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. 1. Remove the VECU LV connectors, Eco/Sports switch LV connector. Connect all the inline connectors between VCU and switch and check for end-to-end continuity in Eco/Sports switch harness Check if there is a continuity between 1. VCU connector C776B Pin 61 and the Eco/Sports switch status (Connector C550- pin 4) 2. VCU connector C776B Pin 74 and the Eco/Sports switch GND (Connector C550 - pin 3) Connection is okay Go to step 4 Check for harness damage 2. Check if there is internal short in the switch Check for resistance zero between Eco/Sports pins NOTE: When no switch is pressed, resistance value of switch should be (6830 +/- 5% ohm) If resistance is not the threshold value, Problem is with Eco/Sports switch Action: Replace the Eco/Sports switch Go to step5 3. Check if there is short to GND inside VECU Check the continuity between K61 pin to K74 pin Short circuit at VECU pin Problem with VECU Action: Replace VECU End DTC’s confirmation: - After rectification, ensure the following points by referring to VECU parameter list using TML diagnostic tool before handing over to customer. DID No Vehicle Parameter Name Expected Value when switch is not pressed 34DF Eco & Sports mode switches analog input count value 157 +/- 5 1. Vehicle should be in Ignition ON Mode 2. change the mode using Eco & Sports switch and check if it is working. Press Eco/Sports and check the following DID value, if it is in the valid expected range.
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