CAN Register And Communication Line Inspection

■ CAN register and communication line inspection 1 

1. Ignition OFF.
2. Connect all module connectors in proper locations.
3. Measure resistance between terminal 3 and 11 of diagnostic connector.

   Specification  : About 60 Ω

   Fig 1: C-CAN LOW & HIGH Circuit Diagram

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Identifying FATC, PCM, LDC, AAF, DLC, BMS & HCU Connector End Views

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?

   YES 

   • Check Each Module connector 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 120Ω CAN register (Inside of PCM and BMS) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • If the measured value is lower than 10Ω, 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 ∞ Ω, 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 

1. Ignition OFF.
2. Disconnect PCM and BMS connectors.
3. Measure resistance between terminal CAN Low and CAN High of ECM and BMS Modules.

   Specification  : About 120 Ω

   Fig 3: Measuring Resistance Between Terminal CAN LOW And CAN HIGH Of ECM & BMS Modules

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 4: Identifying FATC, PCM, LDC, AAF, DLC, BMS & HCU Connector End Views

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured value within specification?

   YES 

   • Go to next procedure.

   NO 

   • If the measured value is out of specification, repair or replace 120 Ω CAN register (Inside of PCM and BMS) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • If the measured value is lower than 10 Ω, 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 ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.