CAN Register and Communication Line Inspection

WARNING: This page is about a different variant/trim than selected.

■ CAN Register and Communication Line Inspection 1

IG Key "OFF".
HCU, PCM, MCU, BMS, A.A.F, FATC Connector.
Measure resistance between terminal 3 and 11 of diagnostic connector.
Specification : About 60 Ω

Fig 1: C-CAN LOW And C-CAN HIGH Circuit Diagram
Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: HCU/MCU Connector Terminals
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured resistance within specification?
YES
- Check HCU, PCM, MCU, A A F, FATC, connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  Go to next procedure.
NO
- If the measured value is out of specification, repair or replace 120 CAN register (Inside of PCM and BMS and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  If the measured value is lower than 10, repair or replace CAN High and CAN Low are short each other. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  If the measured value is, repair or replace the open in CAN High/CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  Go to next procedure.

■ CAN Register and Communication Line Inspection 2

IG KEY OFF
Disconnect PCM connector and BMS connector.
Measure resistance between terminal CAN Low and CAN High of PCM.
Measure resistance between terminal CAN Low and CAN High of BMS.
Specification : About 120 Ω

Fig 3: HPCU Circuit Diagram
Courtesy of HYUNDAI MOTOR AMERICA

Fig 4: LDC Connector Terminals
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured value within specification?
YES
- Go to next procedure.
NO
- Substitute with a known-good "PCM, BMS" and check for proper operation. If the problem is corrected, replace "PCM, BMS" and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.