Diagnostic Manual (MBFM) MAN-00068-68
October 2009/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 Authorised Service Centre of Mahindra & Mahindra Ltd., will amount to unauthorized use and shall be liable for
penalty/prosecution© 2009 Mahindra & Mahindra Ltd.
Battery Voltage
Code Label
B 1068 Power ( Battery) under voltage (< 8 volts)
B 1069 Power ( Battery) over voltage ( > 16 Volts)
The battery voltage is monitored by the MBFM
The correct operating range is 9 V to 16 V.
Below 9 Volts the System is in under voltage state. Below 8 V the system will stop all the
outputs. If the system notices below 8 V and when the vehicle reports at workshop that
time it is OK then please check for the cause of low voltage ( excess current being drawn-
dark current, short which got compensated by charging system)
Above 16 V is over voltage. At this voltage also the MBFM will stop functioning.
This information is also useful to find out the root cause of any ECU or electronic failure.
For this also the charging system and the complete wiring should be investigated to
prevent recurrence.
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