Vehicle Platform & ECU Name DTC Troubleshooting Data Ver: 1.0 Date: 30/11/2019 Author: ERC Page 76 of 610 Copyright by TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without our consent P0115- 00- Engine Coolant Temperature Sensor 1 Circuit Overview: Code Cause Effect on Vehicle Fault Code: P0115-00 1.Coolant Temp sensor connection 2.Electrical wiring 3.ECU connection 4.Coolant Sensor malfunctioning 1.MIL Lamp On 2.Cylinder balancing disabled 3.Reduced performance Checkpoints: 1. Check Battery Voltage Trouble Shooting Steps: Sr. No. Steps Rectification Step 1 Check connector is connected properly Remove and connect again Step 2 Check for continuity between sensor connector pins 1, 2, and ECU pins A35, A4 respectively. Check the continuity Step 3 Check the ECU connector is connected properly Connect the ECU connector properly Step 3 Check the sensor physically Physical check Step 4 If the problem persists, replace the sensor - Circuit Description: ECM detects engine coolant temperature via the engine coolant temperature sensor. The sensor modifies a voltage signal from ECM. The modified signal returns to ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. Circuit Schematic Diagram:
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