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Diagnostic Procedures

  1. Did you perform the Inspection/Maintenance (I/M) System Check? If yes, go to next step. If no, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
    WARNING: Road test vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
  2. Ensure vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING . Turn OFF all accessories, e.g., A/C, blower fan, etc. Start and idle engine. In order for this test to run, vehicle must operate in the following conditions: Accelerate vehicle to 30-50 MPH (48-80 km/h) and cruise for 3 minutes after engine reaches operating temperature. Decelerate to zero MPH. Idle engine for 2 minutes while the following criteria is maintained: Service brake is depressed, transmission in Drive (A/T) or Neutral (M/T), then accelerate at part throttle to 30-50 MPH (48-80 km/h) and maintain speed for 30 seconds. Using scan tool, review the I/M System Status display. Did HO2S/O2S System Status update to YES? If yes, go to step  5. If no, go to next step.
  3. Using scan tool, observe DTC Information. If scan tool indicates any failed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
    NOTE: Refer to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE  to determine which DTCs are required to run in order to complete this test.
  4. Using scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Operate vehicle within Conditions For Running DTC. Monitor status of DTCs that are necessary to complete the test in the NOT RAN SINCE CODE CLEARED display of scan tool. Repeat procedure until scan tool indicates the diagnostic test has run. Repeat this step for any additional required DTCs that have not run. Using scan tool, observe I/M System Status display. Did the HO2S/O2S System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Using scan tool, observe the emission related DTC portion of the I/M System Status display. Does the scan tool indicate any Emission Related DTCs set? If yes, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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