Application. The following procedures apply to the oil control valve, oil filter, or intake camshaft sprocket/actuator on any of the cylinder heads.
1. The WT system changes the intake camshaft angle to advance or retard the timing of the intake camshaft by applying oil pressure to the intake camshaft sprocket actuator. Changing the valve timing of the intake valves under certain engine operating conditions causes an increase in engine torque, a decrease in fuel consumption and a decrease in the level of harmful emissions.
2. System elements include a powertrain control module (RSM), oil control valve (OCV) in each cylinder head, an oil filter for each oil valve, and an intake camshaft sprocket assembly with an actuator.
3. The PCM uses input from the following sensors to turn the oil control valve on and off:
- A) vehicle speed sensor (VSS),
- b) throttle position sensor (TPS),
- V) mass air flow sensor (MAF),
- G) engine coolant temperature sensor (EATING).
4. When the oil control valve is activated by the PCM, it directs the prescribed oil pressure from the engine to initiate valve timing advance or lag to the intake camshaft sprocket actuator.
Ryas. 9.4. When energized, the OCV plunger (A), which you can put on through the grooves in the case, should come out; with the interruption of the supply voltage, the plunger must go inside
5. The intake camshaft sprocket/actuator assembly is equipped with an internal hub that is fixed on the camshaft. The inner hub contains a set of fixed vanes that are subjected to oil pressure to turn the camshaft. The higher the oil pressure, the faster the actuator will rotate, causing the camshaft to advance or retard. Higher oil pressure causes a change in the angular position of the camshaft by supplying oil to the advance or retard side of the fixed vanes.
6. When oil is supplied to the vanes from the advanced side, the actuator can cause the valve timing to advance. Up to 21 degrees clockwise. When the oil is supplied to the blades from the lag side, the actuator starts to rotate the camshaft counterclockwise to 0 degrees, which corresponds to the normal position of the actuator when the engine is running without load or in idle mode. In addition, the PCM can send a signal to the oil control valve to stop the oil supply to both channels (lead or lag), to maintain the valve timing advance at the current position.
7. When the engine is lightly loaded, the VVT system initiates camshaft retardation to reduce valve overlap and stabilize engine power. At medium engine loads, the VVT system initiates camshaft advance to increase valve overlap, while reducing fuel consumption and emissions. Under heavy engine loads at low revs, the VVT system initiates camshaft advance to allow the intake valves to close more quickly, resulting in increased torque in the low and mid-range revs. Under heavy engine loads in the high RPM range, the VVT system initiates camshaft retardation to slow the closing of the intake valves to increase engine power.