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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 1157 of 1203
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.
Trouble Shooting:-
Start
Read IVN DTCs in ECM
Is MTO logged against
ABS in current state?
No (In history)
Check continuity between
ECM CAN_H (pin no. 132) to ABS CAN_H(pin no. 26)
and
ECM CAN_L(pin no. 144) to ABS CAN_L(pin no. 14)
in vehicle wiring side connector.
Is continuity
there?
Repair the wiring harness
Clear DTC
Stop
Check Ignition (pin 28), Battery (pin no. 1, 25) and
Ground (pin no. 13,38) of ABS is properly
connected.
Also check fuse blown (Battery fuse 25 Amp and
Ignition fuse 5Amp)
Do necessary repair in the harness
Yes
Yes
No
U0121-31 Loss of communication with Antilock Braking
System Control Module- Bus Signals/ Message Failures