Q5/X451 FATC DTC Troubleshooting Data Version: 1.0 Date: 16-Oct-2018 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Author: ERC Page: 196 of 202 U0401-81:- Invalid Data Received From ECM Overview: ISO Code U0401-81 Customer Symptom Reduced climate functionality and performance. Cooling does not happen as per user set temperature request. Fault Effects (On Vehicle) 1) Accurate heating/Cooling cannot be achieved 2) Cold start compensation for Blower and Air distribution will not be possible Lamp Status (If Any) 1) The value of signal "EMS_Invalid_Failure_Status" in supervision frame is changes from '0' to '1'. 2) Invalid Data Received from ECM/PCM "A" DTC is in active state in fault memory. 3) The HVAC outputs (motors and compressor request signal) is functional using default data values where CAN data not available 4) CAN communication is normal. 5) The value of signal "EMS_Invalid_Failure_Status" in supervision frame is '1' to '2'. 6) Invalid Data Received from ECM/PCM "A" DTC is in passive state in fault memory. 7) The HVAC outputs (motors and compressor request signal) is functional using acutal data values of CAN message from ECM node. 8) CAN communication is normal. Fault Detection Condition Relevant functional DTCs present in ECM Normal Operating Condition ECM ECU sends correct data in normal condition. Probable Trouble Area Incorrect data received from ECM. Healing Condition After rectifying relevant functional failures in the ECM ECU
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