413-SPT - High Intensity White Light
* GE 41415-30 - Fuel Tank Cap Adapter
For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).
Circuit/System Testing
Note:
* Refer to the EN 41413-C - Evaporative Emissions System Tester operation manual for detailed instructions in Evaporative Emission Control System Description Evaporative Emission Control System Description.
* Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
* Refer to the EN 41413-200 - Evaporative Emissions System Tester operation manual for detailed instructions, see Alcohol/Contaminants in Fuel 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 and install the CH 48096 - Port Tool.
2. Connect the EN 41413-200 - Evaporative Emissions System Tester to the CH 48096 - Port Tool.
3. Use the flow meter on the EN 41413-200 - Evaporative Emissions System Tester , calibrated to 0.51 mm (0.020 in) to determine if there is a leak in the evaporative emission system.
• If a leak is detected, use the EN 41413-200 - Evaporative Emissions System Tester to apply smoke to the evaporative emission system at the purge tube until the leak is located using the EN 41413-SPT - White Light.
Repair Verification
1. Seal the EVAP system and use the flow meter on the EN 41413-200 - Evaporative Emissions System Tester , calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
2. Clear DTCs.