CAN Communication Line Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check Short to Battery in CAN Communication Line.

IG key "OFF".
Disconnect HCU, PCM, MCU, BMS, A A F, FATC connector.
IG KEY "ON"
Measure voltage between CAN High Terminal (# 3) of diagnostic connector and chassis ground.
Measure voltage between CAN Low Terminal (#11) of diagnostic connector and chassis ground.

Specification : About 0V

■ Check Short to Ground in CAN Communication Line

IG KEY OFF
Disconnect HCU, PCM, MCU, BMS, A A F, FATC connector.
Measure resistance between CAN High Terminal (# 3) of diagnostic connector and chassis ground.
Measure resistance between CAN Low Terminal (# 11) of diagnostic connector and chassis ground.
Specification : ∞ Ω

Fig 1: Data Link Connector Diagram
Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: FATC Connector Terminals
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured value within specification?
YES
- Check HCU, PCM, MCU, BMS, A A F, FATC 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.