TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

TATA BSVI Gasoline Program – EMS ECU Bosch DTC Troubleshooting Service Manual Version: 1.2 Date: 18-12-2019 Prepared By: Sunita Mandlik Checked By: Yeshwant Jadhav Approved By: Satish Kumar Document Part No: 2921 02 xxx xxxx Page: 299 of 1498 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. Technical Principle: The engine coolant temperature Sensor measures the temperature of the engine coolant. Coolant temperature Sensor is a Negative Temperature Coefficient type Sensor. The sensing element, together with the resistance network in the Engine Management System (EMS) module, provides a signal proportional to the coolant temperature to the EMS module. A reference voltage is provided to the Sensor/network by the module. The water temperature Sensor, 16TT provides water temperature input to ECU when placed in water stream. The 16TT has negative temperature coefficient with a 2 pin connector, is a semiconductor material which changes resistance depending on the surrounding temperature. The resistance decreases as temperature increases. Water temperature Sensor is mounted on thermostat housing (before thermostat), which is in contact with the engine coolant and tightened to a specified torque. Diagnosis Use multimeter to check for coil resistance across pin 1 and pin 2, which should be between 2500 ohms at 200C and 833.9 ohms at 500C. 1. ECU M1D4 :- -ve 2. ECU M1E4 :- +ve Use TATA diagnosis tool to check for 'Water Temp' values. Resistance and Temperature graph:- Table 1 :-