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 for proper terminal connection of 12V LV Battery 2. Check LV Battery voltage to be in range (9 V - 14V) 3. Check LV Supply Connection of HV battery for damage (connectors, terminals bending & rusting of pins) 4. Check for loose connection of LV wiring harness between HV battery and VCU 5. Check for damage to LV wiring harness connections between HV battery and VCU Trouble Shooting: - 1. Remove the LV battery connections. Step No. Description Check point If Yes If No 6. Remove the LV connector of HV battery Check continuity between supply pin and Key ON pin of HV battery Go to Step 2 Problem is in the HV battery. Action: Replace the HV battery and Go to step 1. 7. Remove VCU side and HV battery side LV connectors Check if there is continuity between these connectors C776A Pin 34 and C435A Pin S No problem in the wiring between the relay connector and VCU connector. Go to Step 3 Issue is between the relay to VCU wiring harness Action: replace wiring harness 8. If there are any inline connectors, remove each of them Check if there is continuity between consecutive connectors No problem in wiring between the inline connectors Go to Step 4 Issue is between the relay to VCU wiring harness inline wiring harness Action: replace wiring harness
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