RENAULT triber vehicle speed multiplexed information check antipoluction system

Описание: Vehicle speed multiplexed information refers to how a car's speed data (and other signals) is shared across a network of electronic control units (ECUs) using a single communication line, rather than dedicated wires for each signal, reducing complexity and cost by transmitting data like wheel speed (from ABS) to the engine, transmission, and instrument cluster via a Controller Area Network (CAN) bus, often seen in diagnostic codes like "Vehicle speed multiplexed information missing". 

How it works

Centralized Sensing: A sensor (often in the Anti-lock Braking System - ABS) detects wheel or transmission speed.

Multiplexing: This single speed signal, along with other data, is bundled and sent as digital messages (packets) over a twisted pair of wires (the CAN bus).

Information Sharing: Other ECUs (like the Engine Control Module, Transmission Control Module, instrument cluster) "listen" to the network and pick up the speed data they need. 

Benefits

Less Wiring: Fewer wires, connectors, and reduced weight.

Cost Reduction: Cheaper due to less material.

Increased Reliability: Fewer connection points mean fewer potential failures.

Integrated Control: Allows different systems (traction control, cruise control, speedometer) to work together seamlessly. 

Common issues

Diagnostic Codes: A code like "Vehicle speed multiplexed information missing" (DTC) indicates a problem with this shared signal, often pointing to a faulty sensor or network issue, preventing ECUs from getting accurate speed data. 

Example scenario

The ABS module reads wheel speed, sends it as a multiplexed signal on the CAN bus, and the engine module uses it for traction control, while the instrument cluster uses it to show the driver the speedometer reading.