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. U132A - 08: - Lost Communication with On-Board Charger (OBC) module - Bus Signal / Message Failures Overview: ISO Code (If applicable) U132A-08 Customer Symptom Vehicle would not go into charging mode for slow charging. Fault Effect (On Vehicle) The vehicle is drivable and slow charging is not possible on vehicle. Gun remains in locked position. Lamp Status (If Any) Charging lamp indication cluster is On when charging gun is connected DTC Detection Condition 3incombo - OBC CAN message are not received to VECU Normal Operating Condition 3in1combo - OBC communicates to VECU via CAN protocol and is responsible for slow charging function Probable Trouble Area LV wiring Harness 3in1 combo - OBC signal connector/terminals 3in1 combo - OBC internal fault Healing Condition Disconnect the gun and connect back after VCU sleeps Component Details: The 3in1 combo - On-Board Charger (OBC) takes AC input and converts it to direct current to charge a HV battery. The LV supply of OBC is from 12V battery. It requires AC HV supply voltage of 230V, 50Hz to charge the HV battery. Pre-Check Points: KL 30 12V LV supply to 3in1 combo KL 31 LV/Chassis ground to 3in1 combo a) Check for proper terminal connection of 12V LV Battery b) Check for 3in1 CAN pins in LV connector ( CAN H – pin 5 CAN L – pin 6 ) for any damage or backout. c) Check for equivalent resistance between CAN H & CAN L to be 60Ω d) Check for voltage between CAN H & CAN L to be 2.5V
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