Question about 2004 Hyundai Elantra
The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. This system helps the engine decrease exhaust gases and increase engine power and fuel economy by changing the valve open/close timing of the intake camshaft. The deviation of the camshaft position from the target point is evaluated during stable driving condition. The PCM accumulates this deviation for a certain period and sets DTC P0010 when the accumulated deviation is too high. The target camshaft position is a predetermineded value depending on engine speed and throttle angle communicated to the PCM. The MOST FREQUENT CAUSE is DIRTY OIL. The NEXT most frequent cause is restriction/obstruction of OIL FLOW to the CVVT unit (oil control valve supplies this). Remove this valve & inspect it for aluminium flashing (bits of metal which might be interferring with the valve's operation). We use Z-MAX treatment to solve this problem at our service center (after changing oil & filter (genuine Hyundai Oil Filter).
Posted on Jun 17, 2009
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Posted on Jan 02, 2017
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