Diagnostic Tool Set-up and Functionality

The diagnostic tool must be connected to the data link connector (DLC) for communication with the vehicle.

The DLC is located in the passenger compartment. It is attached to the instrument panel and accessible from the driver seat.

The DLC is rectangular in design and capable of accommodating up to 16 terminals. The connector has keying features to allow easy connection. The vehicle connector and the test equipment connector have latching features that make sure the test equipment connector remains mated when properly connected.

The required diagnostic tool functions are listed below:

• Monitor, record, and playback of PIDs
• Freeze frame PID data
• Diagnostic test modes; self-test, clear diagnostic trouble codes (DTCs)
• Output state control
• Output test mode
• Resetting keep alive memory (KAM)
• Diagnostic monitoring test results for on-board diagnostic (OBD) on-board monitors
• On-board system readiness (OBD monitor completion status)

Some of these functions are described in this article. Refer to the diagnostic tool manufacturer's manual for specific information on diagnostic tool set-up and operation.