Fuel Injector Function; Fuel Injector Construction/Operation; Fuel Pump Relay Function - Mazda RX-8 2004 Service Highlights

FUEL INJECTOR FUNCTION

• Injects fuel according to fuel injector control signals from the PCM.
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FUEL INJECTOR CONSTRUCTION/OPERATION

Fuel Injector (FP1, RP1)
• Installed on the intermediate housing at an angle of approx. 45° ° ° ° , and injects fuel near the intake port opening.
• Mainly consists of a coil, spring and needle valve.
• Fuel injector with 12 injection holes and injection angle of approx. 30° ° ° ° adopted to enhance fuel injection
vaporization.
• When a PCM signal is sent, exciting current passes through the coil, pulling in the needle valve and injecting
fuel.
• The amount of injection is determined by the open time of the needle valve, i.e. the energization time of the coil.
Fuel Injector (FP2, RP2, FS, RS)
• Installed on the intake manifold.
• Mainly consists of a coil, spring, and needle valve.
• Injects fuel into the intake manifold at an angle of approx. 19° ° ° ° , so that the fuel is drawn into the housing
together with intake air.
• When a PCM signal is sent, exciting current passes through the coil, pulling in the needle valve and injecting
fuel.
• The amount of injection is determined by the open time of the needle valve, i.e. the energization time of the coil.
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FUEL PUMP RELAY FUNCTION

• Controls the fuel pump on/off according to control signals from the PCM.
• For fuel pump relay control, refer to CONTROL SYSTEM, FUEL PUMP CONTROL. (See 01–40–23 FUEL
PUMP CONTROL OUTLINE, 01–40–24 FUEL PUMP CONTROL BLOCK DIAGRAM, 01–40–24 FUEL PUMP
CONTROL OPERATION.)
• Supplies voltage to the fuel pump via the fuel pump resistor when the fuel pump speed control relay is off.
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01–14–8
FUEL SYSTEM
SPRING
MAIN FUSE BLOCK
COIL
NEEDLE VALVE
FUEL PUMP RELAY
CHU011413250S01
CHU011413250S02
CHU0114S004
CHU011413350S05
CHU0114W001