Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 1
   
   Perform the I/M System Check before performing this test. See INSPECTION/MAINTENANCE SYSTEM CHECK . Failure to do so may result in difficulty updating the status to YES.
2. 3
   
   This step is to determine whether or not the EVAP System Test has passed. If the system is operating correctly, the scan tool indicates that the system has passed and the I/M SYSTEM STATUS updates to YES. If the EVAP Service Bay Test aborts because of lost enable conditions, the test can be repeated once the enable criteria is met.
3. 4
   
   A failed DTC during the EVAP service bay test may not appear in the DTC Information display on some vehicles. The service bay test displays an indication of which test failed as a directive to the appropriate service information. Some vehicles will display the test as aborted and the first failure of type "B" DTC appears in the DTC Information.
4. 5
   
   The EVAP System Test usually begins when the engine coolant temperature is between 39-86°F (4-30°C). The vehicle should be operated moderately until this temperature is reached. The engine coolant temperature can be monitored using the scan tool.
5. 6
   
   This step is to identify a first failure of a type "B" DTC. A DTC only appears on the I/M System Status display when the DTC becomes a Malfunction Indicator Lamp (MIL) illuminating DTC. This occurs on the second failure of a type "B" DTC. A first failure of a type "B" DTC will not allow the I/M System Status to update to YES. See DIAGNOSTIC AIDS .
6. 7
   
   This step is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. See Conditions for Running DTC.
7. 8
   
   The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.