CAN Signal Circuit Inspection

Short Check (to ground)
1. IG "OFF".
2. Disconnect AHB connector.
3. 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 (High Terminal) Of AHB Harness Connector And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
4. 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
1. IG "OFF".
2. Disconnect the AHB, PCM(ECM) connector.
3. 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 And High Terminal Of AHB Harness Connector
  Courtesy of KIA MOTORS AMERICA, INC.
4. Is the measured value within specifications?
  YES
  - Check the resistances(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 resistances(122Ω) in cluster and open in CAN signal circuit of the AHB, repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.