W/Harness Inspection

HEV Battery System
U0001 High Speed CAN Communication Bus off (C-CAN) - Inspection/Repair:_:W/Harness Inspection

Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found ?






C-CAN Communication Inspection

Check resistance of C-CAN communication Line
1. IG KEY OFF.
2. Disconnect Aux. battery (-) cable.
3. Wait for 5 minutes after turning main switch off.
4. Disconnect BMS ECU connector.
5. Check resistance between C-CAN LOW signal and C-CAN HIGH signal terminal of disconnected BMS ECU connector.

Specification :Specification : Approx. 120 Ohms

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 manual.
▪ Wear and use insulated glooves 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.
▪ Metalic material cause high voltage short that may cause damage of life or vehicle. Therefore, get rid of all the metalic material before working. (Metalic Material : Watch, Ring, any metalic 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.








6. s the measured value within specification ?





Check signal waveform of C-CAN LOW sigal circuit and C-CAN HIGH signal
1. IG KEY OFF.
2. Connect BMS ECU connector.
3. Maintain EV mode at Idle or Accelleration after starting.
4. Measure signal waveform of C-CAN LOW signal and C-CAN High signal of BMS ECU connector.

Specification :Signal waveform is as same as standard signal waveform








5. Is the measured value within specification ?