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. 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 1 Remove the LV connector of relay Check continuity between supply pin and LSD pin of relay LV connector Problem is in the relay. Action: Replace the relay and Go to step 1. Go to Step 2 2 Remove VCU side and relay side LV connectors Check if there is continuity between supply pin and LSD pin of harness side connector Problem in the wiring between the relay 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 relay 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 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 LSD pin of VCU K39 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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