Turbocharging System; Component Descriptions - Mazda 626 MX-6 Workshop Manual

1988
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4B

TURBOCHARGING SYSTEM

TURBOCHARGING SYSTEM
This system utilizes the energy of the exhaust gas to pressurize the intake air. It therefore supplies
more than the normal amount of air into the combustion chamber. As a result of the more fully charged
combustion chamber, higher output and higher torque can be obtained by a turbocharged engine
than that of a comparable non-turbocharged engine.
If knocking occurs during high-boost condition, the maximum boost is reduced by the solenoid valve
to prevent possible engine damage.

COMPONENT DESCRIPTIONS

Component
Air bypass valve
Bypasses compressed air from after tur­
bocharger to before turbocharger during
deceleration; prevents noise
Detects signals from input sensors; con­
Engine control unit
trols solenoid valve (waste gate)
operation
Detects intake air temperature;
Intake air thermo
sensor
sends signal to control unit
Intercooler
Reduces compressed air temperature
from turbocharger
Knock control unit
Receives knock signal from knock sen­
sor; sends signal to control unit
Knock sensor
Detects engine knocking; sends signal to
knock control unit
Controls turbocharger boost pressure ap­
Solenoid valve
(Waste gate)
plied to actuator
Pressurizes intake air utilizing exhaust
Turbocharger
gas flow
4B-50
Function
Installed in air flow meter
Integrated solenoid valve
(waste gate)
Application
New
Previous
Remarks
model
O
O
o
o
o
o
o
o
model
X
X
o
X
o
o
X
o

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Troubleshooting

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