Nissan 240SX/Altima 1993-1998 Repair Guide

Idle Air Control Valve-FICD Solenoid Valve

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OPERATION



When the air conditioner is operating, the Idle Air Control Valve (IACV)-FICD solenoid valve opens to allow additional air into the engine. This will increase the idle speed to compensate for the increased load placed on the engine by the air conditioner compressor.

TESTING



See Figures 1, 2 and 3



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Fig. Fig. 1: IACV-FICD valve connector's testing terminal locations for 1995-96 240SX models. Other years of the 240SX use a two-terminal connector



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Fig. Fig. 2: IACV-FICD valve connector's testing terminal locations-Altima



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Fig. Fig. 3: Exploded view of the IACV-FICD valve

  1. Disconnect the electrical harness from the valve.
  2.  
  3. Supply battery voltage and ground to the solenoid.
  4.  

Voltage connections for Altima and 1995-96 240SX models are illustrated. All other 240SX vehicles use a 2-terminal connector.

  1. Interrupt the circuit, then reconnect it and repeat the cycle several times. A distinct clicking noise should be heard, as battery voltage is applied and removed.
  2.  
  3. If clicking noise is not heard, remove the valve and inspect the plunger for seizing or sticking. Also inspect the spring.
  4.  
  5. If the solenoid does not function as specified, inspect the circuits back to the ECM.
  6.  

REMOVAL & INSTALLATION



The idle air control valve is located on the underside of the intake manifold.

  1. Disconnect the electrical harness from the valve.
  2.  
  3. Unscrew the valve from the IACV assembly.
  4.  

To install:
  1. Check the valve for clogging and ensure that the spring has tension.
  2.  
  3. Screw the valve into the IACV assembly. Tighten it securely.
  4.  
  5. Connect the electrical harness to the valve.
  6.  

 
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