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 combo-PDU LV connector Check for damage to LV wiring harness connections between VCU and 3 in 1 combo-PDU 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 23 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 23 and C776B Pin 85 C813 Pin 22 and C776B Pin 87 (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 PTC 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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