Mazda 2009 RX-8, Особенности сервиса

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CONTROL SYSTEM [13B-MSP]
01-40–23
01-40
AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OPERATION [13B-
MSP]
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Operation Conditions
x
The PCM operates the A/F sensor or HO2S heater when the following conditions are met.
A/F sensor heater
HO2S heater
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ELECTRICAL FAN CONTROL OUTLINE [13B-MSP]
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x
Cooling fan relays No.1, No.2/ No.3, No.4/ No.5 turn on and off to control operation timing and rotation speed of
the cooling fan motor according to the engine conditions. Due to this, the radiator and condenser are cooled
efficiently, preventing overheating and overcooling.
x
The electrical fan control includes the regular-driving cooling function and the after-cooling function.
x
The regular-driving cooling function operates according to the engine conditions during the engine operation.
x
The after-cooling function operates when the vehicle has stopped at high engine temperature (ignition switch
off).
x
After the ignition switch is turned off, a main relay on request is sent to operate the after-cooling function.
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ELECTRICAL FAN CONTROL BLOCK DIAGRAM [13B-MSP]
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x
The PCM determines the engine conditions based on input signals and sends an on/off signal to cooling fan
relay No.1 or No.2/No.3 or No.4/No.5.
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ELECTRICAL FAN CONTROL OPERATION [13B-MSP]
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x
When the operation conditions are met for each function, the PCM sends an operation signal to cooling fan
relay No.1 or No.2/No.3 or No.4/No.5 to operate the cooling fan motors.
x
The rotation speed of the cooling fan motor is switched between three levels according to a combination of the
cooling fan relays.
x
The cooling fan rotates at low speed when only cooling fan relay No.1 is on, at middle speed when cooling fans,
in addition to No.1, No.2 and No.3 are on, and at high speed when cooling fans No.4 and No.5 turn on.
x
After engine start
x
After the engine has started and a fixed period
of time has elapsed (the elapsed time period
after the engine starts is determined by ECT).
x
ECT is 5
q
C {41
q
F} or more.
x
Battery positive voltage is 9 V or more and less
than 16 V.
x
MAF sensor is normal (no DTC is stored in
PCM).
x
The PCM outputs a duty signal.
x
The element temperature is measured by the
impedance of the A/F sensor and a duty ratio is
determined.
x
Starter is off
x
After engine start
x
After the engine has started and a fixed period
of time has elapsed (the time period after the
engine starts lengthens if the ECT falls below
0
q
C {32
q
F}.
x
ECT is 10
q
C {50
q
F} or more.
x
Battery positive voltage is 9 V or more and less
than 16 V.
x
Charging efficiency is the fixed value or less, or
during fuel cut.
x
The PCM outputs a duty signal. However the
duty signal is either 100% or 0%.
PCM
ECT SENSOR
A/C SWITCH
COOLING FAN RELAY NO.1
COOLING FAN RELAY NO.2
COOLING FAN RELAY NO.3
REFRIGERANT PRESSURE SWITCH
(MIDDLE)
COOLING FAN RELAY NO.4
COOLING FAN RELAY NO.5
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