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. 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 Action: Change OBC to VCU inline wiring harness No problem in wiring between the inline connectors 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 OBC Check if there is continuity between OBC signal connector pin 4A (CAN H) and VCU pin 101. OBC signal connector pin 4B (CAN L) and VCU pin 102. Problem in 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:-
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