DCC undervoltage on VCB-side
• Reset DTC • Toggle ignition key to "key off" and await system reset then "key on" i.e. system wake up. • Read out DTC's again after Cranking the vehicle • If DTC remains active, check for open DCC VCB connectors at the Junction box side and DCC side • Check for blown VCB fuse for the DCC circuit and also a harness continuity check to detect open circuit • Then Crank the vehicle again and check the DTC • If DTC appears again then check for Undervoltage DTCs from battery pack and other VCB components • If undervoltage DTCs are appearing in many VCB components then check the battery pack
What you'll see
No driver-visible symptom recorded.
System reaction
• DCC disabled and enter error state below 300V • VOR, 24V not charging. DCC will be disabled and enter error state and the 24-volt system will drain the 24-volt batteries. • Amber warning lamp "24V batteries not charged" and "Hybrid System Fault" is shown in ICL
Diagnostic depth
The following DCC2 event is active: DC Bus.Low
• VCB circuit to DCC is open (Connectors open or cable discontinuity) • VCB fuse blown in X-box • DCC is enabled before Battery is connected to the VCB system • HV battery has wrong voltage level