Diagnostic Methods: Overview

The Diagnostic Methods Section provides information on routine diagnostic tasks.

When following powertrain diagnostics on on-board diagnostics (OBD) vehicles, the system may be checked by an off-board tester referred to as a diagnostic tool. This article contains information for carrying out diagnostics with a diagnostic tool. A diagnostic tool has certain generic capabilities that are standard across the automotive industry in the United States and Canada. All functions are selected from a menu. Refer to the instruction manual provided by the tool manufacturer.