Vehicle Platform: All ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.12 Date: 02-06-2022 Author: TCM COC Page: 14 of 150 Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. U3000 - 08:- Control Module - Bus Signal / Message Failures Overview: ISO Code U3000 – 08 Control Module - Bus Signal / Message Failures Customer Symptom Telematics ECU features will not be working Fault Effects (On Vehicle) Remote , Vehicle security, Alerts and other telematics features will not be working Fault Detection Condition DTC is set in case of control module signal/message failure occurred Normal Operating Condition TCU communicates Properly with diagnostic tool and there is no signal/ message failure to the Partner ECU’s Probable Trouble Area CAN_H and CAN_L wires Internal TCU hardware errors Faulty TCU CAN high / CAN low pins shorted/Open CAN transceiver faulty Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify if any other functional DTCs present like Lost Communication between interfacing ECUs 3. Check the harness connector-Replace the harness in case of faulty connector 4. Check TCU connector in general, connect firmly in case of loose-Replace TCU in case of connector damage 5. Check pins 18(CAN_L) &19(CAN_H) for CAN failure- Replace TCU in case of connector damage 6. Verify the CAN terminal and correct the CAN termination and verify the CAN connection, retighten the TCU ground connections and retighten the battery negative. Read DTCs again, replace TCU in case of message failure after CAN correction in harness and termination side. 7. Replace TCU in case of internal hardware error
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