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: 199 of 202 U0423-81:- Invalid Data Received From IPC Overview: ISO Code U0423-81 Customer Symptom Reduced climate functionality and performance. Fault Effects (On Vehicle) Reduced climate functionality and performance. Lamp Status (If Any) 1) The value of signal "IPC_Invalid_Failure_Status" in supervision frame is changes from '0' to '1'. 2) Invalid Data Received from IPC DTC 0XC42381 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 [As mentioned in SSTP_1237]. 4) CAN communication is normal. 5) The value of signal "IPC_Invalid_Failure_Status" in supervision frame is '1' to '2'. 6) Invalid Data Received from IPC DTC 0XC42381 is in passive state in fault memory. 7) The HVAC outputs (motors and compressor request signal) is functional using actual data values of CAN message from IPC node. 8) CAN communication is normal. Fault Detection Condition Relevant functional DTCs present in ECM Normal Operating Condition IPC ECU sends correct data in normal condition. Probable Trouble Area Incorrect data received from IPC. Healing Condition After rectifying relevant functional failures in the IPC ECU
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