Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1 Date: 23/11/2022 Author: ERC Page 642 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 IPC in ECM in current state ? No (In history) 1. Check continuity between ECM CAN_H to IPC CAN_H and ECM CAN_L to IPC CAN_L in vehicle wiring side connector. 2. Check IPC ECU fuse blown. 3. Also, check IPC ECU is powered up properly. IPC Battery, IGN and GND connected properly with IPC ECU. Is continuity there? Repair the wiring harness if continuity is not there Clear DTC Stop Yes Yes No U0155-31: Lost of communication with Instrument Panel Cluster Module- Bus Signal/Message Failure Check continuity between ECM CAN_H to IPC CAN_H and ECM CAN_L to IPC CAN_L Check the resistance between ECM CANH and ECM CANL of ECM connector in vehicle wiring harness. (IPC connected on the vehicle) Is Resistance R = 120 ohm ? No Yes
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