Component Inspection

Check CAN communication waveform generation
1. Ignition "OFF"
2. Connect each channel scope to CAN-HIGH terminal and CAN-LOW terminal.
3. Ignition "ON" after disconnecting only PCM to CAN BUS.
4. Ignition "ON" after disconnecting only ABS/ESC ECM to CAN BUS.
5. Ignition "ON" after disconnecting only Instrument Cluster to CAN BUS.
  1. Specification: At Ignition "ON", the waveform same as "Signal Waveform & Data" of above signal waveform
  - 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 1: Checking CAN Communication Waveform (1 Of 2)
  Courtesy of HYUNDAI MOTOR CO.
  
  Fig 2: Checking CAN Communication Waveform (2 Of 2)
  Courtesy of HYUNDAI MOTOR CO.
6. Does correct waveform generate from each module?
  YES
  1. Go to VERIFICATION OF VEHICLE REPAIR .
  NO
  1. Replace the module which generates poor communication waveform, and go to VERIFICATION OF VEHICLE REPAIR .