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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> General Information >> OEM General Information >> Vehicle Diagnostic Information >> Diagnostic Information and Procedures >> Inspection/Maintenance (I/M) System Check >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: Many DTC related repairs will instruct the technician to clear the DTC information. Clearing the DTC will reset the I/M System Status indicators to NO. Performing the I/M Complete System Set Procedure will set each of the I/M System Status indicators to YES.
  1. Observe the Engine DTC information with a scan tool.

    If a DTC is set that would prevent the I/M System Status tests from completing, diagnose that DTC before continuing. Refer to Inspection/Maintenance (I/M) System DTC Table 

  2. Review applicable service bulletins for software updates that would prevent the I/M System Status tests from completing.

    3. If a control module re-program or other repair is required, perform the Inspection/Maintenance (I/M) Complete System Set Procedure .

  3. Observe the I/M System Status indicators.

    4. If any I/M System Status indicators report NO, perform the Inspection/Maintenance (I/M) Complete System Set Procedure .

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