CAN communication circuit inspection

Check CAN BUS Short to Ground
1. Ignition "OFF"
2. Disconnect CAN communication modules. (TCM, ECM, ESC, SAS, EHPS, SCC, SRS, EPB, Cluster)
3. Measure the resistance between CAN-HIGH terminal of DLC harness connector and chassis ground.
4. Measure the resistance between CAN-LOW terminal of DLC harness connector and chassis ground.
  Specification: Discontinuity (Infinite Ω)
  
  Fig 1: Measuring Resistance Between CAN-HIGH/LOW Terminal Of DLC And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured resistance within specification?
  YES
  - Go to " Check CAN BUS Short to battery".
  NO
  - Repair short to ground in circuit and go to "VERIFICATION OF VEHICLE REPAIR ".
Check CAN BUS Short to battery
1. Ignition "OFF"
2. Disconnect CAN communication modules. (TCM, ECM, ESC, SAS, EHPS, SCC, SRS, EPB, Cluster).
3. Ignition "ON"
4. Measure the voltage between CAN-HIGH terminal of DLC harness connector and chassis ground.
5. Measure the voltage between CAN-LOW terminal of DLC harness connector and chassis ground.
  Specification: 0V
  
  Fig 2: Measuring Voltage Between CAN-HIGH/LOW Terminal Of DLC And Chassis Ground
  Courtesy of HYUNDAI MOTOR AMERICA
6. Is "voltage" display near the specified value?
  YES
  - Go to " Check CAN BUS Open".
  NO
  - Repair short to battery and go to "VERIFICATION OF VEHICLE REPAIR ".
Check CAN BUS Open
1. Ignition "OFF
2. Disconnect CAN communication modules. (TCM, ECM, ESC, SAS, EHPS, SCC, SRS, EPB, Cluster).
3. Check continuity between CAN-HIGH terminal of DLC harness connector and CAN HIGH terminal of each module.
4. Check continuity between CAN-LOW terminal of DLC harness connector and CAN LOW terminal of each module.
  Specification: Continuity (below 1.0Ω)
5. Is the measured resistance within specification?
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Repair open in CAN BUS and go to "VERIFICATION OF VEHICLE REPAIR ".