Decoding BFAX OBD2 in Stripe: A Guide to Reading Data with ELM327

Understanding how to access diagnostic data from your vehicle is crucial for maintenance and performance tuning. For older bikes, especially those predating EURO5 standards, the systems might not fully adhere to the generic OBD2 protocols. This article delves into reading data from systems that, while not strictly OBD2 compliant, utilize similar principles and can be accessed using tools like the ELM327 interface, focusing on what we’ll call “Bfax Obd2 In Stripe” – a method to meticulously examine and interpret the data stream.

To effectively communicate with these systems, it’s essential to understand that while the raw data might resemble standard OBD messages over the K-line (like CARB protocol 5), the decoding process might differ. Before 2021 and EURO5 regulations, manufacturers had more flexibility in implementing diagnostic communication. Therefore, a standard OBD2 application might not work directly. However, with the right approach, an app programmed to interpret the data according to the specific system’s standard (potentially similar to KDS) can utilize ELM327 to successfully read and display valuable information.

The ISO14230 standard provides a foundation, defining timing, headers, and the initialization process for communication. Generally, with an ELM327 adapter, you can establish communication and request data using a sequence of AT commands. A typical initialization string might look like this:

AT Z
AT D
AT H1
AT L1
AT S1
AT SP5
AT SH C133F1
81 0100
03 07

These commands configure the ELM327 to reset, set defaults, enable headers and linefeeds, disable spaces, set silent monitoring off, specify the ISO 14230-4 (KWP2000) protocol, and set the CAN header. The subsequent lines 81 0100 and 03 07 are examples of diagnostic requests.

However, systems like “BFAX OBD2 in stripe” often employ physical addressing to target specific ECUs. This involves using headers in the format 81XXYY, where XX represents the ECU address and YY is the diagnostic tool address (typically F1). We’ve observed the use of headers like 8111F1 and mode $21 (show current data) with PIDs (Parameter IDs) to retrieve live data.

To read data using ELM327 from such systems, consider the following setup sequence, which incorporates header manipulation:

ATSP5
ATWM8011F1013E
ATSH8111F1
ATFI
ATSH8011F1

Let’s break down these commands:

• ATSP5: Sets the protocol to ISO 14230-4 (KWP2000).
• ATWM8011F1013E: Sets the wakeup message to 01 3E. This keepalive message is crucial for initiating and maintaining communication.
• ATSH8111F1: Changes the header to 0x81 + Sender (ECU address, here 11) + Receiver (Tool address, F1). This is for initial communication and potentially specific requests.
• ATFI: Initiates Fast Initialization, a quicker startup procedure for KWP2000.
• ATSH8011F1: Changes the header back to 0x80 + Sender + Receiver. The reason for switching back to 80 after fast init, having used 81 initially, could be related to specific ECU communication protocols or addressing modes used after the initial handshake. It might indicate a transition from physical addressing (81...) to a more general or functional addressing (80...) for subsequent data requests.

Following this setup on an ELM327 interface should enable communication and data retrieval from “BFAX OBD2 in stripe” systems. The header change after AT FI (from 8111F1 to 8011F1) is a key aspect to consider, likely related to the nuances of the diagnostic protocol implementation in these specific systems. Further investigation into the specific ECU addressing scheme and data request formats for “BFAX OBD2” would provide a more complete understanding and robust data reading capability.