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. MCU (Motor Control Unit) contactor or E drive contactor is present in Power Distribution Unit and is used to enable and disable HV voltage to E-drive as per command given by VCU. Preliminary Checks: 1. Check for loose connection of LV wiring harness between VCU and 3 in 1 combo-PDU LV connector 2. Check for damage to LV wiring harness connections between VCU and 3 in 1 combo-PDU LV connector 3. Visually inspect 3 in 1 combo-PDU for damage Trouble Shooting: - Step No. Description Check point If Yes If No 1. Check other DTCs related to MCU contactor Check if DTC P3030-11 is there Go through troubleshooting of DTC P3030-11 Go to step 2 2 Remove MCU connector: HC1010, AC Compressor connector HC1006 and LV connector of 3 in 1 combo-PDU NOTE: Ensure High Voltage is not Present on HV line before any diagnosis Check continuity on 3 in 1 combo-PDU side connector as below: Continuity between Pin2 of HC1010 and Pin 1 of HC1006 Problem is in the 3 in 1 comboPDU. Action: Replace the 3 in 1 combo-PDU and Go to step 1. Wrong weld detection in software DTC’s confirmation: - After rectification, send Clear the DTC command by using TML diagnostic tool. Send ‘Read DTC’ command and verify if the DTC is still present in confirmed/memorized state. If DTC still exist, send ‘write parameter’ for VECU as per below DID No Vehicle Parameter Name Write Value 348C Powertrain Config State 2 0 Read the parameter value and confirm that the value is properly written in VCU.
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