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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Inspection/Maintenance (I/M) Complete System Set Procedure

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The purpose of the inspection/maintenance (I/M) complete system set procedure is to satisfy the enabled criteria necessary to execute all of the I/M system monitors. When all system monitors are completed, the I/M system status indicators are set to YES. Perform this procedure when more than one of the I/M system status indicators are set to NO.

Conditions for Meeting a Cold Engine
    • The battery voltage is between 11-18 volts.
    • The engine coolant temperature (ECT) is between 57-104°C (133-219°F).
    • The intake air temperature (IAT) is more than 5.25°C (41.5°F).
    • The barometric pressure (BARO) is more than 74 kPa.

Diagnostic Aids

If there is an impending failure, the system may require more time than was allotted in the system set procedure. If any DTCs do not run and the DTC is set, review the appropriate scan tool data list and service information. This will give an indication of why the DTCs do not run. Some may abort due to changes in the conditions while running. For example, changes in engine load, such as a cooling fan or A/C compressor clutch turning ON, may cause a DTC to abort. If the I/M system status does not update to YES, the procedure can be repeated until a YES status is achieved.

Circuit/System Verification

Review the I/M system status indicators. All I/M system status indictors should report YES.

Circuit/System Testing

Important: 

   • Any DTCs set, even those not listed in the I/M system DTC table, may prevent the required DTCs from running.
   • Perform the Inspection/Maintenance (I/M) System Check before continuing this diagnostic.

  1. Ensure the vehicle is within the Conditions for Running, as specified in the supporting text.
  2. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  3. Set the vehicle parking brake.
  4. Verify the transmission is in PARK for automatic transmissions, and NEUTRAL for manual transmissions.
  5. Start and allow the engine to idle for 2 minutes.
  6. Refer to Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to update the misfire monitoring I/M system status to YES.
  7. Observe the Not Ran Since Code Cleared display with a scan tool and determine which of the DTCs required for a YES status have not run.
  8. Enter the DTC number in the Specific DTC menu of the scan tool.
  9. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  10. Repeat steps 8 and 9 for any additional required DTCs that have not run.
    11. ⇒If the I/M System Status did not update to YES, refer to Diagnostic Aids.
  11. Observe the emission related DTC portion of the I/M system status display with a scan tool.
    12. ⇒If the scan tool indicates any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.