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. Step No. Description Check point If yes If No 1. Remove the VCU and V2X connectors. Connect all the inline connectors between VCU and switch and check for end-to-end continuity in V2X switch harness Check if there is a continuity between 1. VCU connector C776A Pin 30 and the V2X switch status (Connector C853- pin 3) 2. VCU connector C776A Pin 27 and the V2X switch Gnd (Connector C853- pin 4) Connection is okay Go to step 2 Check for harness damage and replace the harness 2. Check the short to ground at V2X switch Check if the resistance value is zero between V2X switch output and ground Problem is with V2X switch Action: Replace V2X switch Go to step 3 3. Check for the short at VECU pin side Check the voltage between K30 pin to A27 pin, if it is zero Short circuit to GND at VECU pin Problem with VECU pin Action: Replace VECU End DTC’s confirmation: - After rectification, ensure the following points by referring to VCU parameter list using TML diagnostic tool before handing over to customer. DID No Vehicle Parameter Name Expected Value when switch is not pressed 3545 V2X Switch Status analog input 1. Expected Value when switch is not pressed ~ 1.09- 1.3 V 2. Expected Value when switch is pressed ~ 0.066-0.115 V
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