For automotive technicians and dedicated DIY mechanics, enhanced scan tools are indispensable. While many users are familiar with reading diagnostic trouble codes (DTCs) and examining parameter identification (PIDs) data, the power of bi-directional control often remains untapped. Bi-directional control refers to the capability of a diagnostic tool to both receive information from and send commands to a vehicle’s computer system. In modern vehicles equipped with sophisticated computer control units, this functionality allows an OBD2 scan tool to go beyond passive reading and actively request information or command specific tests and functions. You might also hear bi-directional controls referred to as actuator tests, functional tests, system tests, or active tests, all describing the same powerful diagnostic feature. Reprogramming capabilities are also considered a form of bi-directional control, further expanding the tool’s utility.
What Sets Bi-Directional Scan Tools Apart?
A bi-directional scan tool is a significant step up from a basic OBD2 scanner. Standard OBD2 scanners primarily retrieve data from the vehicle’s computer. In contrast, a bi-directional tool empowers you to send commands, initiating active tests to pinpoint issues effectively. This bi-directional control is crucial for comprehensive diagnostics. By performing these active tests, mechanics can directly assess the operational status of various components and systems, quickly identifying malfunctions. For instance, bi-directional controls enable you to command relay fans to turn on or off, or cycle the fuel pump, allowing for targeted testing of component functionality and circuit integrity.
Consider these examples of bi-directional tests supported on a 2016 Chevy Silverado V8 5.3L engine, as verified by our coverage checker. It’s important to note that bi-directional testing is a feature found in our more advanced models, such as the 5610, 5160RS, and our tablet-based scan tools, reflecting the enhanced capabilities required for this level of diagnostic interaction.
Note: Explore vehicle compatibility for bi-directional controls with our Coverage Checker.
The video above demonstrates the bi-directional capabilities of the Innova 5610 in action, showcasing a purge valve diagnosis. This active test is just one example of how bi-directional control enhances diagnostic precision.
Another practical illustration of a bi-directional active test achievable with the Innova 5610 highlights the tool’s versatility and depth in automotive diagnostics. By leveraging scan tools with bi-directional control, technicians can move beyond simple code reading to actively engage with the vehicle’s systems, leading to faster, more accurate diagnoses and efficient repairs.
