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Home >> Nissan-Datsun >> 1995 >> 240SX Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 2.4L >> Idle Control Systems >> Fast Idle Control Device (FICD) System Test
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Fast Idle Control Device (FICD) System Test

  1. Start engine and warm to operating temperature. Check idle speed. See the SPECIFICATIONS article. Adjust idle speed if necessary. See the 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 air conditioner compressor functions normally. If compressor is not functioning, repair air conditioner system as necessary. If compressor is functioning, go to next step.
  3. Turn ignition (engine) off. Disconnect FICD solenoid sub-harness connector. Start engine and let it idle. Measure voltage between ground and FICD sub-harness connector terminal Blue/Red (or Red) wire. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, repair open harness or connectors between fuse, A/C relay, and FICD solenoid.
  4. Turn ignition off. Disconnect FICD solenoid sub-harness connector. Check continuity between ground and FICD solenoid sub-harness connector Black wire. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, check diode and ambient switch or repair open Black wire or connectors.
  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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