Vehicle Platform: Nexon-EV ,Nexon-MCE ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.4 Date: 16-09-2020 Author: TCM COC Page: 28 of 121 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. U1309 - 08:- Lost Communication with Antilock Braking System/Electronic Stability Program (ABS/ESP) Control Module - Bus Signal / Message Failures Overview: ISO Code U1309 – 08 Lost Communication With Antilock Braking System/Electronic Stability Program (ABS/ESP) Control Module - Bus Signal / Message Failures Customer Symptom Following Telematics features will not be working:- Alerts about critical car parameters (Including battery related alerts), View Car Health Dashboard Fault Effects (On Vehicle) N/A Fault Detection Condition Relevant functional DTCs present in TCU .DTC is set in case of Lost Communication With Antilock Braking System/Electronic Stability Program (ABS/ESP) Control Module Normal Operating Condition ABS/ESP ECU communicates properly with TCU in normal condition. Probable Trouble Area CAN_H and CAN_L wires CAN transceiver faulty Faulty ABS/ESP ECU The TCU has detected a communication problem on the CAN regarding the ABS/ESP Module CAN high / CAN low pins shorted to Battery/Open/ shorted to Ground CAN transceiver faulty DTC is to be logged when the subscribed message is not available on the CAN bus from ABS/ESP module Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify ABS/ESP DTCs and check for any related DTCs 3. Follow ABS/ESP trouble shooting guideline 4. Check CAN H and CAN L connections for short/open 5. Check for CAN transceiver faulty ,if it is fault then replace 6. Power down the device, power up again and wait for at least one minute. If the problem reoccurs, check whether any other CAN-related DTCs are set in the TCU. In that case, check for problems with the CAN hardware (TCU and bus) 7. Clear the DTC 8. If problem persists after above steps (from 1 to7) then Follow ABS/ESP ECU DTC trouble shooting guide
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