The primary CRS components are shown in the figure below.
The supply pump is equipped with an SV1 type suction control valve (SCV). The connector has changed from the conventional perpendicular type to a horizontal type.
When the energization time is long, the average current flowing to the solenoid is large.
As a result, the needle valve is pushed out (in the compact SCV, the needle valve is pulled), creating a large valve opening.
Subsequently, the fuel suction quantity increases.
When the energization time is short, the average current flowing through the solenoid is small.
As a result, the needle valve is returned to the original position by spring force, creating a small valve opening. Subsequently, the fuel suction quantity decreases.
The 2AD-FTV, 2AD-FTV, and 1AD-FTV are equipped with a pressure discharge valve.
Therefore, the appropriate engine ECU control and actuation circuit (EDU) has been designated to control the pressure discharge valve.
The rail pressure sensor detects fuel pressure within the rail and sends pressure signals to the ECU.
The rail pressure sensor is a Piezo resistance type semiconductor pressure sensor that uses the pressure added to a metal diaphragm, and the accompanying changes in electrical resistance to detect rail pressure.
As a backup during a failure, the rail pressure sensor has redundant systems for output voltage.
The output characteristics for the 2005 model year have been changed.
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