Toyota 2GR-FE Manual page 243

DTC P0010
DTC P0020
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, Oil Control Valve (OCV) and VVT controller.
The ECM sends a target duty-cycle control signal to the OCV. 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 OCV, based on the signals transmitted by several sensors. The VVT controller
regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions
of the camshaft and crankshaft are optimized, the engine torque and fuel economy improves, 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.
Crankshaft Position Sensor
MAF Meter
Throttle Position Sensor
ECT Sensor
Vehicle Speed Signal
Camshaft Position Sensor
DTC No.
Open or short in OCV for intake camshaft (bank 1)
P0010 circuit
(1 trip detection logic)
Open or short in OCV for intake camshaft (bank 2)
P0020 circuit
(1 trip detection logic)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Camshaft Position "A" Actuator Circuit (Bank
1)
Camshaft Position "A" Actuator Circuit (Bank
2)
DTC Detection Condition
ECM
Target Valve Timing
Feedback
Correction
Actual Valve Timing
• Open or short in OCV for intake camshaft (bank 1)
circuit
• OCV for intake camshaft (bank 1)
• ECM
• Open or short in OCV for intake camshaft (bank 2)
circuit
• OCV for intake camshaft (bank 2)
• ECM
ES–87
Duty Control
Camshaft Timing
Oil Control Valve
(OCV)
A103843E02
Trouble Area
ES