Beyond the 16 Pins: A Deep Dive into Manufacturer-Specific OBD2 Protocols (KWP2000, ISO9141, CAN)
Last month, a repair shop nearly ordered a replacement ECU for a 2002 Mercedes Sprinter after their scanner couldn’t communicate with the ABS module. The tool was fine, the OBD2 port had power, but the data stream was silent. The culprit wasn’t the vehicle or the scanner—it was the diagnostic cable’s inability to speak the […]