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: 123 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.

P0118: Coolant Temperature Fault – High

Overview:

DTC Description as per ISO

standard

Engine Coolant Temperature Sensor 1 Circuit High

ECU Pin Number

Customer Symptom

Power Loss

AC will be Off

Fans always running in High speed if Engine is running for certain

duration of time.

Fault Effects (On Vehicle)

Reduced torque Mode

Injector learning strategy is deactivated, (MDP Updation is deactivated)

System coolant temperature slowly moves to recovery value of 105

deg.

This DTC will also set P0115 - Coolant temp fault.

Lamp Status (If Any)

CE Lamp & MI Lamp is on.

Fault Detection Condition (Root

cause)

This DTC gets logged if the coolant temperature reads by the sensor is

greater than upper threshold. Radiator fan (Fan 1) running at full speed.

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:

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 othe

r DTC’s presence.

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

earlier issue closure.

Loose/ Damaged Connections between Sensor and EMS ECU.

Check for back out of pins at both Sensor connector and ECU connector.

Check for damage of pins at both sensor connector and ECU connector.

Trouble Shooting: