EECU electric circuit(Old)
Communication between the control units go via two data buses.
The two data buses have different functions. One is used for the control signals of system and is
designated SAE J1939.
The other databus, SAE J1708, is used for information and diagnostics. The link also functions as a back
up for the other databus if this for any reason does not function.
The Engine Management System (EMS) consists of a control unit (EECU) mounted to the engine, sensors
and a wiring harness. The EECU, Engine Electronic Control Unit, is connects to both the data bus SAE
J1939 and SAE J1708.
The unit receives signals from the Vehicle Control Unit, VECU.
It sends signals to control various functions on the engine and communicates with other control units via
the databuses.
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