Description
The evaporative emission (EVAP) Service Bay Test is designed to hasten the
resetting of the EVAP inspection/maintenance (I/M) system status to Complete. The
Service Bay Test uses the scan tool to initiate the control modules regular sequence
of the EVAP system DTC tests. The Service Bay Test only activates the regular DTC
test, but with relaxed temperature thresholds. The scan tool will display any specific
reasons the test aborts or if the tests have passed or failed. The test will not begin
if any enabling criteria are not met. On vehicles equipped with engine off natural
vacuum (EONV), the time that is required for resetting the I/M system status to Complete
is minimized by eliminating multiple cold soaks. The Service Bay Test can be used
to verify that the EVAP system is OK after a repair has been completed.
Conditions for Running the Test
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 15-85 percent of capacity. |
| • | The vehicle speed is less than 4.8 km/h (3 mph). |
| • | Stored DTCs have been cleared. |
Diagnostic Aids
Vehicles equipped with the EONV diagnostic should refer to
Evaporative Emission Control System Description
.
Use the Evaporative Emissions System Tester J 41413-200
with the Operation Manual J 41413-210 to locate any EVAP leaks.
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.
- Check DTCs with a scan tool.
- Continue with the published service manual diagnostic DTC procedure.
