NEXON NEW MCE-2 DCT BS VI DTC Troubleshooting Guide Version: 1.0 Date: 16-06-2023 Author: Akash/Rahul Page:542 of 645 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. 154. U0100-00 CAN communication with EMS failed Overview: ISO Code U0100-00 Customer Symptom • CAN buss off limphome active • Transmission fault lamp ON • Gearshift & Creep function is disabled • Vehicle cranking is disabled Fault Effects (On Vehicle) • CAN buss off limphome active • Transmission fault lamp ON • Gearshift & Creep function is disabled • Vehicle cranking is disabled Lamp Status (If Any) • Transmission fault lamp ON Service indication 0x2 Fault Detection Condition CAN communication failure (either CRC or time-out or sequence counter) with the EMS node (on the receiving side, i.e. TCU = receiver) for > 1000ms Normal Operating Condition EMS ECU communicates properly with TCU Probable Trouble Area 1. engine controller and the CAN connection from the engine controller 2. vehicle side connector on TCU 3. wiring harness towards TCU 4. EMS ECU or node disconnected. 5. Loose connection of Fuses of EMS ECU. 6. Wrong data length (less than expected data) from EMS ECU Healing Condition The reaction is cleared at SW restart and driving if the detection is FALSE for more than 1000 ms Component Details:- Controller Area Network or CAN protocol is a method of communication between various electronic devices like engine management systems, ABS, gear control, lighting control, air conditioning, Airbags, central locking etc. Embedded in an automobile. Preliminary Checks:- 1) Check for short conditions between CAN_H-CAN_L, CAN_H-GND, CAN_L-GND, CAN_H-Vbatt and CAN_L-Vbatt at OBD connector. There should not be any short circuit conditions. 2) Check EMS ECU node is properly connected. 3) Check EMS ECU Fuse is properly fitted. Trouble Shooting:- Step Checks IF YES IF NO 1. Check the engine controller and the CAN connection from the engine controller. Check other modules on CAN, if this issue is reported. Fix the problem on engine controller. Go to step 2 2. If this issue is only reported in TCU, disconnect the vehicle side connector on TCU & connect it back again. Clear the DTC and check if the DTC does not come back. Go to step 3
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