Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 651 of 834 Copyright by TATA MOTORS Ltd. This document must not be used in any w ay, such as copying and redistributing to third parties, w ithout our consent Trouble Shooting: Start Read IVN DTCs in ECM Is Bus Off in ECM in current state? No (In history) 1.Remove ECM from vehicle wiring harness. 2.Measure the resistance between following lines in ECM vehicle side wiring harness 1. CANH &CANL, 2. CANH & Ground , 3. CANL & Battery, 4. CANH &Battery and 5. CANL &Ground Is resistance R < 10ohm ? Check the resistance between CANH and CANL of ECM connector in vehicle wiring harness.(with IPC connected on the vehicle) Clear DTC Stop There is short circuit failure in between respective two lines Do necessary repair in the harness Yes Yes No Is resistance ≠ 120 ohm ? Yes Check the continuity between 1. ECM CAN_H & IPC CAN_H 2. ECM CAN_L & IPC CAN_L In vehicle side connectors Do necessary repair in the harness No (120 ohm) U0073-00: Vehicle Communication Bus A-Bus off
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