Use the scan tool data listed in this table for comparison after completing the On-board Diagnostic System Check, and finding the on-board diagnostics functioning properly with no trouble codes displayed. The Typical Scan Data Values are an average of display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would typically display. The values you get may vary due to low battery charge or other reasons, but they should be very close. A scan tool that displays faulty data should not be used, and the problem should be reported to the manufacturer. The use of a faulty scan tool can result in a mis-diagnosis and unnecessary parts replacement. Only the parameters listed below are used in this manual for diagnosis. If a scan tool reads other parameters, the values are not recommended by General Motors for use in diagnosis. For more description on the values and the use of a scan tool to diagnose ECM inputs, refer to applicable diagnosis. If all values are within the range illustrated, refer to Driveability Symptoms.