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: 60 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.

P0103: AMF sensor electrical fault –Signal High

Overview:

DTC Description as per ISO standard

Mass or Volume Air Flow “A” Circuit

High

ECU Pin Number

Customer Symptom

MIL lamp is on.

Fault Effects (On Vehicle)

Probable loss of power and black smoke

This DTC will also cause P1101 to get registered

Lamp Status (If Any)

MIL lamp is on

Fault Detection Condition (Root cause)

This DTC gets logged if the air flow value reads from the AMF

sensor is more than the upper threshold.

Normal Operating Condition

No faults related to Air mass flow sensor

Probable Trouble Area

AMF - Air Mass Flow & Temperature sensor (HFM)

Related wiring Harness, connector or terminals

ECU, Charge air leakage,

Healing Condition

1 driving cycle after fault rectification

Component Details:

The operating principle is based on the heating of a diaphragm (sensitive element containing

two resistances upstream and downstream of the support) in a by-pass duct through which the engine intake air flows.

The hot film membrane is maintained at constant temperature (about 120 °C higher than the incoming air temperature) by

the specific heating resistance controlled by the management electronics. The mass of air passing through the by-pass

duct, giving off heat to the membrane, thermally unbalances the two resistances to an extent directly proportional to the

mass of the incoming fluid, an imbalance that is translated through the control circuit into a resistance variation,

electronically processed and translated into a frequency value to be sent to the engine management control unit. The

imbalance in the resistance value also makes it possible to determine the direction of the column of air. As far as the air

temperature information is concerned, it is sent to the engine management control unit via a dedicated pin in the form of a

duty cycle signal (rectangular wave). The value of the duty is proportional to the value of the temperature.

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 faults P 0101, P0104, P0642, P0643; Follow rectification process for the faults, before proceeding

further.

Check for air filter clogging, Intake air passage blocked, wrong assembly/fitment in Intake air circuit etc; Clean

the inlet air circuit and remove any clogging.

Check for any damages on Intercooler pipes