DIAGNOSTIC MANUAL MAN-00201
QUANTO
EMS
SEP 2012/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
© 2012 Mahindra & Mahindra Ltd.
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P0100
BATTERY VOLTAGE ERROR OF HFM7 SENSOR
HFM SENSOR
Mass air flow rate is measured by detection of heat transfer from a hot film probe.Because of 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 supplied from the engine control module. This results in the change of the temperature of the hot
film probe and in turn change of resistance.
DTC INFORMATION
PROBABLE CAUSES OF FAILURE
NORMAL OPERATION
Ignition ON
The HFM sensor outputs a voltage, which corresponds to the
intake airflow.
The ECU checks whether this voltage is within a specified
range.
DTC DETECTING CONDITIONS
Ignition ON
EMS ECU supply voltage 8-16V
The battery supply voltage to HFM sensor is more than 16.8 V
for few seconds.
DTC REACTIONS
Engine Check lamp will be continuously BLINKING.
Reference signal monitoring is not available.
HEALING CONDITION
Ignition Off/On
Faulty Battery
Faulty Charging System
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