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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P0691
FAN 1 CONTROL CIRCUIT LOW
COOLING FAN LOW SPEED
The cooling fans are controlled by EMS ECU . Both the fans run either at low speed or at high speed. The
low speed of the cooling fans are controlled by pressure switch relay . Based on the coolant temperature
the EMS ECU controls the pressure switch relay to activate the low speed of the fans. Fans are ON at low
speed if the coolant temperature reaches 99 °C
.
DTC INFORMATION
PROBABLE CAUSES OF FAILURE
NORMAL OPERATION
Ignition ON
Depending upon the coolant temperature , the EMS ECU
controls the low speed cooling fan
No malfunction detected by EMS ECU in the control circuit
of pressure switch relay
DTC DETECTING CONDITIONS
Ignition ON
EMS ECU supply voltage 8-16V
Short to ground is detected in in the control circuit of
pressure switch relay
DTC REACTIONS
Fans always ON at low speeds
HEALING CONDITION
Ignition Off/On
Short to ground t in
pressure switch relay
control wire
Faulty pressure switch
relay
Faulty EMS ECU
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