C-CAN Communication Inspection
WARNING: This page is about a different variant/trim than selected.
■ Check Resistance of C-CAN Communication Line
- IG KEY OFF.
- Disconnect Aux. Battery (-) cable.
- Wait for 5 minutes after turning main switch OFF.
- Disconnect BMS ECU connector.
- Check resistance between C-CAN LOW signal and C-CAN HIGH signal terminal of disconnected BMS ECU connector.
Specification: Specification: Approx. 120 Ω
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.
- Is the measured value within specification?
YES
- Perform checking signal waveform of "C-CAN Low and C-CAN HIGH.
NO
- The resistance value is around 1.0 Ω: Repair as necessary after finding short between C-CAN HIGH and C-CAN LOW. And then, go to "VERIFICATION OF VEHICLE REPAIR " Procedure.
- In case of infinity Ω: Repair open or short circuit of C-CAN. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
■ Check Signal Waveform of C-CAN LOW Signal Circuit and C-CAN HIGH Signal
- IG KEY OFF.
- Connect BMS ECU connector.
- Maintain EV mode at Idle or Acceleration after starting.
- Measure signal waveform of C-CAN LOW signal and C-CAN High signal of MCU connector.
Specification: Signal waveform is as same as standard signal waveform
Courtesy of HYUNDAI MOTOR AMERICA
- Is the measured value within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Check battery, ground or short each other in C-CAN LOW and C-CAN High of MCU Repair as necessary. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.