Diagnostic Procedures
- Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
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- Accelerate vehicle at part throttle to 55 MPH and maintain speed for 5 minutes.
- Stop vehicle (zero MPH).
- Operate engine at idle for 2 minutes with service brake depressed, transmission in Drive (A/T) or in Neutral with clutch pedal depressed (M/T).
- Using scan tool, observe DTC Information. If DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, go to next step.
- Using scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Enter DTC in Specific DTC menu on scan tool. Operate vehicle within the ENABLE CRITERIA . 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. If status updates to YES, go next step. If status does not update to YES, see DIAGNOSTIC AIDS .
- Using scan tool, observe emission related DTC portion of I/M System Status display. If scan tool indicates any emission related DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
CAUTION:
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.
NOTE:
Refer to INSPECTION/MAINTENANCE SYSTEM DTC TABLE to determine which DTCs are required to run in order to complete this test.