OK -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
From 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0013,P0023: Camshaft Position "B" Actuator Circuit / Open (Bank 1)
P0023 - Camshaft Position "B" Actuator Circuit / Open (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
This DTC is designed to detect an open or short in the camshaft timing oil control valve assembly circuit. If the camshaft timing oil control valve
assembly duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and set the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
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