For automotive technicians and dedicated DIY mechanics aiming for in-depth vehicle diagnostics, understanding bi-directional control is crucial. While many enhanced scan tools boast this capability, it’s often underutilized, with users primarily focusing on reading diagnostic trouble codes and viewing parameter data. But what exactly is bi-directional control, and how can a bi-directional OBD2 scanner elevate your diagnostic process?
Understanding Bi-Directional Control in OBD2 Scanners
At its core, bi-directional control signifies a two-way communication pathway between devices. In modern vehicles governed by sophisticated computer systems, a bi-directional OBD2 scanner can not only receive information from the vehicle’s modules but also transmit commands to perform specific tests and functions. You might encounter bi-directional controls referred to by various names such as actuator tests, functional tests, system tests, or active tests – all pointing to the same advanced diagnostic feature. Even reprogramming functionalities fall under the umbrella of bi-directional controls.
The key differentiator between a bi-directional scanner and a standard OBD2 scanner lies in this command capability. Regular OBD2 scanners are limited to retrieving data passively. In contrast, a bi-directional OBD2 scanner empowers you to actively engage with the vehicle’s systems. By initiating active tests, mechanics can pinpoint malfunctions effectively. Imagine using bi-directional controls to command relay fans to cycle on and off or to activate the fuel pump remotely. These actions, performed through the scanner, allow for direct observation of component responses, thereby isolating issues that might remain hidden with read-only tools.
Consider these examples of bi-directional tests supported on a 2016 Chevy Silverado V8 5.3L engine, as demonstrated by our coverage checker. It’s important to note that bi-directional testing is typically found in more advanced scan tools, such as our 5610, 5160RS, and tablet models.
Note: https://www.innova.com/pages/coverage
As illustrated in this video featuring the Innova 5610, bi-directional capabilities enable a purge valve diagnosis to be executed directly from the scan tool.
Another practical application of bi-directional active tests with the Innova 5610 is shown here, further highlighting the power and versatility of a bi-directional OBD2 scanner in modern automotive diagnostics.
