Kanger2.0: DTC Troubleshooting Document for BMS Version: 3.0 Date: 14th Jan 2022 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. U1301 - 87:- BMS lost communication with VCU third level alarm - missing message Overview: ISO Code U1301 - 87 Customer Symptom Vehicle will not crank Fault Effects (On Vehicle) NA Lamp Status (If Any) HV Fault on cluster Fault occurrence scenario(In the order of probability) Any operation Normal Operating Condition No fault Probable Trouble Area CAN communication network Healing Condition Re-igniting the vehcle System Details: BMS and VCU communicate with each other via CAN messages . The CAN wires are routed through LV connector of traction Battery. Preliminary Checks: 1) Ensure the vehicle is parked, not in charging and that the vehicle is in ignition ON condition 2) Check the LV battery voltage. It should be atleast greater than 10V. 3) If LV battery is discharged fully below 10V, ensure to charge back the LV battery to >12V as per respective standard procedure and re-install on vehicle. Inspection Method: Connect the tool and communicate to the battery pack as instructed through APPENDIX-C Read DTC information of DTC ID – U1301 - 87 Rectification Action: 1) If DTC is appearing in real time, clear DTC information through service tool 2) If DTC is not appearing in real-time but has only occurred before, store the snapshot data. store the snapshot data. 3) Clear the DTC information on the respective DTC ID. DTC’s confirmation: After clearing, ensure the following points by referring to BMS DTC list. 1) Read DTC ID – U1301 - 87for the existence of DTC information. 2) If DTC still exists, reflash the battery pack using the service tool with the latest release SW available in PLM database. 3) Read DTC ID – U1301 - 87for the existence of DTC information post flashing. 4) If DTC still exists, the HV battery pack component has to be replaced as instructed by the respective ECU replacement guide Component Location & Image;Connector Location; Connector View & Information: - APPENDIX-A
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