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:

Fig 1: Measuring Resistance Between Diagnostic Connectors
Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: CAN Connector Terminals
Courtesy of HYUNDAI MOTOR AMERICA

Fig 3: Data Link 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.