2010 Lexus Truck RX 350 AWD V6-3.5L (2GR-FE) P Code Charts Page 104

the oil filter, thus eliminating the source of the problem.

B -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and

Repair/Removal

A -- END

From 08/2009

2GR-FE ENGINE CONTROL: SFI SYSTEM: P0014,P0015,P0024,P0025: Camshaft Position "B" - Timing Over-Advanced or System

Performance (Bank 1)

P0025 - Camshaft Position "B" - Timing Over-Retarded (Bank 2)

DESCRIPTION

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 the 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 by several sensors.

The VVT controller regulates the exhaust 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 exhaust 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 exhaust valve timing using the Variable Valve Timing (VVT) system to control the exhaust camshaft. The 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. The VVT controller can advance or retard the exhaust camshaft.

- If the difference between the target and actual exhaust valve timing is large, and changes in actual exhaust valve timing are small, the ECM

interprets this as the VVT controller stuck malfunction and sets a DTC.

- Example:

- A DTC is set when the following conditions "A" and "B" are met:

- It takes 5 seconds or more to change the valve timing by 5锟斤拷CA (Condition "A").