Scan Tool Data Definitions: Overview

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
- Engine 1 - Contains general information regarding fuel delivery, Ignition Control (IC), Knock Sensor (KS), Evaporative Emission (EVAP) and basic engine operating conditions,
- Engine 2 - Contains general information regarding fuel delivery Output Controls (ODMs), Ignition Control (IC), and Air Conditioning (A/C), cruise control and basic engine operating conditions.

Specific Engine Data
- Misfire - Contains information specific to the diagnosis of misfire and data required to verify proper operation with regard to misfire.
- 02S - Contains information specific to the Oxygen Sensor (025 1) and Rear Heated Oxygen Sensor (H025 2) diagnosis and data required to verify proper operation of the sensors.

DTC Data
- Freeze Frame - Contains information collected at the time a DTC was set to allow the technician to re-create conditions when a fault occurred and to verify proper operation within these conditions.