NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. P304B - 09: - HV Supply not available at MCU - Component Failures Overview: ISO Code P304B - 09 Customer Symptom HV Critical Alert Tell-tale is seen blinking on cluster. Fault Effects (On Vehicle) Vehicle will not be drivable. If vehicle is in running condition, it will go from Drive to Neutral. Air conditioning will be disabled. Vehicle may not crank in the next Ignition cycle, if this error is in confirmed state Lamp Status (If Any) HV critical lamp is Blinking on the cluster Fault Detection Condition Vehicle cannot be drivable Normal Operating Condition Vehicle can be drivable Probable Trouble Area HV cables 3 in 1 combo-PDU HV connector Inside 3 in 1 combo-PDU E drive HV connector Healing Condition NA Component Details: HV fuse is blown to interrupt the High voltage circuit current in case of an overcurrent condition. Preliminary Checks: Check for loose connection of HV cables between 3 in 1 combo-PDU to E Drive Check for damage to HV cables between 3 in 1 combo-PDU to E drive Visually inspect 3 in 1 combo-PDU for damage Trouble Shooting: -
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