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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P06A1
SHORT CIRCUIT TO GROUND ERROR ON POWER STAGE FOR THE COMPRESSOR
AC COMPRESSOR POWER STAGE
The AC Compressor is controlled by the EMS ECU under the feedback of the temperature sensing unit in
the HVAC system and pressure sensors measuring the pressure of the refrigerant flow in the air
conditioning circuit. The ECU monitors the status of the Power Stage (Actuator) of the Compressor Clutch
for monitoring
hardware errors such as short circuit to battery, Short circuit to ground and Open load.
DTC INFORMATION
PROBABLE CAUSES OF FAILURE
NORMAL OPERATION
Ignition ON
EMS ECU switches ON the compressor once it recieves AC
switch ON signal thru thermoamplifier via high low
pressure switch
No malfunction detected by EMS ECU in the AC compressor
power circuit
DTC DETECTING CONDITIONS
Ignition ON
EMS ECU supply voltage 8-16V
Short to ground is detected in AC compressor relay control
circuit
DTC REACTIONS
AC Compressor Shuts OFF
HEALING CONDITION
Ignition Off/On
Short to Ground in AC
compressor relay control
wire
Faulty AC compressor
relay
Faulty EMS ECU
299
