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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 603 of 654
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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: Lost communication with Antilock Braking System Module-
ABS/ESP Bus signal/ Message Failure
Overview:
ISO Code
U0121
Customer Symptom
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)
ABS lamp will be ON
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 ABS/ ESP
are opened
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.