Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 516 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 Trouble Shooting: Start Read IVN DTCs in ECM Is Open Ckt DTC 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. CAN_H &CAN_L, 2. CAN_H & 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) U1009 Vehicle Communication Bus A- Open Circuit
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