Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Tundra 2000-2006 Approved 04-06 techinfo.toyota.com ileaf 06toyrm 06toypdf 06rmsrc 06tundra di eg2uzfe cip0016p

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DI-504
                                                 DIAGNOSTICS        -   ENGINE (2UZ-FE)
                                                                                                                     DIDR9-01




    DTC               P0016                Crankshaft Position - Camshaft Position
                                           Correlation (Bank 1 Sensor A)


    DTC               P0018                Crankshaft Position - Camshaft Position
                                           Correlation (Bank 2 Sensor A)

CIRCUIT DESCRIPTION
VVT sensor (VVL or VVR signal) consist of a signal plate and pickup coil.
The VVL or VVR signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control
the intake valve timing in response to during condition.
   DTC No.                      DTC Detecting Condition                                               Trouble Area
             No VVT sensor signal to ECM during cranking at 4 sec. or
             more
                                                                             S Open or short in VVT sensor circuit
   P0016     No VVT sensor signal to ECM with 5 sec. or more engine
                                                                             S VVT sensor
   P0018     speed 600 rpm or more
                                                                             S ECM
             While the crankshaft rotates twice, VVT sensor signal will be
             input to ECM 5 times


MONITOR DESCRIPTION
The ECM optimizes the valve timing using the VVT (Variable Valve Timing) system to control the intake valve
camshaft. The VVT system includes the ECM, the OCV (Oil Control Valve) and the VVT controller. The ECM
sends a target duty-cycle control signal to the OCV. This control signal, applied to the OCV, regulates the
oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve cam-
shaft. The ECM calibrates the valve timing of the VVT system by setting the camshaft to the maximum retard
angle when the engine is idle. The ECM closes the OCV to retard the cam. The ECM stores this value as
VVT learning value (When the difference between the target valve timing and the actual valve timing is 5
degrees or less, the ECM stores this in its memory.).
If the learning value meets both of the following conditions ((a) and (b)), the ECM interprets this as a defect
in the VVT system and sets a DTC.
(a) VVT learning value is less than 20

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