CAN communication circuit inspection

■ CAN communication line inspection 

1. IG KEY OFF.
2. Disconnect HCU connector and ESC connector.
3. Measure the resistance between CAN-HIGH terminal of HCU harness connector and CAN-HIGH terminal of ESC harness connector.
4. Measure the resistance between CAN-LOW terminal of HCU harness connector and CAN-LOW terminal of ESC harness connector.

   Specification:  below 1Ω

   Fig 1: HPCU Circuit Diagram

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: Identifying HPCU Connector Terminals

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

   YES 

   • Check Each Module 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.
   • Substitute with a known - good ESC and check for proper operation. If the problem is corrected, replace ESC and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Check for open/short in harness.
   • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.