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Nexon Gasoline – EMS ECU Bosch
DTC Troubleshooting Manual
Version: 0.1
Date: 26-08-2017
Prepared By: Sunu S Babu/Yogesh Jadhav
Checked By: Yeshwant Jadhav
Approved By: Satish Kumar
Document Part No: 2921 02 224 A1736
Page: 186 of 1203
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.
P0116-23: Engine Coolant Temperature Sensor Circuit Range/ Performance - Signal Plausibility
Failure – Signal Stuck Low
Overview:
ISO Code
P0116-23
Customer Symptom
High Temperature warning lamp blinks, Cooling Fans runs continuously.
Fault Effects (On Vehicle)
Cooling Fans runs continuously till next driving cycle, Calculated temperature
value is used for engine functionality.
Lamp Status (If Any)
MIL ON after 3 drive cycle
Fault Detection Condition
This fault gets detected at Ignition On, when the Coolant Temperature signal
is implausible with respect to the Engine Operating condition.
Normal Operating Condition
Coolant Temperature Sensor signal will be plausible with respect to Engine
operating condition and Cooling Fans will be on when the Coolant temperature
value is greater than a calibratable threshold.
Probable Trouble Area
Wiring Harness Connections / Sensor
Healing Condition
After 3 driving cycles, when the Ignition is ON.
Fault permanent deletion
1. Clear DTC Command form Scan tool
2. Stack Over Flow.
3. 40 warm up cycles.
4.ECU flashing
5. ECU Power-Fail
Component Details:
The temperature sensing Circuit uses Thermistor that is sensitive to change in temperature. It has basically the NTC
(Negative Temperature Coefficient) means as the temperature increases, the resistance decreases
Preliminary Checks:
1) Loose/ Damaged Connections between Sensor and EMS ECU.
2) Check for back out of pins at both Sensor connector and ECU connector.
3) Check for damage of pins at both Sensor connector and ECU connector.
4) Check the continuity from Sensor connector pins to the ECU pins.