Signal Circuit Inspection

Check open in harness
1. IG "OFF" and disconnect ECM and IDB connector.
2. Check resistance between CAN-HIGH terminal of ECM harness Connector and CAN-HIGH terminal of IDB harness connector.
3. Check resistance between CAN-LOW terminal of ECM harness Connector and CAN-LOW terminal of IDB harness connector.
  Specification: Below 1.0Ω
  
  Fig 1: Checking Resistance Between CAN (Low And High) Terminal Of ECM And IDB
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 2: Identifying CAN (Low And High) Connector Terminals (1 Of 2)
  Courtesy of HYUNDAI MOTOR AMERICA
  
  Fig 3: Identifying CAN (Low And High) Connector Terminals (2 Of 2)
  Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?
  YES
  - Substitute with a known-good IDB and check for proper operation. If the problem is corrected, replace IDB and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Repair open in CAN BUS line and go to "VERIFICATION OF VEHICLE REPAIR ".