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Module Communications Network - Communications Network Description and Operation OVERVIEW A high speed controller area network (CAN) bus is used to transfer data between the engine control module (ECM) and instrument cluster. The diagnostic socket is also connected to the high speed CAN bus and allows the Land Rover approved diagnostic system to interrogate both the ECM and instrument cluster software. The CAN bus is a high speed broadcast network where control modules automatically transmit information every few microseconds. Information is broadcast down a pair of twisted wires, known as 'CAN high' and 'CAN low'. Information is transmitted on the CAN bus as a voltage difference between the 2 wires. CONTROL DIAGRAM • NOTE: D = High speed CAN bus Item Part Number Description 1 - Instrument cluster 2 - Diagnostic socket 3 - ECM |