TIAGO AMT Gasoline DTC Troubleshooting Guide Version: 2.0 Date: 06-06-2016 Author: Sathi/Anupama Page: 366 of 424 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. 128. U0121 -08:- Lost communication with Antilock Braking System Module- ABS/ESP Bus signal/ Message Failure Overview: ISO Code U0121-08 Customer Symptom TBD Fault Effects (On Vehicle) TBD Lamp Status (If Any) TBD Fault Detection Condition 1. ABS connector is not connected properly or disconnected from its location. 2. ABS/ ESP is not powered up 3. ABS/ ESP connector is not connected/ disconnected from vehicle side wiring harness. 4. CAN_H, CAN_L or/ and both lines of TCM are opened 5. Wrong data length (less than expected data) from ABS ECU Normal Operating Condition TCM ECU communicates properly with ABS ECU. Probable Trouble Area 1. Disconnection of the ABS connector 2. CAN_H and CAN_L lines at TCM connector end Healing Condition 1. To fix the ABS connector correctly and Fix the wiring harness issues from ABS side. 2. CAN_H, CAN_L or/ and both lines of TCM are connected properly to the TCM connector.
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