Powertrain Control Software: Multiplexing

The increased number of modules on the vehicle dictates a more efficient method of communication. Multiplexing is the process of communicating several messages over the same signal path. This process allows multiple modules to communicate with each other through the signal path (BUS+/BUS-). Modules communicate with the PCM using controller area network (CAN) which determines the priority in which the signals are sent. (See CONTROLLER AREA NETWORK  for more information.) Multiplexing reduces the weight of the vehicle by reducing electrical wiring.