Mazda Speed 6. Manual - part 3

 

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Mazda Speed 6. Manual - part 3

 

 

01 ENGINE

14

High Pressure Fuel Rail
The fuel rail supplies fuel to the injectors.  The fuel rail pressure sensor supplies 
pressure information to the PCM. A pressure relief valve inside the low pressure 
return line allows pressure over 1885 psi to return to the low pressure side of the 
high pressure fuel pump.

High Pressure Pump Internal Construction
A trochoid drive on the camshaft at the rear of the cylinder head drives the high 
pressure pump.  When the PCM energizes the spill control solenoid fuel enters 
the pump chamber.  When the spill solenoid is commanded off, the high pressure 
chamber is isolated and can build high pressure.  The one way check valve assures 
high pressure can only go one direction, into the rail.

Low pressure 
fuel return to 
pump (internal 
pressure relief) 

In from high 
pressure pump

Fuel rail

Fuel pressure 
sensor

Plunger

Pulsation 
damper

Spill control 
solenoid

High 
pressure 
to rail

Low 
pressure 
from tank

One-way 
check valve

Pump chamber

Trochoid pump 
drive

Valve

01 ENGINE

15

Injector Driver Module
The PCM fi res the injectors with the injector driver module.  Because the fuel system 
is running at up to 1885 PSI, it requires more energy to open the fuel injectors.  The 
injector driver module turns the injectors on with +100 volts.  The injector is then held 
open with +12 volts.  The injector driver module then closes the injectors with -100 
volts.  The injector driver module is located at the rear of the drive strut tower.

High Pressure Fuel Injectors

Removal requires a special tool similar to O

2

 sensor socket, 

fuel pressure 

must be released

 and intake manifold must be removed.  The tool is rocked 

left to right to loosen any carbon holding the injector.  

01 ENGINE

16

The #3 injector requires cutting the corner off of the PCV catch tank to allow more 
clearance.

 

01 ENGINE

17

Turbocharger

The main components of the turbocharging system are:

Air ducts and charge air cooler (Intercooler)

Turbocharger

Waste gate
Waste gate actuator

Boost control: 

Waste gate control solenoid
Air bypass valve

 

 

 

 

 

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