Turn ignition switch OFF.
Remove the air duct.
(Refer to Engine Mechanical System - "Air cleaner")
Disconnect the solenoid valve connector (A).
Measure resistance between sensor signal terminal and sensor ground terminal.
Check that the resistance is within the specification.
Replacing an on/off solenoid valve (SS-A, SS-B) does not require additional hydraulic pressure adjustment; however, the hydraulic pressure will need to be adjusted after replacing the VFS solenoid valve. If replacing the VFS solenoid valve; also replace the valve body assembly.
(Refer to Hydraulic System - "Valve Body")