Mazda 2004 RX-8, Особенности сервиса

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CONTROL SYSTEM
01–40–35
01–40
HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL BLOCK DIAGRAM
CHU014000140S40
•
The PCM determines the engine conditions based on input signals and sends an operation signal to the front or
rear HO2S.
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HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OPERATION
CHU014000140S41
Operation Conditions
•
The PCM operates the HO2S when the following conditions are met.
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A/C CUT-OFF CONTROL OUTLINE
CHU014000140S42
•
The current application (energize/de-energize) to the A/C relay (magnetic clutch) is controlled according to the
engine operation conditions to prevent deterioration of engine performance, damage to the engine, and
deterioration of the A/C function.
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PCM
ECT SENSOR
IAT SENSOR
FRONT HO2S HEATER
BARO SENSOR
ECCENTRIC SHAFT
POSITION SENSOR
BATTERY
MAF SENSOR
REAR HO2S HEATER
IGNITION SWITCH
CHU0140S031
HO2S Activation condition Drive signal
Front
•
After engine start
•
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).
•
ECT is 5
°
C {41
°
F} or more.
•
Battery positive voltage is 9 V or more and less
than 16 V.
•
MAF sensor is normal (no DTC is stored in
PCM).
•
The PCM outputs a duty signal.
•
The element temperature is measured by the
impedance of the HO2S and a duty ratio is
determined.
Rear
•
Starter is off
•
After engine start
•
After the engine has started and a fixed period
of time has elapsed (the time period after the
engine starts lenghtens if the ECT falls below
0
°
C {32
°
F}.
•
ECT is 10
°
C {50
°
F} or more.
•
Battery positive voltage is 9 V or more and less
than 16 V.
•
Charging efficiency is the fixed value or less, or
during fuel cut.
•
The PCM outputs a duty signal. However the
duty signal is either 100% or 0%.