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. Check the VECU parameter value for HVIL related vehicle parameter as per below table VECU Parameter Name Expected Value Vehicle HVIL Sense PWM duty cycle 50 (+-5) % Vehicle HVIL Sense PWM Freq 100 Hz PDU HVIL Sense PWM duty cycle 50 (+-5) % PDU HVIL Sense Value Freq 100 Hz Check if following DTC is present in vehicle. DTC Code DTC Description P301F - 13 PDU HVIL Sense PWM - circuit open If DTC is present in active state, refer to P301F -13 troubleshooting and then refer below steps. Depending on the type of fault (open circuit, short to battery or short to ground) following are the parameter values. 1. Check vehicle parameter for duty cycle value (Vehicle HVIL Sense PWM duty cycle). If value is 0. Check the HVIL circuit for short to ground issue. 2. Check vehicle parameter duty cycle value (Vehicle HVIL Sense PWM duty cycle). If value is 100. Check the HVIL circuit for short to battery or open circuit issue. VECU Parameter Name Parameter Value Issue in HVIL circuit Vehicle HVIL Sense PWM duty cycle 0 Short to ground Vehicle HVIL Sense PWM duty cycle 100 Short to battery/ open circuit Check these VECU parameter value to diagnose the root cause of fault on vehicle Check for loose connection of LV wiring harness between VCU and Battery LV connector Check for damage to LV wiring harness connections between VCU and Battery LV connector Check for LV loose connections of HV Battery, Edrive and Air Compressor Check if there is galvanic corrosion observed on HV connectors (especially High Voltage battery HV connector). Galvanic corrosion means green colour substance deposition is seen on inner contact surface of HV connectors. (It is not like normal corrosion observed as reddish brown on metal) Check if all HV connectors are connected to HV battery Visually inspect HV battery for damage Check if all HV connectors are connected to E-drive Visually inspect E-drive for damage Check if all HV connectors are connected to Air compressor Visually inspect Air compressor for damage
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