Scan Tool Data List

Typical Data Values:

TECH 1 SCAN TOOL DATA VALUES
If after completing the On-Board Diagnostic System Check and finding the Tech 1 scan tool diagnostics functioning properly, and no Diagnostic Trouble Codes (DTCs) stored in the Engine Control Module (ECM) memory, the "Typical Data Values" shown in the accompanying image may be used for comparison with the values obtained on the vehicle being tested. The "Typical 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.

DIAGNOSTIC PARAMETERS
Only the parameters listed in the accompanying image are used in this database for diagnosing. If a scan tool reads other parameters, those values are not recommended by General Motors for use in diagnosis. If all values are within the ranges indicated, refer to Diagnosis By Symptom. Testing and Inspection

DATA VALUE MEASURING CONDITIONS
The data stream scan values shown in the accompanying image are measured under the following conditions:

Engine running at idle
Upper Radiator Hose Hot
Closed throttle
Park or Neutral
System operating in "closed-loop"
Accessories "OFF."

ERRONEOUS DATA VALUES
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.