Test Description
WARNING: This page is about a different car, the 2003 Chevrolet Tracker. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 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.
- 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.
- 2 - This step is to run the Catalyst Test. The Catalyst Test runs during the specified cruise period.
- 3 - This step is to run the Catalyst Test. The Catalyst Test runs during the specified cruise period.
- 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.
- 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.
- 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 - 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.