TATA BSVI Gasoline_Bifuel Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 2.6 Date: 5-10-2023 Prepared By: Pradip Shimpi Checked By: Yeshwant Jadhav Approved By: Sanjeev M. Document Part No: 2921 02 xxx xxxx Page: 1047 of 1720 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. U0121-31: Loss of communication with Antilock Braking System-Message Timeout Failure Overview: ISO Code U0121-31 Customer Symptom ABS Drag Torque control functionality will not work. Fault Effects (On Vehicle) ABS Drag Torque control functionality will not work Lamp Status (If Any) Nil Fault Detection Condition 1. ABS/ ESP Control Module connector is not connected properly or disconnected from its location. 2. CAN Stub wire from ABS/ ESP Control Module connector side is disconnected. 3. ABS/ ESP Control Module is not powered up. Normal Operating Condition ABS/ ESP Control Module communicate properly with TML diagnostic Tool. Probable Trouble Area Disconnection of the ABS/ ESP connector Healing Condition After 1 driing cycle(To fix the ABS/ ESP Control Module correctly and Fix the wiring harness issues from ABS/ ESP Control Module side).
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