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Chapter 6 OBD-II/EOBD Operations
OBD-II/EOBD allows you to access Generic OBD-II scan tool tests without completing a vehicle
identification. This option presents a quick way to check for diagnostic trouble codes (DTCs),
isolate the cause of an illuminated malfunction indicator lamp (MIL), check monitor status prior to
emissions certification testing, verify repairs, and perform a number of other services that are
emissions-related. OBD-II/EOBD is also used for testing OBD-II compliant vehicles that are not
included in the scan tool databases.
6.1 OBD Direct
Selecting OBD Direct opens a menu with two options:
• OBD Diagnose
• OBD Training Mode
Selecting either opens a menu with these options:
• Start Communication begins the test session
• Select Communication Protocol allows you to select which protocol to use
• Connector Information provides data link connector (DLC) location details for most models
• End of Diagnosis ends communication between the scan tool and the vehicle
The OBD Training Mode is a demonstration program that allows you to access OBD-II/EOBD
scan tool functions without connecting to a vehicle. Operation is the same as for OBD Diagnose,
however, data values are static.
6.1.1 Start Communication
Use the following procedure to conduct an OBD-II/EOBD test session:
z To perform an OBD-II/EOBD Test:
1. Tap Start Communications on the OBD Direct menu.
A vehicle type menu with 2 option displays:
– 12V Light Duty Vehicle
– 24V Heavy Duty/Goods Vehicle
2. Select a vehicle type from the list.
A generic connection message displays (Figure 6-1).
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