Electric Fan Control - Mazda 6 Training Manual

Operation Conditions
• While A/C is operating, the PCM cuts off the power supply to the A/C relay as shown below.
A/C cut-off condition
During cranking
Throttle valve is open more than 50%
ECT is above 113 °C {235 °F}
ECT is above 118 °C {244 °F}
End Of Sie

ELECTRIC FAN CONTROL

Operation
L8, LF (Intensely hot area) and L3 engine models
Condition
Cooling fan Cooling fan
motor No. 1 motor No. 2
Stopped Stopped
Low speed Low speed
High speed High speed
Low speed Low speed
High speed Middle speed
High speed High speed
CONTROL SYSTEM
A/C cut-off time
For appro. 4.0 s
For appro. 5.0 s
Alternates between on and off for 10 seconds
until ECT falls to 107 °C {225 °F}
Until engine ECT falls below 113 °C {235 °F}
PCM terminal 4L PCM terminal 4B
OFF OFF
ON ON
ON ON
ON ON
ON OFF
ON ON
Startability improvement
Acceleration performance
improvement
Engine reliability improvement
PCM terminal 4F Operation condition
A/C: OFF
OFF
ECT: below 100 °C [176 °F]
A/C: OFF
OFF ECT: 100—108 °C [212—226
°F]
A/C: OFF
ON
ECT: above 108 °C [226 °F]
A/C: ON (middle switch OFF)
OFF
ECT: below 108 °C [226 °F]
A/C: ON (middle switch ON)
ON
ECT: below 108 °C [226 °F]
A/C: ON
ON
ECT: above 108 °C [226 °F]
Purpose
F
A6E394018881T14
ON: Energized
OFF: De-energized
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