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: 106 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.

P0113: Air Temperature Fault - Signal High

Overview:

DTC Description as per ISO standard

Intake Air Temperature Sensor 1 Circuit Low

ECU Pin Number

Customer Symptom

Probable power loss, Black smoke

Fault Effects (On Vehicle)

EGR is disabled

Injector learning strategy SPC & SPCS (MDP Updation) is

deactivated

Lamp Status (If Any)

MIL lamp is on

Fault Detection Condition (Root cause)

This DTC gets logged if inlet- air temperature reads by the

AMF sensor is greater than the upper threshold

Normal Operating Condition

No faults related to inlet air temperature faults

Probable Trouble Area

AMF - Air Mass Flow Temperature sensor (HFM)

Related wiring Harness, connector or terminals

ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

Component Details:

HFM sensor has an integrated NTC (Negative temperature co-efficient) sensor for sensing the inlet air temperature.

The Intake Air Temperature sensor (IAT) has been utilized as an Engine Control Unit (ECU) input signal, as a requirement

for calculating the Air Mass volume for the incoming air charge. This is, to assist in determining the correct engine fuel

requirement to suit the operating air temperature. It is important to maintain correct combustion mixtures during the

extremely hot winds of summer as well as the freezing night winds of winter. The density of the air varies with the air

temperature and with this, the amount of required fuel to ensure the correct mixture.

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.

Check for Reference voltage 1 fault (P0642, P0643) if present; Follow Reference voltage 1(sensor supply voltage

1) check and rectification Procedure, to correct this fault before proceeding further.

Check sensor connections for rust dirt etc., if noticed clean the sensor connections and ensure proper fitment.

Check sensor characteristics (measure voltage and resistance at sensor terminals); Sensor voltage should be 5 V

and resistance as given is specifications. Replace sensor if found faulty