CAN Communication Line Inspection

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

■ Check Short to Ground in CAN Communication Line.

Ignition OFF
Disconnect all related module connectors.
Ignition 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: approx. 0V

■ Check Short to Ground in CAN Communication Line

Ignition OFF.
Disconnect all related module connectors.
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: Measuring Resistance Between CAN Low Terminal Of Diagnostic Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA

Fig 2: CAN Connector Terminal
Courtesy of HYUNDAI MOTOR AMERICA
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.