Typical Scan Tool Data Values

The Diagnostic Circuit is an organized approach to identifying a problem created by an Electronic Engine Control System malfunction. It must be the starting point for any drive ability complaint diagnosis, because it directs the service technician to the next logical step in diagnosing the complaint.

The "Scan Tool" data listed in the table may be used for comparison, after completing the On-Board Diagnostic System Check and finding the On-Board Diagnostics functioning properly with no trouble codes displayed. 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 typically 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 Tool" can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed are used for diagnosis. If a "Scan Tool" reads other parameters, the values are not recommended for use in diagnosis. For more description on the values and use of the "Scan Tool" to diagnosis Engine Control Module inputs, refer to the applicable component diagnosis. If all values are within the range illustrated, refer to ""Diagnosis by Symptom". Symptom Related Diagnostic Procedures





Test under the following conditions:
- Engine at Idle.
- Upper Radiator Hose Hot.
- Closed Throttle.
- Park or Neutral.
- "Closed Loop".
- All Accessories "OFF".