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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