Vehicle On-Board & Scan Tool Diagnostics

Use the scan tool data values under the following conditions:
^ The Powertrain On-Board Diagnostic (OBD) System Check is complete.
^ The on-board diagnostics are functioning properly.
^ No DTCs are present.

The values below represent a typical display recorded from a properly functioning system.

Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of pans.

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 below were recorded under the following conditions:
^ Engine at Idle.
^ Upper radiator hose hot.
^ Closed throttle.
^ Transmission in PARK.
^ Closed Loop operation.
^ Accessories OFF.
^ Brake pedal not applied.