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: 186 of 202 U0155-08:- Lost communication with instrument Panel Cluster- IPC Message Time Out Failure Overview:- ISO Code U0155-08 Customer Symptom Reduced climate control functionality and performance. Fault Effects (On Vehicle) Reduced climate control functionality and performance Lamp Status (If Any) 1) The lost communication with IPC DTC 0x C15508 is in active state in fault memory. 2) The HVAC outputs (motors and compressor request signal) should be functional using default data values [As mentioned below: 1. Vehicle speed = 0 2. OAT IC Sig = 25DegC ] 3) The lost communication with IPC DTC 0xC15508 is in passive state in fault memory. 4) The HVAC outputs (motors and compressor request signal) should be respond to the panel request. 5) CAN communication should be normal. Fault Detection Condition Open circuit of the both CAN_H (connector pin no.6) and CAN_L(connector pin no.6), only CANH, only CANL Normal Operating Condition ECU communicates properly with IPC ECU. Probable Trouble Area CAN_H and CAN_L wires Healing Condition Reconnection of the CAN_H ( connector pin No.6) and CAN_L(connector pin no.5)with the main CAN bus
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