Most modern automotive scan tools come equipped with bi-directional control capabilities, yet many technicians and DIY enthusiasts primarily utilize them for reading diagnostic trouble codes and examining parameter data. Bi-directional control, in essence, is the ability of a scan tool to both receive information from and send commands to a vehicle’s computer system. Vehicles today, with their sophisticated computer control systems, are designed to communicate with OBD2 scan tools, allowing them to request specific data, initiate tests, and command certain functions. You might also hear bi-directional controls referred to as actuator tests, functional tests, system tests, or active tests, all describing similar functionalities. Reprogramming modules is also considered a form of bi-directional control.
Understanding Bi-Directional Functionality in Scan Tools
What sets a bi-directional scanner apart from a standard OBD2 scanner is this very capability to send commands. Regular OBD2 scanners are limited to retrieving information – they act as listeners. A bi-directional control scan tool, however, allows for interaction. By performing active tests, a technician can directly command components to operate, isolating issues and verifying functionality in real-time. For instance, bi-directional controls enable you to cycle relay fans on and off or activate the fuel pump remotely to check for proper operation and diagnose intermittent problems. This level of control drastically reduces guesswork in diagnostics.
The Advantages of Utilizing Bi-Directional Auto Scan Tools for Diagnostics
Employing bi-directional auto scan tools significantly enhances the diagnostic process. Instead of merely reading error codes, which might point to a symptom rather than the root cause, bi-directional control allows for targeted component testing. This means mechanics can pinpoint problems faster and with greater accuracy. For example, if you suspect an issue with a cooling fan, a bi-directional test can directly activate the fan, bypassing the usual control system signals, to determine if the fan motor itself is faulty or if the problem lies elsewhere in the control circuit. This active testing approach is invaluable for diagnosing complex issues efficiently.
Examples of Practical Bi-Directional Tests
To illustrate the power of bi-directional control, consider these examples of active tests supported on a 2016 Chevy Silverado V8 5.3L engine. These examples are derived from our coverage checker, highlighting the extensive capabilities available. It’s important to note that bi-directional testing capabilities are often found in more advanced scan tools, such as our 5610, 5160RS, and tablet models.
One common test is the EVAP Purge Valve test. This test allows you to command the purge valve to open and close, verifying its function and the integrity of the evaporative emissions system. Another example is individual cylinder fuel injector testing, where you can activate or deactivate injectors one by one to assess their contribution to engine performance and identify potential misfires or fuel delivery problems. These are just a few examples; bi-directional control extends to numerous systems, including ABS, transmission, and more, depending on the vehicle and scan tool capabilities.
Note: https://www.innova.com/pages/coverage
