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:- Step no. Description Check Point if YES if NO 1 Check for LV battery voltage Check if the LV battery voltage is > 10V Go to step 2 Problem is with LV battery being discharged. Action: Charge LV battery to 12V 2 Remove the fuse of OBC Check if the fuse is of the correct rating No problem in OBC fuse Go to Step 3 Problem is in OBC fuse. Action: Replace the fuse with correct rating 3 Remove the fuse of OBC Check if the fuse is blown or not Problem is in OBC fuse. Action: Replace the fuse No problem in OBC fuse Go to Step 4 4 Remove the LV connector of OBC Check if there is continuity between 3in1 connector pin CAN H and CAN L Check for damage in 3in1 connector Action: Replace OBC No problem in OBC side LV connector Go to step 5. 5 Remove the LV connector of 3in1 Check if there is continuity between 3in1 side LV connector pin CAN H and CAN L Check for damage in connector pin/LV harness Action: Replace the pins/ terminals or replace the LV harness No problem in 3in1 side LV connector Go to step 6. 6 If there are any inline connectors, remove each of them Check if there is continuity between consecutive connector’s pin CAN H and CAN L Problem is in OBC to VCU wiring harness inline connectors No problem in wiring between the inline connectors
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