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. Action: Change OBC to VCU inline wiring harness Go to Step 7 7 Remove the LV connector of VECU Check if there is continuity between VECU side connector pin CAN H and CAN L Check for damage in VECU connector Action: Replace VECU side connector No problem in VECU side LV connector Go to step 8. 8 Remove the LV connector of VECU Check if there is continuity between pin CAN H and CAN L of VECU Check for damage in VECU pin Action: Replace VECU Step no. Description Check Point if YES if NO 1 Remove the 12V LV battery negative terminal. After a minute connect the 12V LV battery negative terminal & "Ignition Switch" to ON position. Crank and wait for 2 minutes. Check for the fault code. Fault code U140088 is present? Go to step 2 Repair complete. 2 Remove the LV connector of 3in1 Check if there is continuity between 3in1 signal connector pin 5 (CAN H) and VCU pin 101. OBC signal connector pin 6 (CAN L) and VCU pin 102. Problem in 3in1 OBC, replace it Check for damage in connector pin/LV harness Action: Replace the pins/ terminals or replace the LV harness and go to step 1 DTC’s confirmation:- After rectification, ensure the following points by referring OBC parameters using TML diagnostic tool before handing over to customer.
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