Test Description

The numbers below refer to the step numbers on the diagnostic procedure.

1. 1
   
   Perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
2. 2
   
   The EGR Active Tests are run during a gradual deceleration with a closed throttle. The vehicle speed is required in order to maintain a high, steady MAP signal.
3. 3
   
   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 it becomes a 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 .
4. 4
   
   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 TEST .
5. 5
   
   The I/M system Status only reports on whether or not a diagnostic has run, not the outcome of the test. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.