Scan Tool Data List: Overview

DESCRIPTION
Use the TYPICAL SCAN DATA VALUES table only after the On-Board Diagnostic System Check has been completed, no DTC(s) were noted and you have determined the on-board diagnostics are functioning properly.

Scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The TYPICAL SCAN DATA values represent values that would be seen on a normally running engine.

NOTE: A scan tool that displays faulty data should not be used, and the problem should be reported to the scan tool manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed in the following articles are provided from the OE manual for use in diagnosis. If all values are within the typical range described below, refer to Symptoms for diagnosis.

TEST CONDITIONS
Idle / Upper Radiator Hose Hot / Closed Throttle / Transmission in Park / Closed Loop / Accessories Off / Brake Not Applied.

PCM DATA DESCRIPTION
This information will assist in tracking down emission or driveability problems since the displays can be viewed while the vehicle is being driven. Refer to the On Board Diagnostic (OBD) System Check for additional information.

The data messages displayed on the scan tool are divided into Engine, Specific Engine and DTC lists as follows:

ENGINE DATA
^ ENG 1- Contains general information regarding fuel delivery and basic engine operating conditions.

^ ENG 2 - Contains general information regarding IC, KS, EVAP, AC, and basic engine operating conditions.

SPECIFIC ENGINE DATA
^ EGR - Contains information specific to the Exhaust Gas Recirculation system flow diagnostics and the EGR valve pintle position sensor diagnostics. Also displays parameters required to verify proper EGR system operation.
^ CATALYST - Contains information specific to the TWC diagnostics and parameters required to verify proper mIC system operation.
^ HO2S - Contains information specific to the Heated Oxygen Sensor diagnostics and parameters required to verify proper HO2S operation.
^ MISFIRE - Contains information specific to the misfire diagnostics and parameters required to verify proper operation with regard to misfire.