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Home >> Ford >> 1990 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Solenoid Checks >> Idle Speed Control (ISC) By-Pass Solenoid
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Idle Speed Control (ISC) By-Pass Solenoid

  1. Ensure ignition is off. Disconnect ISC solenoid connector. Set DVOM to 200-ohm scale. Measure resistance across ISC solenoid terminals. If resistance is 7-13 ohms in one direction and higher in the opposite direction (because of diode), solenoid is okay.
  2. Set DVOM to 20 k/ohm scale. Measure resistance from either ISC solenoid terminal to ISC solenoid housing. If resistance is greater than 10 k/ohms, ISC solenoid is okay.
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