AutoZone 2009 Mercedes Benz SL550 5.5L SFI DOHC 8cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Variable Camshaft Timing Oil Control Solenoid | AutoZone.com

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    2009 Mercedes Benz SL550 5.5L SFI DOHC 8cyl

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    Lincoln LS 2000-2005

    Variable Camshaft Timing Oil Control Solenoid

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    Operation



    The VCT solenoid valve is an integral part of the VCT system. The solenoid valve controls the flow of engine oil in the VCT actuator 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% represent rapid movement of the camshaft. Retaining a fixed camshaft position is accomplished by dithering (oscillating) the solenoid valve duty cycle.

    The PCM calculates and determines the desired camshaft position. It will continually update the VCT solenoid duty cycle until the desired position is achieved. A difference between the desired and actual camshaft position represents a position error in the PCM VCT control loop. The PCM will disable the VCT and place the camshaft in a default position if a fault is detected. A related DTC will also be set when the fault is detected.

    Removal & Installation





    Click image to see an enlarged view

    Fig. Variable Camshaft Timing Oil Control Solenoid mounting

    1. Before servicing the vehicle, refer to the Precautions section.
    2.  
    3. Remove the LH or RH valve cover.
    4.  
    5. Remove the bolt and the variable camshaft timing (VCT) oil control solenoid.
    6.  
    7. To install, reverse the removal procedure. Tighten to 7 Nm (62 lb-in).
    8.  

    Testing



    1. Before servicing the vehicle, refer to the Precautions section.
    2.  
    3. With the key OFF , disconnect the VCT solenoid connector.
    4.  
    5. Measure the resistance of the VCT solenoid. Specification is 5-14 ohms.
    6.  
    7. Measure the resistance between VTC solenoid pin 1 and ground. Specification is infinite resistance.
    8.  
    9. Replace the VCT solenoid if any tests are out of specifications.

      Click image to see an enlarged view

      Fig. Variable Camshaft Timing solenoid connector

    10.  

     
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