Scan Tool Testing and Procedures

Typical Tech 1 Data Values:

If after completing the FLOW OF DIAGNOSIS and finding the Tech 1 diagnostics functioning properly and no diagnostic trouble codes displayed, the "Typical Scan Values" may be used for comparison with values obtained on the vehicle being diagnosed. The "Typical Scan Values," are average display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would display.

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 CAN RESULT IN MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT.

Only the parameters listed below are used for diagnosing. If a scan reads other parameters, the values are not recommended by General Motors for use in diagnosing. For more description on the values and use of the Tech 1 to diagnose PCM inputs, refer to the applicable diagnosis section in "Component Testing". If all values are within the range illustrated, Testing and Inspection