Toyota Avalon V6-3.5L (2GR-FE) Diagnostic Trouble Codes ( DTC ): P Code Page 1
A L L Diagnostic Trouble Codes ( DTC ): P Code Charts
Engine Control System - SFI System (to 12/2010)
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0010, P0020: Camshaft Position "A" Actuator Circuit (Bank 1)
P0020 - Camshaft Position "A" Actuator Circuit (Bank 2)
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 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
After the ECM sends the "target" duty-cycle signal to the OCV, the ECM monitors the OCV current to establish an "actual" duty-cycle. The ECM
detects a malfunction and sets a DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
No comments:
Post a Comment