Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 511 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 U0073-00: Vehicle Communication Bus A- Bus off Overview: ISO Code U0073 Customer Symptom Check engine lamp will be ON . Fault Effects (On Vehicle) Vehicle will not start Lamp Status (If Any) Fault Detection Condition 1. Short circuit between CAN_H -CAN_L, CAN_H – GND, CAN_L-Vbatt, CAN_L-GND and/or CAN_H- Vbatt 2. Open circuit of CAN_H/ CAN_L/ both lines Normal Operating Condition ECM ECU communicates properly with other partner ECUs in the CAN network Probable Trouble Area CAN_H and CAN_L wires Healing Condition 1. Removal of the above mentioned shorts in the wiring harness or at ECU pin. 2. Reconnecting CAN_H/ CAN_L/ both lines to ECM ECU
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