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| • | 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. |
This DTC tests the evaporative emission (EVAP) system for a small and large leak when the Vehicle is turned OFF and the correct conditions are met. The propulsion system needs to be OFF for several hours before the small and large leak 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
The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP components:
Engine Control Module Command | EVAP Canister Purge Solenoid Valve | EVAP Canister Vent Solenoid Valve | Vacuum Pump | Switch Valve |
|---|---|---|---|---|
ON | Open | Open/Venting | Pump Runs | Pump Position/Not Venting |
OFF | Closed | Closed/Not Venting | Pump OFF | Vent Position |
| • | DTCs P043E, P043F, P06E4, P0111, P0112, P0113, P0114, P0117, P0118, P0116, P0119, P0128, P0449, P0498, P0499, P1458, P145A, P145C, P145D, P145E, P145F, P0451, P0452, P0453, P0461, P0462, P0463, P0502, P0503, P0722, P0723, P1459, P2066, P2067, P2068, P2400, P2401, P2402, P2418, P2419, P2420, P2421, P2422, P2450, P2537, P2610, U0140, U182D, U0073, U0074, is not set |
| • | The barometric pressure (BARO) is between 70-110 kPa (10-16 PSI). |
| • | The fuel level is between 10-90 %. |
| • | The ECT is less than 40°C (104°F). |
| • | The IAT is between 4-45°C (39-113°F). |
| • | The system voltage is greater than 10 V. |
| • | Vehicle speed less than 1.6 km/h (1 MPH). |
| • | A refuelling event needs to be detected prior to running this test --P0455 only. |
| • | 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. |
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 for greater than 6 min.
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 for greater than 6 min.
DTCs P0442 and P0455 are Type B DTCs.
DTCs P0442 and P0455 are Type B DTCs.
| • | 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 GE-41413-300 . |
Evaporative Emission Control System Description
Hybrid Modes of Operation Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| • | CH-48096 EVAP Service Access Port Tool |
| • | GE-41413-300 EVAP Cap And Plug Kit |
| • | J 41413-200 Evaporative Emissions System Tester |
| • | GE-41413-SPT High Intensity White Light |
| • | J 41415-30 Fuel Tank Cap Adapter |
For equivalent regional tools, refer to Special Tools : Diagnostic Tools .
| • | Loose, incorrect, missing, or damaged fuel fill cap |
| • | A damaged EVAP purge solenoid |
| • | Disconnected, incorrectly routed, kinked, or damaged EVAP pipes and hoses |
| • | A damaged EVAP vent valve or EVAP canister |
| ⇒ | If you find any of the above conditions, repair as necessary. |
Note: Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission Control System Diagnosis
Note:
• Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilise. • Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilise before starting the diagnostic procedure. The system flow will be less with higher temperatures.
1. Vehicle OFF, turn the nitrogen/smoke valve on the control panel to SMOKE.
2. Vehicle in Service Mode, command the EVAP vent solenoid ON with a scan tool.
Note:
• The fuel sender may need to be accessed to inspect some of the EVAP system components. • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilise. • Introduce smoke at 15 second intervals while testing the system.
3. Use the remote switch to introduce smoke into the EVAP system.
4. Verify that smoke is not exiting the entire EVAP system with the GE-41413-SPT
| ⇒ | If smoke is observed, repair the condition as necessary. |
| ⇒ | If floating indicator is above the red flag, a leak still exists. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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