Idle Control Valve

The S62 engine uses an idle control valve for idle stabilization. During idle conditions, the throttle valves are closed and all idle air passes through the idle valve. The valve on S62 engine is 3-wire ZWD 5 system. The valve has 2 windings that oppose each other. By varying the duty cycle applied to the windings, the valve can be progressively opened, closed or held steady to maintain the idle at a specified speed. The valve has a mechanical fail-safe opening of 30 percent which will allow the engine to idle in the event of a malfunction with the control of the valve. The idle control valve also serves as a fail-safe in the event of certain faults with the throttle control system (EDR). MS S52 control module can progressively open the valve to allow limited operation of the engine.