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Diagnostic Procedures

  1. If I/M system check has been performed, go to next step. If I/M system check has not been performed, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
  2. Turn off all accessories, including A/C and blower fan. Start engine and allow it to idle. Accelerate at part throttle to 55 MPH and maintain speed for 5 minutes. Decelerate to a stop. Allow engine to idle for 2 minutes with service brake applied and transmission in Drive. Using scan tool, monitor I/M system status display. If CATALYST system status updates to YES, go to step  5. If CATALYST system status did not update to YES, go to next step.
  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, monitor DTC P0420. Operate vehicle within code enable criteria for DTC P0420. See DTC P0420: CATALYST SYSTEM LOW EFFICIENCY  under DIAGNOSTIC TESTS. Operate vehicle within code enable criteria until scan tool indicates diagnostic test has run. Using scan tool, observe I/M system status display. If CATALYST system status updates to YES, go to next step. If CATALYST system status did not update to YES, see 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, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs, system is okay.
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