NEXON 2.0 EV DTC Troubleshooting Document for VCU Version: 1.0 draft Date: 31-Jan-2022 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. P302E - 12: - HV Battery Keep alive relay activation line - circuit short to battery Overview: ISO Code P302E - 12 Customer Symptom Vehicle is not operable. HV Critical Alert Tell-tale is seen blinking on cluster. Charging will be disabled. Fault Effects (On Vehicle) Vehicle will not be driveable. If vehicle is in running condition, it will go from Drive to Neutral. Air conditioning and charging will be disabled. Vehicle will not crank in the next Ignition cycle if this error is in confirmed state. Lamp Status (If Any) HV critical error indication blinking on Cluster Fault Detection Condition Shorting of HV Battery Keep alive relay activation line to battery Normal Operating Condition Vehicle is cranking Probable Trouble Area LV wiring Harness Healing Condition If DTC trigger condition is healed, DTC is present only in memory. However, cluster indication will be ON till one drive cycle of vehicle, until DTC is cleared using tester tool Component Details: HV Battery is the energy storage system of the electric vehicle and primary functions are to provide power during drive and accept power during charging. Preliminary Checks: 1. Check for proper terminal connection of 12V LV Battery 2. Check LV Battery voltage to be in range (9 V - 14V) HV Battery HV Battery Keep alive relay 12V LV Battery LV Signal from VCU
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