Scan Tool Data List

Typical Scan Values:

Typical Scan Values:

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 "Typical Values," 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.