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Variable Cam Timing Solenoid Valve

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The VCT solenoid valve is an integral part of the VCT system. See Fig 1. The solenoid valve controls the flow of engine oil in the VCT assembly. As the PCM controls the duty cycle of the solenoid valve, oil pressure/flow advances or retards the cam timing. Duty cycles near 0 or 100 percent represent rapid movement of the camshaft. Retaining a fixed camshaft position is accomplished by dithering (oscillating) the solenoid valve duty near 50 percent.

Fig 1: Identifying Variable Cam Timing Solenoid Valve
G00088436Courtesy of FORD MOTOR CO.
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