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 DCDC converter to VCU wiring harness inline connectors Action: Change DCDC converter 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 U1329-08 is present? Go to step 2 Repair complete. 2 Remove the LV connector of DC-DC Converter C492 Check if there is continuity between DC-DC Converter signal connector C492 pin 1 (CAN H) and VCU Problem in DCDC Converter, replace it Check for damage in connector pin/LV harness
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