DIAGNOSTIC MANUAL
MAN-00152
EMS
OCT 2011/Rev 1
The repair methods given by the manufacturer in this document are based on the technical specifications, current at the time of release. The methods may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from which the vehicles are manufactured. The reproduction, translation, transmission, in part of or whole of the present document,
are prohibited without the prior written consent of Mahindra & Mahindra Ltd. The use of this document by any person other than the trained personnel, at the Authorized Service Centre of Mahindra & Mahindra Ltd.,
will amount to unauthorized use and shall be liable for penalty/prosecution
© 2011 Mahindra & Mahindra Ltd.
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P0102- Signal range check for HFM7 sensor signal below minimum limit
HOT FIL AIR MASS SENSOR
Mass air flow rate is measured by detection of heat transfer from a hot film probe because the change of
the mass air flow rate causes change in the amount of heat being transferred from the hot film probe
surface to the air flow. The airflow sensor generates a pulse so it repeatedly opens and closes between
the 5V voltage supplied from the engine control module. This results in the change of the temperature of
the hot film probe and in the change of resistance.
COMPONENT LOCATION
NORMAL
OPERATION
During ignition ON , HFM sensor outputs a voltage with respect to the intake
air flow to EMS ECU and is within the range
DTC DETECTING
CONDITION
The measured output voltage of the sensor is less than 0.5 V for 0.5 Second
PROBABLE
CAUSES
HFM power supply wire short to ground/open
HFM (air mass) signal wire short to ground/open
HFM ground wire open
HFM sensor internal failure
LAMP
STATUS
OBD lamp ON
DTC REACTION
EGR switches OFF
HEALING
CONDITION
Ignition Off/On
