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. CAN network as per the details given in LV schematic. 3. Remove the LV battery connections. 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 MCU Check if the fuse is of the correct rating No problem in MCU fuse Go to Step 3 Problem is in MCU fuse. Action: Replace the fuse with correct rating 3 Remove the fuse of MCU Check if the fuse is blown or not Problem is in MCU fuse. Action: Replace the fuse No problem in MCU fuse Go to Step 4 4 Remove the LV connector of MCU Check if there is continuity between MCU connector pin CAN H and CAN L Check for damage in MCU connector Action: Replace BMS No problem in MCU side LV connector Go to step 5. 5 Remove the LV connector of MCU Check if there is continuity between MCU 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 MCU 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 MCU to VCU wiring harness inline connectors No problem in wiring between the inline connectors Go to Step 7
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