Most advanced automotive diagnostic tools come equipped with bi-directional control capabilities. However, many technicians and DIY enthusiasts primarily utilize these tools for reading diagnostic trouble codes and examining live data parameters. Bi-directional control, in essence, refers to the two-way communication between a diagnostic tool and a vehicle’s computer system. Modern vehicles are designed to allow OBD2 scanners to send requests and receive responses, enabling specific tests and functional commands. You might also hear bi-directional controls referred to as active tests, functional tests, system tests, or similar terms, all describing the same powerful diagnostic feature. Reprogramming modules is also considered a form of bi-directional control.
What sets a bi-directional scanner apart from a standard OBD2 scanner is this ability to send commands in addition to reading data. This interactive capability is the core of bi-directional control. By performing active tests, mechanics can pinpoint malfunctions with greater accuracy. For instance, bi-directional controls allow technicians to directly command components like relay fans or fuel pumps to turn on or off. This direct control helps in isolating issues by testing component functionality independently of normal operating conditions.
Here are examples of bi-directional tests supported on a 2016 Chevy Silverado V8 5.3L engine, as indicated by our coverage checker. It’s important to note that bi-directional testing is typically found in more advanced scan tools, such as Innova’s 5610, 5160RS, and tablet models.
Note: https://www.innova.com/pages/coverage
The video below demonstrates the bi-directional capabilities of the Innova 5610 in action, showcasing a purge valve diagnosis using an active test.
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Another practical example of a bi-directional active test achievable with the Innova 5610 scanner.
