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Idle Speed Control (ISC) Solenoid Valve

  1. Ensure engine coolant is at normal operating temperature. With engine speed at idle, disconnect ISC solenoid connector. ISC solenoid should make a click noise and engine speed should increase to 1200 RPM. Turn engine off.
  2. Using an ohmmeter, measure resistance between ISC solenoid terminals. Resistance should be 11-13 ohms at 68°F (20°C). If resistance is not 11-13 ohms or solenoid does not function as specified, replace ISC solenoid.
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