Vehicle On-Board & Scan Tool Diagnostics

Engine Scan Tool Data List (Part 1 Of 5):

Engine Scan Tool Data List (Part 2 Of 5):

Engine Scan Tool Data List (Part 3 Of 5):

Engine Scan Tool Data List (Part 4 Of 5):

Engine Scan Tool Data List (Part 5 Of 5):

Use the Typical scan Data Values table only after the Powertrain On-Board Diagnostic System Check is completed, no DTCs were noted, and you have determined the on-board diagnostics are functioning properly. The 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.

IMPORTANT: 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 may result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referred to in this service manual for use in diagnosis. For further information on using the scan tool to diagnose the powertrain control module (PCM) and related sensors, refer to the applicable reference section listed below. If all values are within the typical range described below, refer to the Symptoms section for diagnosis. The Typical scan Data Values table contains all the parameters included in the following data lists arranged in alphabetical order:
^ Engine Data 1 - Contains general information regarding fuel delivery and basic engine operating conditions.
^ Engine Data 2 - Contains general information regarding ignition control (IC), knock sensor (KS), A/C, and basic engine operating conditions.
^ Catalyst Data - Contains information specific to the 3-way catalytic converter diagnostics and the parameters required to verify proper catalyst system operation.
^ EGR Data - Contains information specific to the exhaust gas recirculation (EGR) system flow diagnostics and the EGR valve pintle position sensor diagnostics. Also displays the parameters required to verify proper EGR system operation.
^ EVAP Data Contains information specific to the evaporative emissions (EVAP) control system. Also displays the parameters required to verify proper EVAP system operation.
^ HO2S Data - Contains information specific to the heated oxygen sensor (HO2S) diagnostics and the parameters required to verify proper HO2S operation.
^ Misfire Data - Contains information specific to the misfire diagnostics and the parameters required to verify proper operation with regard to misfire.

IMPORTANT: Use the Typical Scan Data Values ONLY after the following conditions are met:
^ The Powertrain On-Board Diagnostic System Check is complete.
^ The engine is idling unless testing a value at a specified RPM.
^ The lower radiator hose is hot.
^ The throttle is closed unless testing a value at a specified RPM.
^ The vehicle is in PARK or NEUTRAL.
^ The vehicle is operating in closed loop.
^ The vehicle accessories are turned off.

For scan tool parameter definitions, refer to Engine Scan Tool Data Definitions.