TML Gen3 IVI DTC Troubleshooting guide Version: 0.4 Draft Date: 04-Aug-23 Author: Hemant Mitra Page: 266 of 584 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. U0028-13: Vehicle Communication Bus A - open circuit Overview: ISO Code U0028-13 Customer Symptom • In case of IVI variant -No visual indication • In case of CDC variant -EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON,SRS Lamp ON, EBD Lamp ON Fault Effects (On Vehicle) • In case of IVI variant -Interfacing functions with Body Control Module, HVAC Control Module and Instrument Panel Cluster Module will not work. • In case of CDC variant -No vehicle speed, engine speed, temperature gauge and fuel computer will not be available. Lamp Status (If Any) In case of CDC variant: EPAS lamp ON , CE Lamp ON,MIL Lamp ON,ABS Lamp ON,SRS Lamp ON,EBD Lamp ON Fault Detection Condition Open circuit of the CAN_H (Main Connector IVI - BAY B, Pin No. 23) and/or CAN_L (Main Connector IVI - BAY B, Pin No. 24) Normal Operating Condition ECU communicates properly with TML diagnostic Tool. Probable Trouble Area CAN_H and CAN_L wires Healing Condition 1. Re-connection of the CAN_H (Main Connector IVI - BAY B, Pin No. 23) and/or CAN_L (Main Connector IVI - BAY B, Pin No. 24) 2. Removal of above-mentioned short circuit conditions
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