All ECM A-Chart

TYPICAL TECH 1 SCAN DATA VALUES
The Tech 1 scan data listed in this table may be used for comparison after completing the On-Board Diagnostic System Check and finding the on-board diagnostics functioning properly with no Diagnostic Trouble Codes (DTC) displayed. The "Typical Tech 1 Data Values" are an average of display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would 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 MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT.

Only the parameters listed below are used 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 use of the Tech 1 tool to diagnose ECM inputs, refer to "Procedures". [1][2]C Code Charts If all values are within the range illustrated refer to "Diagnosis By Symptom". Testing and Inspection

Tech 1 Tool Data:

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Tech 1 Tool Data (Continued):

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