Ranger 2WD V6-3.0L (2008)
Information Bus: Description and Operation
COMMUNICATIONS NETWORK
NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).
Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is
used for diagnostic use only, and CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking, is
a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication
requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network
reduces the number of wires, combining the signals on a single network. Information is sent to individual control modules that control each function.
The vehicle has 2 module communication networks:
-
ISO 9141
-
High speed (HS) CAN
Both networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be
able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel.
Network Topology
ISO 9141 Network Operation
The ISO 9141 communications network is a single wire network. The ISO 9141 communication network is used only by the ABS module.
