TML Gen3 IVI DTC Troubleshooting guide Version: 0.4 Draft Date: 04-Aug-23 Author: Hemant Mitra Page: 411 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. Trouble Shooting:- Turn ON Ignition. Connect the TML Diagnostic Tool. Check the status of DTC’s (Memorized/Current) Record the DTC & Clear DTC’s Turn Ignition OFF & ON Verify If DTC B190B -15 is present Is DTC B190B-15 is Present? Check for continuity between Connector A, Pin No. 5 (Batt) & Connector C, Pin no. 26 of ECU Connector or OAT harness is open circuited. Is STB or Open is present? OAT input is Short Circuit to Battery or Open. Check the CAN signal o/p and it shall be transmitted as 25 Deg.C from IC ECU and status as implausible Rectify Fault at wiring Harness & wait for 20sec to recover the fault. Clear the DTC. Verify the function of OAT Sensor with multimeter & OAT value on display. Clear the DTC from the ECU memory. Turn Ignition OFF & ON. Press the mode switch button one time to show the OAT display value & Check whether display is showing the OAT value in Deg.C. YES NO YES NO Stop
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