Idle Speed Control

ECM controls engine idle speed according to engine operating conditions and component/model application. ECM will send a signal to adjust and compensate for idle speed under the following conditions: from starting to 20 seconds after start, low battery voltage, engine overheating, electrical load, A/C on, power steering load, during deceleration and when vehicle is moving at idle.

Idle speed control is achieved using various components. Models are equipped as follows:

• Except Sentra 2.0L
  
  IAC Valve, IACV-FICD, Fast Idle Cam
• Sentra 2.0L
  
  IAC Valve, IACV-Air Regulator, IACV-FICD