Scan Tool Data List

Typical Scan Data:

Typical Scan Data:

TYPICAL SCAN DATA VALUES
If after completing the On-Board Diagnostic (OBD) system check and finding the Tech 1 diagnostics functioning properly and no Diagnostic Trouble Codes (DTC's) displayed,the "Engine/Transmission Tech 1 Data Values" may be used for comparison with values obtained on the vehicle being diagnosed. The "Engine/Transmission Tech 1 DataValues," are an average of display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would display.

NOTICE: 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 misdiagnosis and unnecessary parts replacement.

Only the parameters listed in the images are used in this manual for diagnosis. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis. For more description on the values and use of the Tech 1 to diagnose Powertrain Control Module (PCM) inputs refer to the applicable C-Chart. If all values are within the range illustrated, refer to Diagnosis By Symptom.