Reflects data for the throttle position instead.ĭBC multiplexing and extended multiplexing is an advanced topic and not supported by all data processing tools. In this example, it means that byte 4 reflects dataįor vehicle speed. Multiplexer switch value of 13 should be taken into account. It means that only signals that are A) part of the S1 group and B) have a The two OBD2 PIDs, speed and throttle position.Įxtended multiplexing works as before: If S1 takes the value 13 (HEX 0D), Service in the syntax, adding an M after m1 and being grouped with To see this, note that S1 takes the same role as Multiplexing, where a multiplexed signal (in this case S1) can also be a multiplexor and thusĬontrol the interpretation of other parts of the data payload. The above is referred to as simple multiplexing. The signal S1 is multiplexed by Service, which is evident from the SG_MUL_VAL_ field where the two are grouped.Īs evident, the signal S1 has the value m1 after the signal name, which means that if the Service signal takes the value 1, the data reflects the OBD2 service mode In this case, it toggles which OBD2 service mode is used (mode 01, 02. SG_ WheelBasedVehicleSpeed : (0.00390625,0) "km/h" Vector_XXXĬM_ BO_ 2364540158 "Electronic Engine Controller 1" ĬM_ SG_ 2364540158 EngineSpeed "Actual engine speed which is calculated over a minimum crankshaft angle of 720 degrees divided by the number of cylinders." ĬM_ BO_ 2566844926 "Cruise Control/Vehicle Speed 1" ĬM_ SG_ 2566844926 WheelBasedVehicleSpeed "Wheel-Based Vehicle Speed: Speed of the vehicle as calculated from wheel or tailshaft speed." īA_DEF_ BO_ "VFrameFormat" ENUM "StandardCAN","ExtendedCAN","reserved","J1939PG" īA_ "SPN" SG_ 2364540158 EngineSpeed 190 īA_ "SPN" SG_ 2566844926 WheelBasedVehicleSpeed 84 Īt the heart of a DBC file are the rules that describe how to decode CAN messages and signals: SG_ EngineSpeed : (0.125,0) "rpm" Vector_XXX
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