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Home >> Pontiac >> 2001 >> Sunfire GT, 2.2 4 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 2.2L & 2.4L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Catalyst System Set Procedure >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK  . After performing I/M system check, go to next step.
  2. Turn all accessories off. Start engine and allow to idle. Operate vehicle in the following manor:
    • 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, A/T in drive or M/T in neutral with clutch depressed.
    • Using scan tool, monitor I/M SYSTEM STATUS. If CATALYST SYSTEM STATUS is YES, go to step  5 . If CATALYST SYSTEM STATUS is not YES, go to next step.
  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, 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: TWC SYSTEM - LOW EFFICIENCY (2.2L)  or DTC P0420: TWC SYSTEM - LOW EFFICIENCY (2.4L)  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. If CATALYST SYSTEM STATUS is YES, go to next step. If CATALYST SYSTEM STATUS is not YES, see DIAGNOSTIC AIDS  .
  5. Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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