Fuel Injection Control Block Diagram [13B-Msp]; Fuel Injection Control Operation [13B-Msp]; Fuel Injection Timing - Mazda RX-8 2009 Service Highlights

FUEL INJECTION CONTROL BLOCK DIAGRAM [13B-MSP]

The PCM determines the engine operation conditions based on input signals and operates the injectors to
inject fuel with the optimum fuel injection timing and fuel injection time (fuel injection amount).
ECT SENSOR
IAT SENSOR
MAF SENSOR
A/F SENSOR
HO2S
BARO SENSOR
(BUILT INTO PCM)
BATTERY
TP SENSOR NO.1, NO.2
APP SENSOR NO.1, NO.2
ECCENTRIC SHAFT POSITION
SENSOR
CPP SWITCH (MT)
NEUTRAL SWITCH (MT)
BRAKE SWITCH
A/C SWITCH
IGNITION SWITCH
CAN
End Of Sie

FUEL INJECTION CONTROL OPERATION [13B-MSP]

Fuel Injection Timing

The PCM calculates the optimum fuel injection timing according to the engine operation conditions and
operates the injectors.
The fuel injection timing is controlled at engine start and after engine start.
At engine start (engine speed is within 500 rpm), fuel injection timing control at engine start is performed and
after determining that the engine has started (engine speed is 500 rpm or more), injection timing control after
engine start is performed.
Fuel injection timing at engine start
— The injection timing at engine start operates for a period until engine start has been determined and injects
at BTDC 455 CA (crank angle position).
01-40–14
2009 Mazda RX-8 Service Highlights (3452–1U–08C)
CONTROL SYSTEM [13B-MSP]
CONTROL ITEM
ENGINE SPEED
BASIC INJECTION TIME
AT ENGINE START
ENGINE SPEED CORRECTION
THROTTLE OPENING ANGLE
VOLUME REDUCTION CORRECTION
VOLUME REDUCTION
CORRECTION AT ENGINE START
INEFFECTIVE INJECTION TIME
FAST IDLE CORRECTION
WARM-UP VOLUME INCREASE
CORRECTION COEFFICIENT
VOLUME INCREASE CORRECTION
COEFFICIENT AFTER ENGINE START
VOLUME INCREASE CORRECTION
AT HIGH TEMPERATURE ENGINE
RESTART
ACCELERATION CORRECTION
POWER VOLUME INCREASE
CORRECTION
AIR-FUEL RATIO LEARNING
CORRECTION
PURGE CORRECTION
AIR-FUEL RATIO FEEDBACK
CORRECTION
BASE ENGINE
DEMAND FUEL RATIO
INJECTOR MAX/MIN INJECTION TIME
INEFFECTIVE INJECTION TIME
NON-SYNCHRONIZED INJECTION AT
ENGINE START
NON-SYNCHRONIZED INJECTION AT
ACCELERATION
NON-SYNCHRONIZED INJECTION TIME AT
FUEL CUT RECOVERY
TRACTION CONTROL (DSC) FUEL CUT
FUEL CUT AT CONTINUOUS HIGH ENGINE SPEED
(ABOVE 200 KM/H {124.3 MPH})
FUEL CUT AT ABNORMAL ELECTRONIC
THROTTLE CONTROL
FUEL CUT AT DECELERATION
PCM
CALCULATED ITEM
FUEL
INJECTION
TIMING
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FUEL INJECTOR (FP, FS)
FUEL INJECTOR (RP, RS)
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