2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) P Code Charts Page 153

The Variable Valve Timing (VVT) system includes the ECM, camshaft timing oil control valve assembly and VVT controller. The ECM sends a

target duty-cycle control signal to the camshaft timing oil control valve assembly. This control signal regulates the oil pressure supplied to the VVT

controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and

engine coolant temperature. The ECM controls the camshaft timing oil control valve assembly, based on the signals transmitted from several sensors.

The VVT controller regulates the intake camshaft angle using oil pressure through the camshaft timing oil control valve assembly. As a result, the

relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease

under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors,

and performs feedback control. This is how the target intake valve timing is verified by the ECM.

MONITOR DESCRIPTION

The ECM optimizes the valve timing by using the Variable Valve Timing (VVT) system to control the intake camshaft. The VVT system includes

the ECM, the camshaft timing oil control valve assembly and the VVT controller.

The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve assembly. This control signal regulates the oil pressure

applied to the VVT controller. The VVT controller can advance or retard the intake camshaft. The ECM calibrates the intake valve timing by setting

the intake camshaft to the most retarded angle while the engine is idling. The ECM closes the camshaft timing oil control valve assembly to retard

the cam. The ECM stores this value as the VVT learning value. When the difference between the target and actual intake valve timing is 5锟斤拷CA

(crankshaft angle) or less, the ECM stores it.

If the VVT learning value matches the following conditions, the ECM determines the existence of a malfunction in the VVT system, and sets the

DTC.

- The VVT learning value: Less than 18.5锟斤拷CA, or more than 43.5锟斤拷CA.

- The above condition continues for 18 seconds or more.

This DTC indicates that the intake camshaft has been installed toward the crankshaft at an incorrect angle, caused by factors such as the timing chain

having jumped a tooth.

This monitor begins to run after the engine has idled for 5 minutes.