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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Fast Idle Control Device (FICD) System Test (Quest)
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Fast Idle Control Device (FICD) System Test (Quest)

  1. Start engine and warm to operating temperature. Check idle speed. See SPECIFICATIONS article. Adjust idle speed if necessary. See ADJUSTMENTS article. Turn air conditioning and blower fan switches 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 is functioning. If compressor is not functioning, repair air conditioner system as necessary. If compressor is functioning, turn ignition off. Disconnect FICD relay. Relay is located in relay box on right front inner fender rail.
  3. Turn ignition on. Measure voltage between ground and FICD relay harness connector terminals No. 2 (Blue wire) and No. 5 (Blue wire). For connector identification, see Figure . Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 10-amp fuse located in main fuse box under left side of instrument panel. If fuse is okay, repair open in harness between fuse and FICD relay.
  4. Turn ignition off. Disconnect FICD solenoid harness connector. Check continuity between ground and FICD solenoid harness connector Black wire. Check continuity between FICD solenoid harness connector Blue/Yellow wire and FICD relay harness connector terminal No. 3 (Blue/Yellow wire). Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Blue/Yellow wire or connectors.
  5. Turn ignition on. Measure voltage between ground and FICD relay harness connector terminal No. 1 (White/Red wire). With air conditioner switch on and fan switch in any position except off, less than 2.3 volts should be present. With air conditioning switch off, 7-9 volts should be present. If voltage is as specified, go to next step. If voltage is not as specified, repair open in White/Red wire between FICD relay harness connector and air conditioner system.
  6. Check FICD relay. See RELAYS under RELAYS & SOLENOIDS  . If relay is okay, check FICD solenoid. See FAST IDLE CONTROL DEVICE (FICD) TEST. If FICD solenoid is okay, check ECM and ECM harness connector terminal No. 41 (White/Red wire) for correct installation, damage or corrosion. Repair or replace as necessary.
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