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Home >> Lexus >> 1994 >> SC 400 V8-4.0L (1UZ-FE) >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Exhaust Gas Recirculation >> EGR Control Solenoid >> Description and Operation
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EGR Control Solenoid: Description and Operation


PURPOSE
The Exhaust Gas Recirculation (EGR) Vacuum Switching Valve (VSV) controls the regulated vacuum applied to the EGR Valve. The Engine Control Module (ECM) uses the VSV to prevent EGR operation when the engine is cold to improve driveability.

OPERATION
The VSV receives voltage whenever the ignition switch is turned ON. When EGR is required, the ECM grounds the remaining terminal which opens the VSV vacuum passage allowing vacuum to the EGR Valve.



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