Idle Control Valve

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 the S62 engine is the three wire ZWD 5 system.

The valve has two 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 (30%) 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). The MS S52 control module can progressively open the valve to allow limited operation of the engine.