1997 Infiniti QX4FACTORY OEM SERVICE PROCEDURE

Fast Idle Control Device (FICD) System Test

  1. Start engine and warm to operating temperature. Check idle speed. See SPECIFICATIONS article. Adjust idle speed if necessary. See ADJUSTMENTS article. Turn A/C switch and blower fan switch on. Idle speed should increase. If idle speed does not increase, go to next step. If idle speed increases, system is functioning properly.
  2. Ensure A/C compressor functions normally. If compressor is not functioning, repair A/C system as necessary. If compressor is functioning, go to next step.
  3. Turn ignition (engine) off. Disconnect FICD solenoid harness connector. Start engine and let it idle. Measure voltage between ground and FICD harness connector terminal Black/White wire. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 7.5-amp fuse. If fuse is okay, repair open harness or connectors between fuse, A/C relay, and FICD solenoid.
  4. Turn ignition (engine) off. Disconnect FICD solenoid harness connector. Check continuity between ground and FICD solenoid harness connector Green/Orange wire. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open Green/Orange wire or connectors. On automatic A/C equipped models, ensure automatic A/C control unit is functioning normally.
  5. Check FICD solenoid. See FAST IDLE CONTROL DEVICE (FICD) SOLENOID. If FICD solenoid is okay, check ECM terminals, harness, and connector terminals for pushed-out, damaged, or corroded terminals. Repair or replace as necessary.
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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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