Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 622 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 MTO logged against BCM in ECM in current state ? No (In history) 1. Check continuity between ECM CAN_H to BCM CAN_H and ECM CAN_L to BCM CAN_L in vehicle wiring side connector. 2. Check if BCM ECU fuses are blown. 3. Also, check BCM ECU is powered up properly. BCM Battery, IGN and GND connected properly with BCM ECU. Is continuity there? Repair the wiring harness if continuity is not there Clear DTC Stop Yes Yes No U0140-31 Lost of communication with Body Control Module- Bus Signal/Message Failure Check the continuity between ECM CAN_L & IPC CAN_L And ECM CAN_H & IPC CAN_H In vehicle side connectors Check the resistance between ECM CANH and ECM CANL of ECM connector in vehicle wiring harness. (with IPC connected on the vehicle) Is Resistance R = 120 ohm ? No Yes
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