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Home >> Ford >> 1993 >> Festiva GL, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Speed Control By-Pass Air (ISC-BPA) Valve
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Idle Speed Control By-Pass Air (ISC-BPA) Valve

  1. Remove ISC-BPA valve from engine. Connect a hose from a hot water tap to coolant inlet nipple on ISC-BPA valve. Blow through valve air port. Note resistance to airflow.
  2. Supply hot water to ISC-BPA valve. Blow through valve again. If resistance to airflow does not increase when valve is hot, replace ISC-BPA valve.
  3. Apply 12 volts to solenoid terminals. If solenoid does not click, replace ISC-BPA valve. Measure resistance across IAC terminals. If resistance is not 6-14 ohms, replace ISC-BPA valve.
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