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. 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 3 in 1 combo-PDU connector’s input pin 1 and 17 Go to Step 2 Problem is in the 3 in 1 combo-PDU. Action: Replace the 3 in 1 combo-PDU and Go to step 1. 2. Remove VCU side and 3 in 1 combo-PDU side LV connectors Check if there is continuity between these connectors C813 Pin 17 and C776B Pin 25 C813 Pin 16 and C776B Pin 66 (HSD) No problem in the wiring between the 3 in 1 combo-PDU connector and VCU connector. Go to Step 3 Issue is between the 3 in 1 comboPDU to VCU wiring harness Action: replace wiring harness 3. 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 3 in 1 comboPDU to VCU wiring harness inline wiring harness Action: replace wiring harness 4. Remove the VCU connector. Check if there is a continuity between A25 Pin No. of VCU and the ground (Chassis). Problem in VCU connector or VCU.
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