Idle speed control valve (Renault Espace III)

The idle air control valve is a solenoid valve with a conventional winding and is designed to regulate the additional air supply to the throttle assembly to maintain the engine crankshaft speed at a level specified for all idle operating conditions.

If there is no power supply to the valve

Air channel closed, plunger (4. Fig. 2.3) shifted in the direction of the winding (3) by the spring (5). The core (2) is pressed against the valve plunger by a small spring (1).

Ignition on, engine stopped

The injection system control unit controls the valve via channel 54 (intermittent short circuit to ground)

The valve receives a signal to open 95% but remains closed because it does not receive +12V power through the fuel pump relay (the relay is controlled a few moments after the ignition is turned on and is only activated when the injection system control unit receives information about TDC).

The engine is idling

The magnetic field created by the winding moves the core, which in turn pushes the plunger.

The injection system control unit maintains the cyclic opening mode in accordance with the required air supply to ensure the required crankshaft speed at idle speed (depending on engine operating conditions).