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. Check the VECU parameter value for HVIL related vehicle parameter as per below table VECU Parameter Name Expected Value Vehicle HVIL Sense PWM dutycycle 50 (+-5) % Vehicle HVIL Sense PWM Freq 100 Hz PDU HVIL Sense PWM dutycycle 50 (+-5) % PDU HVIL Sense Value Freq 100 Hz 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 dutycycle value (PDU HVIL Sense PWM dutycycle). If value is 0. Check the HVIL circuit for short to ground issue. 2. Check vehicle parameter dutycycle value (PDU HVIL Sense PWM dutycycle). 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 PDU HVIL Sense PWM dutycycle 0 Short to ground PDU HVIL Sense PWM dutycycle 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 PDU LV connector • Check for damage to LV wiring harness connections between VCU and PDU LV connector • Check if PDU cover is fitted properly • Check if all HV and LV connectors are connected to PDU • 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) • Visually inspect PDU for damage • Check if there is any backout of pins Trouble Shooting: - Step No. Description Check point If Yes If No
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