m a x A I 4 3 0 i v T E C H N I C A L M A N U A L
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Rev C 6/17/2020
Once the list of active faults screen is closed the icon
will illuminate on the top right corner of the screen
to indicate that an active fault is present.
4. Understanding Data-Bus Operation
… data-bus is like an information super-highway in the vehicle…
4.1 Data-Bus Basics
While this information applies to many types of data-busses, the maxAI 430iv operates exclusively over
the SAE J1939 data-bus.
The data-bus is like an information super-highway in the vehicle. A data-bus allows various controllers,
such as the engine controller, transmission controller, chassis controller, etc. to communicate with each
other and any other components connected to the data-bus.
Most new diesel engines are controlled by an Engine Control Module (ECM) that uses information from
various sensors to adjust operating parameters, such as fuel injection, to optimize power, increase fuel
economy, and lower emissions. The data-bus enables the ECM to send/receive vast amounts of
information to/from the transmission computer or any other computer connected to the data-bus, greatly
simplifying the vehicle’s electrical system.
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