If the High-Speed Controller Area Network (CAN) is something you don’t deal with often, here are a few basics to refresh your memory.

Controller Area Network (CAN)

  • Standard protocol for communication between vehicle control systems.
  • Developed because vehicles have increasing numbers of electronic control systems that require communication between individual control units.
  • CAN control units are connected in parallel (e.g., ECU, TCU, ADAS*, and ESC*) and upload their data to the network (or BUS) so it can be shared with other control units that need this data.
  • Key Advantages
    • Simple structure capable of fast communication
    • Requires less wiring and lowers vehicle weight
    • Provides efficient system control
    • Reduced cost
    • Ease of adding and controlling different devices on the CAN bus
    • Twisted-pair wiring is highly tolerant to electrical noise, so data is protected

Wiring Basics

CAN Wiring

  • Twisted pair wiring
  • Tolerant to electrical noise

Terminating Resistors

  • 120 Ω each
  • At the ends of each network
  • Prevents reflective signal waves and stabilizes voltage signal

Communication Waveform

  • There are two signals: CAN High and CAN Low
  • These two signals have opposite phases (binary data)

Waveform Scope Pattern

  • CAN High rises to 3.5 V from 2.5 V
  • CAN Low drops to 1.5 V from 2.5 V
  • Voltage level is used as a data communication language
  • Binary numbers for this language are translated by measuring the output voltage differences

As always, use KGIS to find the most current service information, and thank you for supporting Kia Technical Training!

Sistemas de control electrónico CAN de alta velocidad KGIS Técnico

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