Typical Scan Tool Data Values

Typical Scan Tool Data Values
The data messages displayed on the scan tool are divided into Engine, Specific Engine and Diagnostic Trouble Code (DTC) lists as follows:

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

Specific Engine Data
- EGR - Contains the information specific to the Exhaust Gas Recirculation System (EGR) and the Evaporative Emissions System (EVAP) required for diagnosis.
- Misfire - Contains information specific to the diagnosis of misfire and data required to verify proper operation with regard to misfire.
- O2S - Contains information specific to the Oxygen Sensor (O2S 1) and Rear Heated Oxygen Sensor (HO2S 2) diagnosis and data required to verify proper operation of the sensors.

DTC Data
- Freeze Frame - Contains information collected at the time a type A or type B DTC Malfunction Indicator Lamp (MIL) was illuminated. This allows the technician to re-create conditions when a MIL occurred and to verify proper operation with in these conditions.
- Failure Records - Contains the information at the time a diagnostic test failed and set a DTC. The failure records data is not necessarily associated with the MIL.