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: 180 of 202 U0100-08:- Lost communication with ECM- Message Timeout Failure Overview: ISO Code U0100-08 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 ECM/PCM "A" DTC 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 in SSTP_1237]. 3) CAN communication should be normal but ECM/PCM "A" node message should disappear. 4) The lost communication with ECM/PCM "A" DTC is in passive state in fault memory. 5) The HVAC outputs (motors and compressor request signal) should be respond to the panel request. 6) CAN communication should be normal. Fault Detection Condition 1. ECM connector is not connected properly or disconnected from its location 2. CAN Stub wire from ECM connector side is disconnected. 3. ECM ECU is not powered up. Normal Operating Condition ECM ECU communicates properly TML diagnostic Tool. Probable Trouble Area Disconnection of the ECM connector Healing Condition To fix the ECM connector correctly and Fix the wiring harness issues from ECM side.
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