What is Bi-Directional Auto Scanner?
A bi-directional auto scanner is a type of automotive diagnostic tool that allows communication between a vehicle's onboard control modules and the scanner itself. Unlike basic code readers that only retrieve data (read-only), a bi-directional scanner enables two-way communication. This means it can not only read data from the vehicle but also send commands to various systems and components for testing and troubleshooting.
Why you need Bi-Directional Auto Scanner?
A bi-directional auto scanner is useful because it can both read data from a car and send commands to test various systems. Here's why you need one:
1. Better Diagnostics: It helps you accurately identify problems by testing components like the fuel pump or sensors in real time.
2. Active Testing: You can control parts directly (like turning on lights or activating the ABS), which helps confirm if a part is working or not.
3. Calibration and Reprogramming: After replacing certain parts, like sensors, the scanner allows you to reset or calibrate the system so everything works properly.
4. Reset Warning Lights: You can reset maintenance reminders and warning lights, like after an oil change.
5. Save Time and Money: It helps you avoid unnecessary dealer visits for advanced diagnostics and repairs.
Bi-Directional Auto Scanner Use Case:
It's common for a Malfunction Indicator Light (MIL) / Check Engine Light on a vehicle to illuminate without any obvious sign of what might be wrong. A regular OBD2 diagnostic tool might return a diagnostic trouble code (DTC) showing that the Evap Purge Solenoid Circuit is causing the MIL.
Using the bi-directional controls, the purge valve is commanded open. The expectation is that fuel trim values should change based on what's in the gas tank. The fuel trim should decrease if the tank has a high concentration of fuel vapors. If there is a high concentration of oxygen, then the fuel trim should increase.
With the purge valve commanded open, there is no change in fuel trim. To confirm this figure, the purge valve is commanded open and shut several times. The fuel trim levels increase by the third time, indicating an open solenoid.
Based on this, the solenoid is sticking and should be replaced.
Suggestions of Bi-Directional Auto Scanner
Choosing the right bi-directional auto scanner can greatly improve your vehicle diagnostics. Whether you're a beginner or a professional, there are scanners available for every skill level and budget.
We will show you the Bi-Directional Auto Scanner from entry lever to professional lever.
Entry-Level Bi-Directional Auto Scanner
Autel MaxiCOM MK808
Features: Bi-directional control, basic diagnostic functions, supports a wide range of vehicle models.
Best for: Beginners or DIY enthusiasts looking for affordable yet functional tools.
Launch CRP129
Mid-Level Bi-Directional Auto Scanner
ThinkTool Pro
Features: Bi-directional control, full system diagnostics, ECU coding, and active tests.
Best for: Intermediate users or repair shops requiring more advanced functions without a high price tag.
Foxwell GT60 Plus
Features: Bi-directional tests, full diagnostics, live data streaming, and reset functions for over 60 car brands.
Best for: Mid-level users seeking an all-around tool for multiple vehicle systems.
Professional-Level Bi-Directional Auto Scanner
Autel Maxisys Elite II
Features: OE-level diagnostics, bi-directional control, ECU coding, and advanced features like J2534 programming.
Best for: Professional technicians who need comprehensive diagnostic solutions.
Launch X431 V+
Features: Professional bi-directional control, coding, and a broad range of diagnostic functions.
Best for: Professionals looking for wide vehicle coverage and top-level performance.
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