Q501 4 Cylinder MT Application DTC Troubleshooting Data Version: 0.1 Date: 21-Sep-2018 Prepared By: Mithi Prasad, Sarang Kulkarni, Manish Gupta Checked By: Yogesh Jadhav Approved By: Satish Kumar P Page: 76 of 1052 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: Lost Communication With Anti-Lock Brake System (ABS) Control Module: ABS/ESP Node Tout Faulty Overview: DTC Description (User Friendly) Lost Communication With Anti-Lock Brake System (ABS) Control Module: ABS/ESP Node Tout Faulty ECU Pin Number K013 – CAN_H K014 – CAN_L A075 – Ignition K001, K003, K005 – Supply voltage battery K002, K004, K006 - Ground voltage battery Customer Symptom MIL OFF, CEL ON. ABS will not work, Drag torque control will not happened. Fault Effects (On Vehicle) ABS will not work, Drag torque control will not happened. Lamp Status (If Any) CEL ON. CEL Turns Off as and when fault condition is not present / healed. Fault Detection Condition (Root cause) 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 ABS/ ESP are opened. 5. Any of the selected frames from BRK node is timed out. Normal Operating Condition ECM ECU communicates properly with ABS ECU. Probable Trouble Area 1. Disconnection of the ABS connector. 2. CAN_H and CAN_L lines at ABS 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 ABS are connected properly to the ABS connector. Component Details: An anti-lock braking system (ABS) is a safety anti-skid braking system. ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface. Preliminary Checks: 1. Check whether the customer voice / view about the issue is matching with the fault effects mentioned in above Table. If yes, go ahead with next steps. If not, check for other DTC’s presence. 2. Check whether other customers report similar complaints earlier. If yes, perform the preliminary checks with respect to earlier issue closure. 3. Check for Damage in EMS ECU connector / ABS Connector. 4. Check for any back out of pins at EMS ECU connector / ABS Connector. 5. Check for any damage of pins at EMS ECU connector / ABS Connector.
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