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 Check for backout of K11, K62 pins Replace the VECU LV connectors Go to step 2 2. Remove the Regen switch LV connector Check for backout of Regen switch pins Replace the Regen switch connector Go to step 3 3. Connect all the inline connectors between VCU and switch and check for end-to-end continuity in Regen switch harness Check if there is a continuity between 1. VCU connector C776A Pin 11 and the Regen switch status (Connector C812- pin 4) 2. VCU connector C776A Pin 62 and the Regen switch GND (Connector C812- pin 3) Connection is okay Go to step 4 Check for harness damage 4. Check if there is internal resistance of the switch Check for resistance (6830 +/- 5% ohm) between Regen switch pins If resistance is not within the threshold value (6830 +/- 5% ohm), Problem is with Regen switch Action: Replace the Regen switch Go to step5 5. Reconnect all the VECU LV connectors and switch connectors. Reconnect the LV battery, switch ON Ignition Check the VECU parameter for Regen selection switch after connecting all harness and regen switch NOTE: VECU Parameter- Regen control switch analog input count value will be around 157 +/- 5 when all connections are okay. Short circuit at VECU pin Problem with VECU Action: Replace VECU End
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