Text in Illustration
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the camshaft timing oil control valve assembly connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY - ECM)
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: 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, 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 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 from several sensors.
The VVT controller regulates the intake 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 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.
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