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. 2. Check for the LV wiring harness connection between VCU and compressor ECU on Vehicle 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 compressor Check if the fuse is of the correct rating No problem in compressor fuse Go to Step 3 Problem is in compressor fuse. Action: Replace the fuse with correct rating 3 Remove the fuse of compressor Check if the fuse is blown or not Problem is in compressor fuse. Action: Replace the fuse No problem in compressor fuse Go to Step 4 4 Remove the LV connector of compressor Check if there is continuity between BMS connector pin CAN H and CAN L Check for damage in compressor connector Action: Replace compressor No problem in compressor side LV connector Go to step 5. 5 Remove the LV connector of compressor Check if there is continuity between compressor 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 compressor 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 Problem is in compressor to VCU wiring No problem in wiring between the inline connectors
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