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: 337 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.

P1101: AMF sensor electrical fault

Overview:

DTC Description as per ISO standard

AMF sensor electrical fault

ECU Pin Number

Customer Symptom

Probable loss of power and black smoke

Fault Effects (On Vehicle)

Disables EGR by setting desired rate to 0. This will affect

EGRH rate, EGRL rate, Throttle, Intake manifold

pressure and boost pressure

Lamp Status (If Any)

CE & MIL lamp is on

Fault Detection Condition (Root cause)

This DTC gets logged due to AMF sensor electrical fault -

Look for P0101, P0102, P0103, P0104,P642, P0643, these

faults are the reason for AMF - sensor fault (P1101)

Normal Operating Condition

No Faults related to AMF sensor

Probable Trouble Area

AMF - Air Mass Flow sensor (HFM)

Related wiring Harness, connector or terminals

ECU

Healing Condition

Rectify the error

Clear through diagnostic tool

Ignition OFF & ON

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, P0102; P0103; P0104, P0642, P0643; Follow their rectification process for the faults,

before proceeding further.