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. 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 1 Remove the LV connector of HV battery Check continuity between supply pin and key on signal pin of HV battery LV connector Problem is in the HV battery. Action: Replace HV battery and Go to step 1. Go to Step 2 2 Remove VCU side and HV battery side LV connectors Check if there is continuity between supply pin and key on signal pin of harness side connector Problem in the wiring between HV battery 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 key on signal 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 HV battery key ON enable pin Check if there is continuity between VCU supply and key on signal pin in harness side VCU connector Problem is in VCU side LV wiring harness connector Action: change LV wiring harness connector and repeat step 4 Go to step 5 5 Remove the VCU connector. Check if there is a continuity between K34 Pin No. of VCU and the VCU supply pin Problem in VCU connector or VCU. (Change VCU connector or VCU) TBD Action: Go to step 5
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