Component Inspection

■ Check Resistance of Ambient Temperature Sensor No. 4 (D) 

1. Ignition OFF.
2. Cool down the high voltage battery for more than 1 hour.
3. Remove the Safety Plug, check that terminal voltage is lower than 30V.
4. After disconnecting the BCM ECU temperature sensor and Cell sensing connectors, connect ohm meter between signal and ground terminal.
5. Measure resistance between ground and signal terminal of each the 5 temperature sensors at the BMS ECU connector.

   Specification: 

   Approx. 2 ~ 100 kOhm ± 1%

   Approx. 10kOhm ± 1% at 25°C (77°F)

   Approx. 2.23kOhm ± 1% at 70°C (158°F)

   WARNING: * Warning & Notice
   Hybrid Battery system uses around 270V voltage.
   It may cause death or damage due to electrical shock, if you do not follow below Instructions.

   • Follows instructions of workshop handbook.
   • Wear and use insulated gloves and tools.
   • IG "OFF", Disconnect ground cable of auxiliary battery and "OFF" the safety connector of the high voltage battery.
   • Check high voltage terminal on Power Relay Assembly is lower than 30V.
   • Be careful that it should not be short between terminals when measuring battery cell voltage. You may be injured due to spark, parts damage or electrical shock.
   • Metallic material cause high voltage short that may cause damage of life or vehicle. Therefore, get rid of all the metallic material before working. (Metallic Material: Watch, Ring, any metallic products etc.).
   • After disconnect W/H goes to BMS ECU from High voltage battery, be careful not to happen short between exposed terminal and terminal on high voltage connector.
   Fig 1: BMS ECU - Circuit Diagram (1 Of 2)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: BMS ECU - Circuit Diagram (2 Of 2)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 3: BMS ECU Connector End View (1 Of 2)

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 4: BMS ECU Connector End View (2 Of 2)

   Courtesy of HYUNDAI MOTOR AMERICA
6. Is the measured resistance within specification?

   YES 

   • This is a fault of BCS ECU itself or a intermittent history DTC which is not erased. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • If the DTC "P1BA1 High Voltage Battery FAN Fault" is set as history, repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Check the temperature sensing harness from the BMS ECU to the Hybrid high voltage battery. If problem is found, repair or replace as necessary. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • If its value is still abnormal after checking, repairing and replacing harness, it is necessary to replace the battery assembly due to excessive battery low temperature. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.