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. P1235 - 13:- BMS_NegMainRlyConglut - circuit open Overview: ISO Code P1235 - 13 Customer Symptom Vehicle cannot be cranked Fault Effects (On Vehicle) No drive No charging Lamp Status (If Any) HV Fault on cluster Fault occurrence scenario Any operation Normal Operating Condition No fault Probable Trouble Area Negative contactor inside battery pack Healing Condition NA System Details: Negative contactor is located on high voltage side inside the battery pack and its ON/OFF status will be populated in diagnostics through DID parameter 3404. Negative contactor is supposed to work throughout the battery life. Preliminary Checks: 1) Ensure the vehicle is parked and not in charging 2) Ensure that the vehicle is in ignition ON condition Inspection Method: Connect the tool and communicate to the battery pack as instructed through APPENDIX-C Read DTC information of DTC ID – P1235 - 13 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 – P1235 – 13 for 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 – P1235 – 13 for 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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