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Diagnostic Procedures

  1. Perform Inspection/Maintenance (I/M) system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing Inspection/Maintenance (I/M) system check, go to next step.
  2. Ensure vehicle meets requirements listed in CONDITIONS FOR RUNNING . Turn all accessories off. Start engine and allow to idle. Road test vehicle. Accelerate at part throttle to 45 MPH. Maintain this speed for one minute. Perform 4 decelerations of 25 seconds each from 45 MPH while the throttle is closed, brakes are NOT applied, clutch is not actuated, transmission is not manually downshifted and vehicle speed remains above 25 MPH. After each deceleration period, return vehicle speed to 45 MPH under part throttle acceleration. Maintain for 15 seconds. If EGR System Status updates to YES, go to step  5. If EGR System Status does not update to YES, go to next step.
  3. Using scan tool, monitor DTCs. If any DTCs are set, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. If no DTCs are set, go to next step.
  4. Using scan tool, monitor NOT RAN SINCE CODE CLEARED display. Determine which DTCs required for YES status have not run. See INSPECTION/MAINTENANCE SYSTEM DIAGNOSTIC TROUBLE CODES  table. Enter DTC number in SPECIFIC DTC menu of scan tool. Operate vehicle within conditions for running DTC located in FREEZE FRAME/FAILURE RECORDS for DTC. Repeat procedure until scan tool indicates diagnostic test has run. Repeat step for any additional required DTCs that have not run. Using scan tool, observe I/M system status display. If EGR System Status display updates to YES, go to next step. If EGR System Status display does not update to YES, go to DIAGNOSTIC AIDS .
  5. Using scan tool, observe emission related DTC portion of I/M system status display. If scan tool indicates any emission related DTCs are set, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs are set, system is okay at this time.
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