Reflashing and relearning are common terms in automotive diagnostics, but they’re often confused. This article clarifies the difference between these procedures and answers the question: Can You Reflash A Computer With A Scan Tool?
Understanding the distinction between reflashing and relearning is crucial for accurate vehicle diagnostics and repair. While both involve vehicle computers, they serve different purposes and require different tools and procedures. Let’s break down each process:
Reflashing: Updating Vehicle Software
Reflashing, also known as reprogramming or flashing, updates a vehicle’s computer software with a newer version from the Original Equipment Manufacturer (OEM). Think of it like updating your phone’s operating system. These updates often address bugs, improve performance, or introduce new features. A reflash is typically necessary when a Technical Service Bulletin (TSB) identifies a software-related issue.
Performing a reflash requires specialized equipment:
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J2534 Pass-Thru Device: This device acts as an interface between a Windows computer and the vehicle’s OBD-II port, allowing the new software to be transferred. Using a dedicated pass-thru device is more efficient than tying up a scan tool for this potentially lengthy process.
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PC with Internet Connection: The OEM software is downloaded to the PC and then transferred to the vehicle through the pass-thru device.
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OEM Software and License: Access to the manufacturer’s website and a valid license are required to download the correct software.
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Stable Power Supply: A regulated power supply is essential to prevent interruptions during the reflashing process, which can damage the vehicle’s computer.
J2534 Toolbox Software: This software, installed on the PC, manages the communication between the computer and the pass-thru device. It also provides valuable training resources for technicians.
Relearning: Introducing New Components
Relearning, also referred to as resetting or calibration, is necessary when a major component is replaced in a vehicle. It allows the vehicle’s computer to recognize and communicate with the new part. Think of it as introducing a new member to the family. This process often involves resetting adaptive values or performing specific procedures outlined in the service manual.
Relearning is typically done with a scan tool:
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Scan Tool Functionality: Modern scan tools offer built-in relearn procedures. They can guide technicians through the necessary steps and often automate the process.
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Guided Procedures: Scan tools provide step-by-step instructions, making the relearn process straightforward. For instance, after replacing a crankshaft position sensor, a CKP variation relearn might be required.
So, Can You Reflash with a Scan Tool?
While some high-end scan tools might offer limited reflashing capabilities, generally, you cannot reflash a computer with a standard scan tool. Reflashing requires the dedicated J2534 Pass-Thru device and associated software for a safe and reliable update. Scan tools are primarily designed for diagnostics, relearning, and other maintenance tasks.
Conclusion: The Right Tool for the Job
Reflashing and relearning are distinct procedures with different purposes and tool requirements. Reflashing updates the vehicle’s software using a J2534 Pass-Thru device, while relearning introduces new components to the vehicle’s computer using a scan tool. Understanding this difference is essential for proper vehicle repair and maintenance. Consult OEM service information and use the correct tools to ensure a successful outcome. Using a professional service like a Pass-Thru Assistant can be a valuable resource for shops that don’t perform reflashes frequently.
