Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 515 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 U0037-86: Vehicle Communication Bus A- Error Passive Overview: ISO Code U1009 Customer Symptom Check engine lamp will be ON Fault Effects (On Vehicle) Vehicle may not start Lamp Status (If Any) Check engine lamp will be ON , Fault Detection Condition 1. Open circuit of CAN_H/ CAN_L/ both lines of ECM ECU 2. Short circuit between CAN_H - Vbatt, CAN_L – GND of ECM ECU 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
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