NEXON 2.0 EV DTC Troubleshooting Document for VCU Version: 1.0 draft Date: 31-Jan-2022 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. Check there is no BMS DTCS U1301-87 or U1302-87 read by the tool. 2. Check if there is no HV battery Fuse related VECU DTCs-P302E. 3. Check for the LV wiring harness connection between VCU and BMS on Powertrain CAN network as per the details given in LV schematic. 4. 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 BMS Check if the fuse is of the correct rating No problem in BMS fuse Go to Step 3 Problem is in BMS fuse. Action: Replace the fuse with correct rating 3 Remove the fuse of BMS Check if the fuse is blown or not Problem is in BMS fuse. Action: Replace the fuse No problem in BMS fuse Go to Step 4 4 Remove the LV connector of BMS Check if there is continuity between BMS connector pin CAN H and CAN L Check for damage in BMS connector Action: Replace BMS No problem in BMS side LV connector Go to step 5. 5 Remove the LV connector of BMS Check if there is continuity between BMS 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 BMS side LV connector Go to step 6.
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