ELECTRICAL FAN CONTROL OPERATION [MZR-CD 2.2]

id0140f2104000

•  The PCM compares the duty ratios determined at the engine coolant temperature and refrigerant pressure controls and sends the higher duty ratio as the control signal to the fan control module.

Engine Coolant Temperature Control

During no diesel particulate filter regeneration

PCM output duty ratio

Engine operation conditions
90 %
•  Engine coolant temperature is 108 °C {226 °F} or more.
10 %
•  Engine coolant temperature is reducing from 100 °C {212 °F} to 98 °C {208 °F}.
0 %
•  Engine coolant temperature is rising 100 °C {212 °F}.

During diesel particulate filter regeneration (diesel particulate filter regeneration mode to be switched off at 40 km/h {25 mph})

PCM output duty ratio

Engine operation conditions
90 %
•  Engine coolant temperature is 105 °C {221 °F} or more.
10 %
•  Engine coolant temperature is reducing from 100 °C {212 °F} to 98 °C {208 °F}.
0 %
•  Engine coolant temperature is rising 100 °C {212 °F}.


Refrigerant Pressure Control

PCM output duty ratio

Engine operation conditions
60 %
•  When all of the following conditions are met:
―  A/C is on.
―  Refrigerant pressure switch (medium pressure) is on.
40 %
•  When all of the following conditions are met:
―  A/C is on.
―  Refrigerant pressure switch (medium pressure) is off.
―  Vehicle speed is 40 km/h {25 mph} or less or rising from 40 km/h {25 mph} to 45 km/h {28 mph}.
30 %
•  When all of the following conditions are met:
―  A/C is on.
―  Refrigerant pressure switch (medium pressure) is off.
―  Vehicle speed is rising from 45 km/h {28 mph} to 70 km/h {43 mph} or reducing from 45 km/h {28 mph} to 40 km/h {25 mph}.
0 %
•  When all of the following conditions are met:
―  A/C is on.
―  Refrigerant pressure switch (medium pressure) is off.
―  Vehicle speed is 70 km/h {43 mph} or more or reducing from 70 km/h {43 mph} to 65 km/h {40 mph}.
•  A/C is off.