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: Screen Display - CAN Communication Waveform Generation

   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: PCM Circuit Diagram

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 3: PCM Connector End View

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured waveform normal?

   YES 

   • Go to "Verification of Vehicle Repair " below.

   NO 

   • Replace the module which generates poor communication waveform, and go to "Verification of Vehicle Repair " below.