CAN Signal Circuit Inspection

WARNING: This page is about a different car, the 2015 Hyundai Sonata. However, it is still accessible from the selected car via links, so may be relevant.

■ Short Check (to Ground)

IG "OFF".
Disconnect AHB connector.
Measure resistance between CAN LOW Terminal (CAN HIGH Terminal) of the AHB harness connector and chassis ground.
Specification: ∞ Ω

Fig 1: Measuring Resistance Between CAN Low Terminal (CAN High Terminal) Of AHB Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured value within specifications?
YES
- Go to next procedure.
NO
- If abnormal resistance is detected in CAN HIGH circuit, Repair short to ground in CAN HIGH circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- If abnormal resistance is detected in CAN LOW circuit, Repair short to ground in CAN LOW circuit and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ CAN BUS Resistance Check

IG "OFF".
Disconnect the AHB, PCM (ECM) connector.
Measure resistance between CAN LOW terminal and CAN HIGH terminal of the AHB harness connector.
Specification: Approx. 120Ω

Fig 2: Measuring Resistance Between CAN Low Terminal And CAN High Terminal Of AHB Harness Connector
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured value within specifications?
YES
- Check the resistance (122Ω) in PCM (ECM), repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- If above check is OK, go to "COMPONENT INSPECTION " procedure.
NO
- In case of the resistance "approx. 1Ω": Repair mutual short in CAN signal circuit of the AHB and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- In case of the resistance "∞ Ω": Check the resistance (122Ω) in cluster and open in CAN signal circuit of the AHB, repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.