CAN Communication Line Inspection

■ Check Short to Battery in CAN Communication Line. 

1. Ignition OFF
2. Disconnect all related module connectors.
3. Ignition ON
4. Measure voltage between CAN high terminal (# 3) of diagnostic connector and chassis ground.
5. Measure voltage between CAN low terminal (#11) of diagnostic connector and chassis ground.

   Specification  : approx. 0V

■ Check Short to Ground in CAN Communication Line 

1. Ignition OFF.
2. Disconnect all related module connectors.
3. Measure resistance between CAN high terminal (# 3) of diagnostic connector and chassis ground.
4. Measure resistance between CAN low terminal (# 11) of diagnostic connector and chassis ground.

   Specification  : ∞ Ω

   Fig 1: C-CAN Low Circuit Diagram

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: HCU/MCU Connector Terminals

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

   YES 

   • Check PCM, MDPS, TPMS, ABS and 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.

   NO 

   • Check short to battery in communication line. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • Check short to ground in communication line. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.