Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 487 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent Trouble Shooting: Start Read IVN DTCs in ECM Is MTO logged against ABS in ECM in current state ? No (In history) 1. Check continuity between ECM CAN_H to ABS CAN_H and ECM CAN_L to ABS CAN_L in vehicle wiring side connector. 2. Check ABS ECU fuses ( Battery fuse 25A, Ignition fuse 5A) blown. 3. Also, check ABS ECU is powered up properly. ABS Battery, IGN and GND connected properly with ABS ECU. Is continuity there? Repair the wiring harness. Clear DTC Stop Yes Yes No U0121 Loss of communication with Antilock Braking System- ABS/ESP Bus Signal/Message Failure Check continuity between ECM CAN_H to IPC CAN_H and ECM CAN_L to IPC CAN_L Check the resistance between ECM CANH and ECM CANL of ECM connector in vehicle wiring harness.(with IPC connected on the vehicle) Is Resistance R = 120 ohm ? No Yes
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