1990 Infiniti M30FACTORY OEM SERVICE PROCEDURE

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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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