Test Description

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

1. Make sure you perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
2. 1
   
   This step is to run the HO2S Heater Tests. Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.
3. 2
   
   This step is to run the Catalyst Test. The Catalyst Test runs during the specified cruise period.
4. 3
   
   This step is to run the Catalyst Test. The Catalyst Test runs during the specified cruise period.
5. 4
   
   This step is to run the EGR Tests. The EGR 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. If the vehicle is not equipped with an EGR System, this step is not necessary and the testing can continue at step 5.
6. 5
   
   This step is to run the Oxygen Sensor Tests. These tests run during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
7. 6
   
   This step is to run the EVAP Tests. These tests run during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
8. 8
   
   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.