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View| Protocol | Arduino Add-on | | :--- | :--- | | | MCP2515 CAN module + TJA1050 transceiver | | K-Line (ISO 9141) | Simple voltage divider (5V to 12V) + transistor switch | | J1850 VPW | At least a comparator (LM393) or dedicated MC33390 chip | | J1850 PWM | Tricky – requires separate transmit/receive lines |
The question is inevitable: Can the little Arduino talk to the mighty J2534? j2534 arduino
Before J2534, if a shop needed to update the firmware on a Ford transmission, they needed a Ford-specific tool. If they needed to program a GM airbag module, they needed a GM tool. J2534 mandated that manufacturers support "pass-thru" programming, allowing a single hardware device to work with OEM software from any manufacturer. | Protocol | Arduino Add-on | | :---
The short answer is: The long answer requires understanding the electrical, software, and legal boundaries of the J2534 standard. An Arduino can fully reflash these because they
Many aftermarket ECUs (Megasquirt, Speeduino, EMU Black) use simple serial or CAN. An Arduino can fully reflash these because they do not require the J2534 DLL. Connect an Arduino to Megasquirt's CAN bus, and you have a $20 bootloader.
And that little 16 MHz chip? It turns your garage into a laboratory.