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 VECU LV connectors Check for backout of A61, A74 pins Replace the VECU LV connectors Go to step 2 2. Remove the Eco/Sports switch LV connector Check for backout of Eco/Sports switch pins Replace the Eco/Sports switch connector Go to step 3 3. 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 4. Check if there is internal short in the switch Check for resistance (6830 +/- 5% ohm) between Eco/Sports pins If resistance is not the threshold value, Problem is with Eco/Sports switch Action: Replace the Eco/Sports 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 Eco/Sport selection switch after connecting all harness and Eco / sport switch NOTE: VECU Parameter- Eco & Sports mode switches analog input count value will be around 157 Short circuit at VECU pin Problem with VECU Action: Replace VECU End
RkJQdWJsaXNoZXIy MTIwNTUz