Component Inspection

Check CAN communication waveform generation
1. IG "OFF" and connect each channel scope to CAN-HIGH terminal and CAN-LOW terminal.
2. IG "ON" after disconnecting only PCM to CAN BUS.
3. IG "ON" after disconnecting only ABS/ESC ECU to CAN BUS.
4. IG "ON" after disconnecting only Instrument Cluster to CAN BUS.
  Specification: At Ignition "ON", the waveform is same as the one of "Signal Waveform & Data".
  
  Fig 1: Display - CAN Communication Waveform
  Courtesy of HYUNDAI MOTOR AMERICA
  
  * Different from "Signal Waveform & Data", if 1) both CAN HIGH and LOW signal are fixed at 2.5 V or 2) HIGH and LOW signal are fixed at 3.5 V and 1.5 V, respectively, it is due to communication error between modules.
  
  Fig 2: Measuring Signal Waveform Between Data Link Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 3: Identifying Data Link Connector CAN-High And CAN-Low Connector Terminals
  Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured waveform normal?
  YES
  - Go to "VERIFICATION OF VEHICLE REPAIR ".
  NO
  - Replace the module which generates poor communication waveform and go to "VERIFICATION OF VEHICLE REPAIR ".