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. SNo Vehicle Parameter Name Expected Value 1 DC-DC System Status Check if it is in Fault 2 HV Busbar voltage {230-380V} 3 HV DC-DC Converter input voltage {230 – 380v} 2. Check if any of the following conditions are satisfied a. Compressor CAN message timeout happened - check for compressor DTCs in confirmed state Check compressor LV Connectors for pin back out or connector damage. b. Check if difference of Compressor HV voltage and battery voltage is greater than permissible threshold value SNo Vehicle Parameter Name Expected Value 1 HV Busbar voltage {230-380V} 2 Comp_HV_DC Bus Voltage {230-380V} Trouble Shooting: - 1a. Check if LV Connector of DC-DC Converter is connected properly. Also check for pin backout or connector damage of LV Connectors. 2a. Check if LV Connector of Compressor is connected properly. Also check for pin backout or connector damage of LV Connectors. 2b. Difference of Compressor HV voltage and HV Battery voltage Initial turn off to be followed are following 1. Turn off Ignition off 2. Remove LV battery terminal 3. Remove MSD of HV battery Step No. Description Check point If Yes If No
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