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. P1220 - 22:- BMS temperature difference high first level alarm - signal amplitude > maximum Overview: ISO Code P1220 - 22 Customer Symptom NA Fault Effects (On Vehicle) None Lamp Status (If Any) Tortoise Lamp with Limited perfromance Fault occurrence scenario(In the order of probability) NA Normal Operating Condition NA Probable Trouble Area Battery Cooling system Healing Condition Running battery coolant pump at full capacity System Details: Battery cell temperature is detected by the BMS internally and the value of the maximum and minimum temperatures is populated in diagnostics through DID parameters 3409 & 340B. 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 – P1220 - 22 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. 3) Vehicle has to be kept isolated for a minimum of 6 hrs without operating to equalize the temperature differences inside battery pack 4) Temperature difference has to be verified after isolation using DID information mentioned above. 5) 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 – P1220 – 22 for the existence of DTC information. 2) Read DIDs 3409 & 340B values using diagnostics . Difference between the two values will give the temperature difference inside the battery pack. 3) If temperature difference has not reduced to less than 6oC after isolation, pack has to be replaced. 4) If temperature difference has reduced to less than 6oC after isolation, proceed to the next step. 5) If DTC still exists, reflash the battery pack using the service tool with the latest release SW available in PLM database. 6) Read DTC ID – P1220– 22 for the existence of DTC information post flashing. 7) 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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