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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1026 (Engine Controls - 6.6L (Lb7) (Troubleshooting & Diagnosis) >> Troubleshooting >> Inspection/Maintenance (I/M) Component Monitoring System Set Procedure >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 1:  Ensure that you perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 3:  This step identifies a first failure of a type B DTC. A DTC only appears on the I/M System Status display when the DTC 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.
  3. 4:  This step helps identify any unique or any 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.
  4. 5:  The I/M System Status only reports on whether or not a diagnostic test has run, not the outcome of the test. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance (I/M) Component Monitoring 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. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  2. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  3. Start the engine, and allow the engine to idle for 2 minutes.
    4. CAUTION: Refer to Road Test Caution in Cautions and Notices.
    IMPORTANT: In order for this test to run, the vehicle must operate in the following conditions:
  4. Acceleration at part throttle to 80 km/h (50 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 10 minutes depending on the start up coolant temperature.
  5. Continue the operating conditions for an additional 3 minutes after the engine reaches operating temperature.
  6. After the specified time has elapsed, vehicle requires acceleration at 75 percent throttle until a speed of 110 km/h (68 mph) is attained.
  7. Review the I/M System Status display with a scan tool.
Did the Component Monitoring System Status update to YES?		 Go to Step 5  Go to Step 3 
3  Observe the DTC Information with a scan tool.
Does the scan tool indicate any failed DTCs?		 Go to Diagnostic Trouble Code (DTC) List 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. Observe the Not Ran Since Code Cleared parameter with a scan tool.
  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. Observe the I/M System Status with a scan tool.
Did the Component Monitoring System Status update to YES?		 Go to Step 5  Go to Diagnostic Aids
5  Observe the Emission Related DTC portion of the I/M System Status with a scan tool.
Does the scan tool indicate any Emission Related DTCs set?		 Go to Diagnostic Trouble Code (DTC) List System OK
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