H-CAN Communication Circuit Inspection

■ H-CAN Communication Line Inspection 

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

   Specification  : Below 1Ω

   Fig 1: MCU Circuit Diagram

   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 PCM and check for proper operation. If the problem is corrected, replace PCM 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.