Xterra SE 2WD V6-3.3L (VG33E) (2002)
Boost Solenoid: Description and Operation
SYSTEM DESCRIPTION
This system controls supercharged air according to the engine operating conditions.
This control operation is accomplished through the ECM and the SCB valve control solenoid valve.
When the solenoid valve is ON, the SCB valve shuts. Then intake air is lead to supercharger, and supercharged air is sent to the cylinder.
When the solenoid valve is OFF, the SCB valve opens. Then intake air is sent to the cylinder directly.
When the ECM detects any of the following conditions, current does not flow through the solenoid valve.
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Engine stopped
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Engine starting
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High-load, high-speed engine operation
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Excessively low engine coolant temperature
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Mass air flow sensor malfunction
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Engine coolant temperature sensor malfunction
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Throttle position sensor malfunction