Never use a scan tool that displays faulty data. The condition should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used in this manual for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis.
Scan tool values were recorded under the following conditions:
^ Idle
^ Upper radiator hose is hot
^ Closed throttle
^ Park or Neutral
^ Closed Loop
^ Accessories OFF
^ Brake not applied