![]() ![]() Here in North America, early versions of this system are very uncommon. With an oscilloscope, I was able to determine the signalling characteristics and baud rate, and a logic analyzer revealed some basic information about the protocol. OverviewĮarlier versions of Rover MEMS (Modular Engine Management System) use a round three-pin diagnostic socket and a proprietary software protocol known as ROSCO (ROver Service COmmunications). I also noted the idle error, ignition advance, and coil time fields in the data frame for command 80. I've added a new table toward the end of this article with a start to the description of this data structure. ![]() : I learned that the ECU's 32-byte response to the command 7D is also a frame of diagnostic data, and it contains some lambda sensor voltage and fuel trim information. : Converted the data frame offsets to hex and added a few more fields. ![]()
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