Mazda 2004 RX-8, Особенности сервиса

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CONTROL SYSTEM
01–40–31
01–40
EVAPORATIVE PURGE CONTROL OPERATION
CHU014000140S35
Evaporative Purge Control Execution Condition
•
When the following conditions are met, the evaporative purge control sends a duty signal to the purge solenoid
valve.
— During fuel injection control feedback
— Fuel system and MAF sensor are normal
— Approx. 30 s have elapsed since engine start
— ECT is 60
°
C {140
°
F} or more
Determination of Purge Solenoid Valve Energization Period
•
The duty ratio of the duty signal (ratio of on time per 1 cycle) is calculated based on the amount of purge flow
and the differential pressures of the injectors. The amount of purge flow is determined by the estimated intake
air passage pressure and barometric pressure calculated by the engine speed and charging efficiency. The
differential pressure of the injectors is determined by the BARO and the estimated intake air passage pressure.
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METERING OIL PUMP CONTROL OUTLINE
CHU014000140S36
•
Controls the amount of plunger stroke which determines the amount of oil delivery through the stepping motor
according to the engine operation conditions.
•
The plunger opens and closes by the stepping motor in the metering oil pump.
•
The PCM determines the target step number of the stepping motor from input signals for engine speed,
charging efficiency and ECT, and sends an operation signal to the stepping motor. For the construction and
operation of the metering oil pump, refer to metering oil pump construction/operation. (See 01–11–5
METERING OIL PUMP CONSTRUCTION/OPERATION.)
•
The metering oil pump control includes the energization off function, the initial-set function, the normal drive
function, the ignition switch off function, the monitor function, and the fail-safe function.
Function List
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Function Purpose
Energization off function Stops control at engine off, lowering the battery current consumption.
Initial-set function Detects the 0-step position and sets to the reference position for regular drive.
Regular drive function Control to calculated target step based on engine operation conditions.
Ignition switch off function Shortens operation time of initial-set function.
Monitor function Verifies that the target step and the actual step correspond.
Fail-safe function Controls engine output to protect the engine if a malfunction in the metering oil
pump system occurs.