1153 / 5157
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: 1149 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.
U0001-88:- Vehicle Communication Bus A- Bus Off
Overview:
ISO Code
U0001-88
Customer Symptom
All warning lamps will be ON,
Vehicle will not Start.
Fault Effects (On Vehicle)
CAN communication in vehicle will be OFF.
Lamp Status (If Any)
CE Lamp ON after 1 drive cycle
Fault Detection Condition
1. Short circuit between
CAN_H(C1, 32) - CAN_L(C1,44);
CAN_H(C1, 32) - GND(C1, 53 and 54);
CAN_L(C1, 44) – Vbatt(C1, 55 and 56);
CAN_L(C1, 44) - GND GND(C1, 53 and54)
and/or
CAN_H (C1, 32) – Vbatt (C1, 55 and 56).
1. Open circuit of CAN_H/ CAN_L/ both lines
Normal Operating Condition
ECM communicates properly with TML diagnostic Tool.
Probable Trouble Area
CAN_H and CAN_L wires
Healing Condition
1. Removal of short circuit conditions mentioned above
in the wiring harness or at ECU pin.
2. Reconnecting CAN_H/ CAN_L/ both lines
Preliminary checks:
1.
Check ECM is communicating with TML diagnostic DTC or not.
2.
If not, check for short conditions between CAN_H-CAN_L, CAN_H-GND, CAN_L-GND, CAN_H-Vbatt and
CAN_L-GND at ECM vehicle side wiring harness (pin details are provided with schematic in the document).
There should not be any short Circuit conditions.
3.
There should be continuity between vehicle side wiring harness with following pins.
IPC CAN_H (pin. 6) to ECM CAN_H(C1, 32) and IPC CAN_L (pin. 5) to ECM CAN_L(C1, 44)
Continuity should be there.
4.
Read IVN DTCs in ECM after IGN ON condition with TML diagnostic tool.