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Home >> Geo >> 1991 >> Prizm Base, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle-Up Vacuum Switching Valve (IVSV)

Idle-Up Vacuum Switching Valve (IVSV)

NOTE: The idle-up vacuum switching valve also may be referred to as the Idle Speed Control (ISC) solenoid.
  1. The IVSV is located on end of intake manifold on Prizm or below mass airflow sensor on Prizm GSi. The IVSV by-passes air into intake manifold on Prizm or around throttle valve of mass airflow sensor on Prizm GSi when it is activated by ECM.
  2. The IVSV is energized whenever idle speed drops to less than desired RPM due to engine load (i.e. electrical, P/S, A/T in Drive, etc.). No other information is available from manufacturer.
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