Electrical Fan Control Operation [Mzi-3.5]; Without Towing Package; With Towing Package - Mazda CX-9 2007 Service Highlights
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Also See for CX-9 2007:
- Owner's manual (502 pages) ,
- Installation instructions manual (18 pages) ,
- Quick tips (16 pages)
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ELECTRICAL FAN CONTROL OPERATION [MZI-3.5]
Without Towing Package
• 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
PCM output duty ratio
100 %
70—30 %
0 %
Refrigerant pressure control
PCM output duty ratio
44 %
53 %
100 %
With Towing Package
• 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
PCM output duty ratio
100 %
70—25 %
0 %
Refrigerant pressure control
PCM output duty ratio
45 %
52 %
100 %
End Of Sie
NG: PCM
CONTROL SYSTEM [MZI-3.5]
Engine operation conditions
• Engine coolant temperature is less than 96°C {205°F}.
• Engine coolant temperature is 96—106°C {205—223°F}.
• Engine coolant temperature is more than 106°C {223°F}.
Engine operation conditions
• When all of the following conditions are met:
— A/C is on.
— Refrigerant pressure switch (medium pressure) is on.
• 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 less.
• 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.
Engine operation conditions
• Engine coolant temperature is less than 96°C {205°F}.
• Engine coolant temperature is 96—106°C {205—223°F}.
• Engine coolant temperature is more than 106°C {223°F}.
Engine operation conditions
• When all of the following conditions are met:
— A/C is on.
— Refrigerant pressure switch (medium pressure) is on.
• 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 less.
• 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.
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