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. 1. Check if DTC U1322 – 08 lost communication with BMS is present. If yes then first resolve that DTC. 2. Remove the LV battery connections. Step No. Description Check point If Yes If No 1 Check for any loose connection between 3 in 1 combo-PDU to E drive Check if HV connectors are fitted properly, No terminal backout Problem is not with 3 in 1 combo-PDU to E drive cable fitment Go to step 2 Problem is due to 3 in 1 combo-PDU to E drive cable not connected/ loose connected Action: Connect 3 in 1 combo-PDU side and E drive side connectors again and make sure primary and secondary locks get engaged 2 Remove 3 in 1 comboPDU cover to check MCU fuse Check continuity between E drive fuse F6 :200A No problem in E drive fuse inside 3 in 1 combo-PDU Go to Step 3 HV fuse for E compressor inside 3 in 1 combo-PDU is blown Action: replace the E compressor fuse inside 3 in 1 combo-PDU / replace complete 3 in 1 combo-PDU 3 Remove 3 in 1 comboPDU side and E drive side HV connector of 3 in 1 combo-PDU to E drive cable Check if there is continuity between 3 in 1 combo-PDU and E drive pins (HC1010 and HC1011) No problem in the cable between 3 in 1 combo-PDU to E drive cable Issue is with 3 in 1 combo-PDU to E compressor cable
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