Description
The EVAP Service Bay Test raises the engine coolant temperature (ECT) threshold
so that the temperature sensitive EVAP diagnosis tests can run while in service environments.
When the EVAP tests are run the Service Bay Test will indicate a passed or will indicate
a specific DTC code has failed. The EVAP Service Bay Test can be used to verify an
existing condition and verify that the EVAP system is OK after a repair is completed.
Conditions for Running the Test
Important: When the service bay test is performed, a DTC P0440 may be displayed, if a large
leak condition is detected. A DTC P1441 may be displayed if undesired intake manifold
vacuum condition is detected. Diagnose the DTC P0440 using the DTC P0455 diagnostic
table. Diagnose the DTC P1441 using the P0496 diagnostic table.
Important: The following conditions must be met in order to enable the Service Bay Test.
| • | The battery voltage is between 9-18 volts. |
| • | The engine coolant temperature (ECT) is less than 70°C (158°F). |
| • | The fuel level is between 15-85 percent of capacity. |
| • | The vehicle speed is less than 4.8 km/h (3 mph). |
| • | Stored DTCs have been cleared. |
Test Procedure
- Install a scan tool.
- With a scan tool, select the Service Bay Test in the special functions
menu.
- Follow the instructions on the scan tool.
- Continue with the published service manual diagnostic DTC procedure.
