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OSPREY- Application
DTC Troubleshooting Data
Version: 4.0
Date: 10-02-2017
Prepared by: Mithipati Prasad
Checked by: G S Raju / Senthilnathan S
Page: 110 of 654
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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.
P0115: Coolant Temperature Fault – Generic
Overview:
DTC Description as per ISO standard
Engine Coolant Temperature Sensor 1 Circuit
ECU Pin Number
72
Customer Symptom
Power Loss
AC Will not work
Fault Effects (On Vehicle)
Radiator fan (Fan 1) running at full speed.
Reduced torque Mode activated
EGR gets disabled
AC compressor will not be engaged & Speed Pilot Control disable group
fault logged.
Lamp Status (If Any)
CE Lamp & MIL Lamp is on
Fault Detection Condition (Root cause)
This DTC gets logged if any of the following P-
code’s
logged are P0116,
P0117, P0118, and P0119.
Normal Operating Condition
No Faults related to coolant temperature sensor
Probable Trouble Area
Coolant temperature sensor, ECU, Grounding points, Wiring harness
Healing Condition
Clear the errors, Ignition OFF to ON, engine running for min 5deg
temperature rise
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. Based on the Engine
coolant temperature, EMS controls the Fuel Injection and cooling fan operation. Engine coolant temperature information
will also be displayed on the Instrument cluster.
Preliminary Checks:
x
Check whether the customer voice / view about the issue is matching with the fault effects mentioned above. If
yes, go ahead with next steps. If not, check fo
r other DTC’s presence.
x
Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to
earlier issue closure.
x
Loose/ Damaged Connections between Sensor and EMS ECU.
x
Check for back out of pins at both Sensor connector and ECU connector.
x
Check for damage of pins at both sensor connector and ECU connector.