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 for loose connection of LV wiring harness between VCU and 3 in 1 comboPDU LV connector Check for damage to LV wiring harness connections between VCU and 3 in 1 comboPDU LV connector Visually inspect 3 in 1 combo-PDU for damage Trouble Shooting: - 1. Remove the LV battery connections. Step No. Description Check point If Yes If No 1 Remove the LV connector of 3 in 1 combo-PDU Check continuity between supply pin and LSD pin of 3 in 1 comboPDU LV connector Pin 1 and 19 Problem is in the 3 in 1 combo-PDU. Action: Replace 3 in 1 combo-PDU and Go to step 1. Go to Step 2 2 Remove VCU side and 3 in 1 combo-PDU side LV connectors Check if there is continuity between supply pin and LSD pin of harness side connector C813 Pin 19 and C776B Pin 2 C813 Pin 18 and C776B Pin 86 (HSD) Problem in the wiring between 3 in 1 comboPDU connector and VCU connector. Go to Step 3 3 If there are any inline connectors, remove each of them Check if there is continuity between supply pin and LSD pin of consecutive connectors Problem in wiring between the inline connectors Action: change LV wiring harness connector and repeat step 3 Go to Step 4 4 Check if power supply pin short with DC charging contactor enable pin Check if there is continuity between VCU supply and LSD pin in harness side VCU connector Problem is in VCU side LV wiring harness connector Go to step 5
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