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Home >> Infiniti >> 1990 >> M30 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Auxiliary Air Control (AAC) Solenoid Check
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Auxiliary Air Control (AAC) Solenoid Check

  1. Warm engine to operating temperature. Place transmission in Neutral. Ensure idle speed is adjusted to specification. If not, adjust before proceeding. See ADJUSTMENTS article. If idle speed cannot be adjusted, check idle speed screw passage for blockage.
  2. With engine idling at specified RPM, disconnect AAC solenoid connector. RPM should drop. If RPM drops, AAC is functioning correctly.
  3. If RPM does not drop, turn ignition off. Disconnect electrical connector from AAC solenoid. Using ohmmeter, ensure resistance of solenoid windings is 10 ohms. Remove AAC valve and check for plunger seizing or sticking. Check for broken tension spring. If no faults are found, check AAC power and ground circuits. Check ECU input signals used to control AAC solenoid.
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