NEXON DIAGNOSTIC MANUAL

OSPREY- Application

DTC Troubleshooting Data

Version: 4.0

Date: 10-02-2017

Prepared by: Mithipati Prasad

Checked by: G S Raju / Senthilnathan S

Page: 114 of 654

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: Coolant Temperature Plausibility Fault

Overview:

DTC Description as per ISO standard

Engine Coolant Temperature Sensor 1 Circuit Range/Performance.

ECU Pin Number

Customer Symptom

Power Loss

AC will be off.

Fans continuously running in High speed when the Engine is

running for a certain duration of time.

Fault Effects (On Vehicle)

Reduced torque Mode activated

Injector learning strategy is deactivated (MDP Updation is

deactivated)

System coolant temperature slowly moves to recovery value of 80

degC

This DTC will also set P0115 - Coolant temp fault

Lamp Status (If Any)

CE Lamp & MIL Lamp is on.

Fault Detection Condition (Root cause)

This DTC gets logged if Coolant Temperature rise is not detected

for a calibratable duration after engine starting in a warm area of

Engine.

This fault will be detected if Coolant temperature sensor electrical

faults are not logged by EMS and based on Engine speed and

Engine load, EMS confirms that Engine is warmed up.

This DTC also gets logged if during Engine running time, there is no

change in coolant temperature

Normal Operating Condition

Diagnostic tool display the value of coolant temperature in degrees

at ignition ON condition, engine idle & vehicle running conditions

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:

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 for other DTC’s presence.

Check whether similar complaints are earlier reported. If yes, perform the preliminary checks with respect to

earlier issue closure.