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Home >> Buick >> 2007 >> Allure CXS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - Troubleshooting & Diagnosis >> Inspection/Maintenance (I/M) Catalyst System Set Procedure >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  Perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 2:  The Catalyst Test runs during the specified cruise period.
  3. 3:  This step is to identify a first failure of a type B DTC. A DTC only appears on the I/M System Status display when it becomes a MIL illuminating DTC. This occurs on the second failure of a type B DTC. A first failure of a type B DTC will not allow the I/M System Status to update to YES. Refer to Diagnostic Aids.
  4. 4:  This step is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under Conditions for Running the DTC.
  5. 5:  The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance (I/M) Catalyst System Set Procedure

Step Action Yes No
1  Did you perform the Inspection/Maintenance (I/M) System Check? Go to Step 2  Go to Inspection/Maintenance (I/M) System Check 
2 
  1. Verify that the vehicle is operating within the Conditions for Running the DTC.
  2. Turn OFF all of the accessories. For example, the A/C system and the blower fan.
  3. Start and idle the engine.
    4. CAUTION: Refer to Road Test Caution .
    IMPORTANT: In order for this test to run, the vehicle must operate in the following conditions:
    • Acceleration at part throttle to 72-80 km/h (45-50 mph)
    • This speed maintained for 8-10 minutes or until the I/M System Status updates to YES
  4. With a scan tool, observe the I/M System Status display.
Did the Catalyst System Status update to YES?		 Go to Step 5  Go to Step 3 
3  With a scan tool, observe the DTC Information.
Does the scan tool indicate any failed DTCs?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 4 
4 
  1. Refer to the Inspection/Maintenance (I/M) System DTC Table  to determine which DTCs are required to run in order to complete this test.
  2. With a scan tool, observe the Not Ran Since Code Cleared display.
  3. Determine which of the DTCs required for a YES status has not run.
  4. Enter the DTC number in the Specific DTC menu of the scan tool.
  5. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  6. Repeat the procedure until the scan tool indicates the diagnostic test has run.
  7. Repeat steps 4-6 for any additional required DTCs that have not run.
  8. With a scan tool, observe the I/M System Status display.
Did the Catalyst System Status update to YES?		 Go to Step 5  Go to Diagnostic Aids
5  With a 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?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
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