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Home >> Jaguar >> 2010 >> XFR >> Repair and Diagnosis >> External Pages >> Different car >> Section 128 (Electronic Engine Controls - GTDI 2.0L Petrol -- XF/X250) >> Electronic Engine Controls - GTDI 2.0L Petrol >> Description And Operation >> Electronic Engine Controls - System Operation And Component Description (G1550549) >> Description >> Variable Camshaft Timing (VCT) Solenoid Valves

Variable Camshaft Timing (VCT) Solenoid Valves

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.
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The VCT solenoids are located in the camshaft cover at the front of the engine. Each valve is sealed in the cover with O ring seals and secured with a bolt. Both solenoids are located in the front camshaft bearing cap which has internal drillings to direct pressurized oil to the VCT actuators.

The VCT solenoid comprises an electro-magnetic valve with a spring loaded piston. Slots in the piston allow oil to be channeled to the VCT actuator. The VCT actuators rotate the inlet and exhaust camshafts to adjust the camshaft timing as required. The direction in which the camshaft is rotated is dependent on the chamber in the VCT actuator which is supplied with oil pressure from the slot in the VCT solenoid piston.

An oil filter is located in the front camshaft bearing cap to prevent contaminants affecting the function of the solenoid valves.

Each VCT solenoid receives a fused battery supply via the BJB. Operation of the solenoid valves is controlled by the ECM. The ECM provides a PWM ground for the VCT solenoid. This allows oil to be directed to different chambers in the VCT actuators at variable rates, allowing the inlet and exhaust camshaft angle positions to be controlled independently and precisely.

Each solenoid valve operates on a 12V supply at 100A and has a resistance of 7.40 Ohm ± 0.50 Ohms. The ECM can diagnose the operation of the VCT solenoids and store fault related codes. The codes can be read using a Jaguar approved diagnostic system.

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