Evaporative Purge Control Operation; Evaporative Purge Control Execution Condition; Determination Of Purge Solenoid Valve Energization Period; Metering Oil Pump Control Outline - Mazda RX-8 2004 Service Highlights

EVAPORATIVE PURGE CONTROL OPERATION

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

• 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
Function
Energization off function
Initial-set function
Regular drive function
Ignition switch off function
Monitor function
Fail-safe function
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CONTROL SYSTEM
Stops control at engine off, lowering the battery current consumption.
Detects the 0-step position and sets to the reference position for regular drive.
Control to calculated target step based on engine operation conditions.
Shortens operation time of initial-set function.
Verifies that the target step and the actual step correspond.
Controls engine output to protect the engine if a malfunction in the metering oil
pump system occurs.
Purpose
01–40–31
CHU014000140S35
01–40
CHU014000140S36