Toyota 2GR-FE Manual page 255

DTC P0013
DTC P0023
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, 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 the
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 exhaust 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 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.
Crankshaft Position Sensor
MAF Meter
Throttle Position Sensor
ECT Sensor
Vehicle Speed Signal
Camshaft Position Sensor
DTC No.
Open or short in OCV for exhaust camshaft (bank 1)
P0013 circuit
(1 trip detection logic)
Open or short in OCV for exhaust camshaft (bank 2)
P0023 circuit
(1 trip detection logic)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Camshaft Position "B" Actuator Circuit / Open
(Bank 1)
Camshaft Position "B" Actuator Circuit / Open
(Bank 2)
DTC Detection Condition
ECM
Target Valve Timing
Feedback
Correction
Actual Valve Timing
• Open or short in OCV for exhaust camshaft (bank
1) circuit
• OCV for exhaust camshaft (bank 1)
• ECM
• Open or short in OCV for exhaust camshaft (bank
2) circuit
• OCV for exhaust camshaft (bank 2)
• ECM
ES–99
Duty Control
Camshaft Timing
Oil Control Valve
(OCV)
A103843E02
Trouble Area
ES